June 16, 201610 yr Hi Larry 2, The clutch issue can be resolved with some file work on the plate edges where they are upset, then a bit of rust removal & they should be OK to go with. The primary chain appears quite loose & no apparent tensioner as in later 5 speeds so probably needs replaced.(I'm not 4 speed knowledgeable) As to the nut on primary flywheel; I don't know but would assume RH thread, I will call our source today to find out for sure, I always use air impact to get things loose. E-mail if you want. Have a good day Larry
June 16, 201610 yr Thanks for that Larry, a man after my own heart! I always like to refurbish stuff if I can. I'll get to work on the plates. I've removed the cylinder head and barrel so I may be able to jam the crank to get a turn on the nut. I'll keep you posted. Larry 2.
June 23, 201610 yr Guys, Another question coming up! Do these marks on the piston mean standard or oversize? Larry 2.
June 26, 201610 yr Having bought and sold Mahle pistons for Bultaco's in a previous life time, they usually came marked with 0.25, 0.50, 0.75 and 1.00 on the crown of the piston to indicate oversized. Based on that, your piston appears to be Standard and not oversized. However I would like to see a photo of the complete crown (top) of the piston just to be certain. Edited June 26, 201610 yr by model80
June 27, 201610 yr Thanks Model80 and Bondy, There are no other marks on the piston that I can see but I'll put up a pic anyway. If the piston is std I think new rings should do as there's very little wear on the cylinder. But I still have to establish that. Larry 2.
June 30, 201610 yr Model 80, Here's a pic of the piston top. As you can see there's no further markings. Larry 2.
June 30, 201610 yr Hi Larry2 It looks to me that you have a standard piston there. Have you removed one of the rings and inserted it into the bore, so as to check out the gap in the ring with a feeler guage? Edited June 30, 201610 yr by model80
July 1, 201610 yr Model 80, No haven't tried that but I'll do it and see what I get. Trouble is if there's a bit of wear in the cylinder and on the ring, then the gap may not make me any wiser. Anyway, what gap should I expect? Thanks for the response, Larry 2.
July 23, 201610 yr Hello guys, Just a small update. Got the tank back from the spray shop. I think it looks pretty good. I have to apply the decals but forgot to measure the exact location, Doh! I will try to estimate from my photos. I also refurbished the casings. Re. clutch pressure adjustment, I see elsewhere that it seems like trial and error is the order of the day. Any views? Larry 2.
July 23, 201610 yr Larry, looking really good!! The clutch adjustment that I use on 5 speeds (no experience w/4speeds) is adjