Thursday, April 8, 2010

247 frame numbers


Version 180 cubes
DATEFRAME NMODIFIED ELEMENTS
Jul. 196821M 0Cota 247 First mass-produced.
Mar. 196821M 500Frame with "ears" rear fender supports New chain guide modified exhaust tube New tube coat mouth with two asparagus intake air filter modified box (3 screws)
Nov. 196821M 1191Chain Guide

Version 110 cubes
DATEFRAME NMODIFIED ELEMENTS
Abr. 197021M 1800New Saw New stirrups deposit cap O-ring modified wheel hubs Saddle 110 mm. Duralumin sprocket
Oct. 197021M 2505Duralumin Bridas front suspension

Version gray box. New motor
DATEFRAME NMODIFIED ELEMENTS
Mar. 197121M 3000Fij. elastic ring back cushion frame New Color New forged lower brackets. New Redesigned petrol tap New Group stock front suspension-cylinder 'round' round exit Escape inertia and magnetic flywheels New air filter New upper intake
Mar. 197121M 3125Polished wheel hubs
Mar. 197121M 3372New start-up gear
Jun. 197121M 3750New handle grips knurled design New rear brake cylinder new design shirt carters Change Piñon improved control sprocket wheel modified New start New gear shift "round"
Jul. 197121M 3789New piston
Jul. 197121M 3825Shocks "golden" without dust
Sep. 197121M 4382New chain tensioner new plastic chain guard.
Sep. 197121M 4456Fixation with asparagus stock
Feb. 197221M 5394Piñon scroll wheel control

Version stylish tank
DATEFRAME NMODIFIED ELEMENTS
Jul. 197221M 6600New rear fork easel articles on New Deposit stylized manillar.Fuelles Positioner suspension. New front throttle. New rear brake lever New fixation, on exhaust and muffler additional light is included "stop" and city. New Game clutch plates "cut"
Jul.197221M 6700Supplement carburetor silencer sizing improved. Piñon control wheel 10 teeth

Leftward shift
DATEFRAME NMODIFIED ELEMENTS
December 197221M 8100Change left springs New fuel tap New New Edit plunger segments. air filter cover. New pem more separate lever.
May. 197321M 9702Change rear tire
Aug. 197321M 11,001Incorporates end shifters on handlebars direction incorporates audible Duralumin
Sep. 197321M 11,152Incorporation of rubber anti-vibration in the cylinder and cylinder head.
Sep. 197321M 11,240New Pirelli rear cover
Oct. 197321M 12,115Filter element, "Twin-air"

Black frame version
DATEFRAME NMODIFIED ELEMENTS
Feb. 197421M 13,107New black frame. Patin improved chain guide new rubber fuel tap
Feb. 197421M 13,291Carburetor with purge in Cuba.

Cota 247 T
DATEFRAME NMODIFIED ELEMENTS
Abr. 197421M 13,830First 247 Trail. Tandem Saddle
December 197421M 17,218Natural rubber grips New front tire

Version Ulf Karlson
DATEFRAME NMODIFIED ELEMENTS
Jun. 197521M 19,228Ulf Karlson tank protectors are added throttle levers, clutch carters.Palanca Redesigned New pipe plug on carters New pem forged lever

Cota 247 T
DATEFRAME NMODIFIED ELEMENTS
Aug. 197521M 19,779UK-based Trail version.
Jul. 197521M 19,872Foodborne new relationship. primary.
Jul. 197521M 19,979Duralumin chain tensioners
Sep. 197521M 20,042Step electrical cables on guard.trasero
Feb. 197621M 21,318Fij caps. duralumin handlebars
Feb. 197621M 21,381Rubber guard is added carburetor.

Cota 247 T
DATEFRAME NMODIFIED ELEMENTS
May. 197621M 21,482New decoration red stickers.
Sep. 197621M 21,962Bearing Nylon Cage steering handlebar dural
Oct. 197621M 22,062New seat
Mar. 197721M 23,035New fuel tap
Jul. 197721M 23,635Engine 237 cc (71x60) New French standard syst. aire.Nueva filter susp. Betor rear springs variable.Manguito step between flanges, tubes susp. New hard chrome rear registration plate.

Cota 247 C
DATEFRAME NMODIFIED ELEMENTS
Jun. 197821M 25,137Displacement 237 cc (Standard French) New tank New front suspension air pressure plastic fenders

Cota 247 (two seater)
DATEFRAME NMODIFIED ELEMENTS
Jul. 197821M 25,307Gas tank. "Type 348" tandem.
14 Oct. 198021M 27,337Last Cota 247 mounted

348 frame numbers


FRAME NMODIFIED ELEMENTS
51M 0000First mass-produced Cota 348
3132Change in filter housing is added deflator antiwater screen.
3699Step is added chain guard on engine crankcase forwarding Change speedometer.
3790Change elements of the carburetor
4722New front fender
5059The 3rd gear on the output shaft speed from 15 to 16 teeth, to shorten development
5099Amending the bottom flange of the suspension. to open a passage for cables
5707Improved softness gearshift freewheel is amended and the sliding
6828Support the chain guide diam. fixing holes of the ducts reducidos.Los spacers are fixed. The aim is to prevent wear of the support
7200New dampers susp. back "Telesco Hydrobag" gas improved front suspension, resulting in a more progressive brake strut is changed and the new spring brake and clutch controls protective Eccentric chain tensioning step further reduced
10,107New rubber grips on handlebars
11,307New decoration deposit, with gold and black line New fixing system by roller and rocker gear, which ensures the positioning of these new levers for change and new rear brake rigid optic headlight New flywheel New front suspension with air pressure suspension arm protector
12,305Shocks susp. modified rear

348 carb


I recommend staying with the Amal mk2 on the Cota 348, unless there 
is no change after replacing the needle, needle jet, slide etc.  I 
have found that there are just bad Amals (casting flaws?) and no 
amount of time and parts will fix them.  If going the Mikuni route, 
here is a tried and true setup that has worked.


VM 26mm. main jet--115 pilot jet--30 needle jet--0-2 needle--5F21 slide--1.0
Set for altitude of 1500 ft.
                                      
Regards, Jared                                       
www.southwestmontesa.com

project: 247

Well, I've decided to forget the 348/349 hybrid project…..not AHRMA legal. 'Nuff said! Instead, I'm in the process of getting this "almost like new" Cota 247. The owner is shipping it to me, and hopefully I'll receive it soon. It should make a great winter project!! I plan on stripping it, and building it back up. Spending too much money I'm sure of, in the process. If any body has any tips on working on the 247's, let me know. I'm going to finish the 348 that I own (making sure to have it ready for AHRMA 2000), and then I'll start on the 247.

My goal is to finish it well before the beginning of the new trials season. I think I should be able to do that!! I know the bike looks rough, but I'm also getting some extra parts. I'll try to cover the rebuild here, from start to finish. This should make an interesting motorcycle and it should also make a good "back-up" bike incase my 348 breaks down.

Let me know what you think of the project, and help me out if you have any parts for sale that would fit this bike. As soon as I receive the bike, I'll make my first posting on the start of the project.

part 2:
Well I just received my first box of 247 Cota parts. I opened the box, and found a very well used gas tank, a pair of handlebars, a set of original shocks, and two exhaust pipes. One of the pipes has the exhaust tip cut off of it, but the other one is complete. Both header pipes on each one was in very good shape. I went to the buffer with these, and was able to really buff these up. That's one thing I really like about the 247's…..those polished header pipes look GREAT!! If any one out there has a parts manual for this bike, and would like to make a copy for me, I would greatly appreciate it. I would even be willing to make some copies of whatever 348/349 stuff I have. The previous owner of this 247 is supposed to send out another box of parts on Fri. 12/10, so I should receive the next box on Tues. or Wed. The gas tank will have to be stripped down, and re-glassed in areas.

part 3:
I received my next set of parts the day before Christmas Eve. What an early Christmas present (to my self, of course)!!!! I opened both boxes and found a hoard of parts. After inventory, I had received the following parts: one complete 247 engine, a set of forks, triple clamps, front and rear axles, clutch lever and cable, a 27mm Amal carb, a rear wheel (large brake hub), a decent rear sprocket, and a very well used (more so than the last ) gas tank w/ seat base. I should get the other engine, frame, and front wheel this week.

Here is a little history on our project bike. This was taken from Jared Bates' Southwest Montesawebsite (Montesa of the Month). You should all go check out his page and his specials of the month. We are all going to need to get our bikes ready for the new season, …...so drop Jared a line to get those parts for your Cota!!! Also check out the History of Montesa and the Clymer Service Manual (1965-1974) at Jared's.

Early in 1967, two trials prototypes, based upon the Cappra 250 motocrosser were built. These were the Mk 1's and while not very successful, they did serve as a starting point for further Cota development. 65 Rayer Replica's (Mk 2's) were built in Oct-Nov of 67', changes included: 5 speed gearbox, softer clutch, alloy rims, 1.5 gal fuel tank, squish band cylinder head, and improved ignition coil. In December of 1967, Don Smith had been asked to test the new Cota in an effort to sort out the new model in time for the 1968 SSDT. Later in the year, Don Smith signed a contract and began preparations for the Scottish. Only four Montesa's were entered as compared to 82 Bultaco's and 5 Ossa's. Even with shifting problems, Smith finished sixth overall. Following this, the Mk 3's went on sale. Following a very short production run, the Mk 4's were released (late 1970) changes included, smaller wheel hubs, more ground clearance, and many other detail changes.
The above bike is owned by Phil Harvey, and was restored by Phil. The engine was built by S/W Montesa, which also supplied many of the parts Phil needed for his beautiful restoration.

Gordon Farley on a Mk3 at the 1969 Scott Trial. Farley's works bike was usually fitted with much smaller and lighter wheel hubs from the Montesa moped model. For the Scott trial, which was a speed oriented event, he reverted back to the larger and more powerful standard front brake hub, but retained the smaller rear unit.

part 4:
Some of you may already know that I have been working on the first 247 Motor. I have had great difficulty getting the flywheel off, and I have yet to complete the job. I have been successful in stripping the treads off of my flywheel puller, and stressing myself out. I am still awaiting the rest of my parts, and I will keep everyone posted on my progress. I've decided to turn my attention to my 348, so as to get it ready for competition. The AHRMA trials meet at Casey (20 miles east of my house) is in April, and I want to be fully prepared to have some FUN, by then.

part 5:
Well it's been a while since I last updated this,….so that means I've had plenty of time to be outside in the garage working on the 247. I stripped the extra engine down, and found a disintegrated lower end and a missing piston. The "good" engine had a stripped shift shaft, so I took the one out of the extra engine. This meant that I had to split the case on the good engine. As you may remember, I had yet to get the stubborn mag off of the "good" engine. The mag on the bad engine practically fell off, but I guess my hours of persistence paid off and the mag finally broke loose on the "good" engine.
I got everything stripped down, cleaned, the new shaft installed, and everything buttoned back. I was getting stoked about getting the thing running, but first I had to clean the carb. It had nasty deposits in the float bowl so I set to cleaning and scrapping on it and……….POP!!…..there sudenly appears a hole in the bottom of the bowl. I guess someone had patched it before, and I pushed their patching material out. Well not going to get it started today!!
The next day I patched the float bowl, and let it set up. Then I got the carb bolted on and tried to fire her up!! I've got a spark, but it just won't go. I found a new plug, just in case the plug was firing intermittently. Sure enough…….next try and …………….PUTT, PUTT, PUTT!!!!
I decided to strip the frame and get it ready to paint, now that I know that it runs. I have since gotten the frame painted white, and started reassembly. I've decided not to go crazy with a period restoration for now. I'm just going to get it presentable for now...and ride it a little. I'm going to get another 247 from Erwin Roman (pictured below), and hopefully I can make some of my missing parts by looking at his 247, and maybe I can get another early 247 pieced together.
BTW, this project sparked a message from Lonnie Ortiz. Lonnie also has a '70 247 and has been looking for a cylinder for his bike for some time. I sent him my extra cylinder, and he said he would send pictures after he gets it going. Lonnie sounds excited about getting his Cota going……..CAN YOU REALLY BLAME HIM????? I didn't think so!!!

I'll get pictures of the updated Project 247 soon, and in the mean time I will be fixing various small problems, such as a cracked header pipe, worn out shocks, and a nasty gas tank, not to mention sourcing some missing parts such as a kickstarter, shifter, and some fenders. Stay tuned………………….

part 6:
Well, I ordered some alloy fenders , a new set of Sammy Miller handlebars, and a new front fender mount, all from Speed and Sport. The fenders (made by Sammy Miller, I believe) were a great fit, with the exception of some minor trimming. I ended up cutting off about 3 inches in length, and cutting a little out of the rear fender for chain clearance. I would highly recommend these fenders to anyone who is looking for a replacement for those "classic" looking Montesa fenders. The front fender mount was just as good. It is a black welded steel unit that is very stout!! I got ready to enlarge the fender mount holes, and I thought I was going to destroy my drill bit in the process. It turned out fine, and I have since ordered one for my 348. Speed and Sport lists the fender mount as a 247 item, but I tried it out on my 348, and it fit. In my opinion, this mount would ad considerable strength and rigidity to the front end of the Montesa's. I ordered all new cables from Rocky Mountain Montesa, and John was more than kind, in our dealings. The early Cota parts seem a little pricey, but there it probably no way around this. I had my bike all ready minus a good gas tank. That's when Erwin Roman said he would go ahead and send me the '70 gas tank he had, along with some various parts, I still needed (shifter, correct kickstarter, cable adjusters, etc.). I received the tank, and basically just set it on the pick, filled it up with gas, and started the Cota up!! The bike runs great, and I like the way it feels. It's not as maneuverable or torquey as my 348, but hey..there was a lot of development in between those two bikes. I can't get used to the left side brake- IN THE WOODS, and I don't think I want to switch back and forth between the 247 and 348. I'm content with riding the 247 on easy trails, and around the yard. It's a great bike, that has GREAT looks!! I THINK I'll keep in in my growing collection of Montesa's ….OF COURSE I WILL!!!






"works" montesa cota

Jared Bates recently sent me some interesting photos of a couple of factory riders' bikes. I had asked him about whether or not Montesa had made "works" bikes. He responded with:

There were no real "works" 247's to speak of. Different barrels and things were tried, but the bikes always looked stock. The 348 works bikes were a different matter! Enclosed is a picture of Francisco Paya with his prototype 348 in Feb of 1974, with different cylinder, head, and carb, also right side shift and exhaust exiting like the regular 247. The rest of the bike was all 247. The other picture is of Malcolm Rathmell's works bike in May of 1975, which bears more of a likeness to the 348 as we know it. Note the offset handlebars and right side shift that Rathmell always used. Also, it still retains the 247 gas tank and older mk1 Amal carb.

on the subject of works bikes

Mark Thurman (COTA owner) e-mailed me and told me about the cylinder on his 247.  The cylinder has reed induction and appears to have a home made reed block.  The reeds sit vertical instead of horizontal like on most bikes.  Curt Comer had told  Mark that a man in Birmingham, AL used to do this modification.  But he wasn't sure.  Mark's bike also has a Mikuni carb.

I have since tried to contact Mark and Curt to try and get photos of this mod.  I'll do the best I can to try and locate the source of this  rare find.  If anyone has any information on this, or knows the individual who used to modify the Cota's, please e-mail me.


!Update!:  Mark wrote and said he was waiting on a set of rings, and that he would let us know how the bike ran with the reed.  Stay tuned for info. and hopefully pictures.  As for Curt he wrote and said he was in the process of moving, but he will be sure to find us some interesting photos and stories for the page.  He said, briefly, that Montesa messed with a reed valve, but the Cota's were already good enough!!  He also mentioned a supercharger that the factory experimented with on a Cota.  More on that and much more………….. later.

how to start an old montesa

by John R. Haberbosch
I was reading through an old owners manual for my first motorcycle for the 10th or 20th time and on crossing the title “STARTING SYSTEM” I noticed how simplistic it was. It simply stated, “It is started by means of the kick-start pedal”. There is some history here. It lacks a great deal of explanation covering how to choke the carburetor, how to tickle it, (the carburetor that is) how to swiftly stroke the kick crank, and how many times it must be stroked.
Unlike modern day motorcycles that require little in the way of understanding the starting principle with all of their electronic black boxes and foolproof carburetion, the Spanish motorcycle needs understanding and the proper gentle touch to bring life to its cold and unclearcoated aluminum heart. This happens to be one of the endearing qualities for which we become attached to our Spanish mount. The Spanish Amal monobloc carburetor was one of the most endearing.
First of all there is no need to turn on the key as the ignition is on all the time anyway. The fuel taps must be turned on prior to touching the engine. If you have left the fuel taps on for a notable period of time it will not be necessary to flood the carburetor or to choke it as frequently there is already sufficient fuel in the engine for a rich mixture. It may have more than the 1:15 fuel/air ratio and brings on a condition called “wet sumping” which will not be covered here, as it requires additional preparation time in the starting procedure that is another endearing quality for which this missive shall not delve into.
Now that the fuel taps have been opened it is necessary to flood the carburetor by depressing the “tickler” button on top of the float chamber, which is positioned off-center to left of the main jet. This must be held down until a fuel/oil mixture bubbles up around the button and down onto the polished aluminum cases which will soon attract dust to the oil left from the fuel evaporation. The “choke” lever is activated to full or slightly above full on position. The transmission is now placed into neutral and the clutch lever released. If you don’t release the clutch lever the next step may be painful. Depress the kick-start pedal swiftly downward. When the engine starts adjust the throttle position, the choke control, and the “tickler” to maintain a running condition.
If a over rich mixture causes the engine to not start and operate in an acceptable manner it is necessary to deal with a flooded condition. With the old Spanish Amal monobloc it was sometime necessary to find a moderate downhill, or strong friend, twist the throttle to full open, and engage LOW gear after reaching 5 to 10 mph. Amal’s tended to load up (flood) you see.
The other way was to turn the fuel taps off, hold the throttle wide open and kick until much smoke and many intermittent explosions signaled life. At this point the motorcycle must be leaned onto its left side so fuel would flow away from the main jet. Once the engine cleaned out simply right the motorcycle and turn the fuel taps back on.
Oh yes! Occasionally it would start on the first or second kick, which would tend to confuse you. Don’t you miss those days? You can go out to your garage and relive those days or just put a round slide Mikuni on it and just forget about it.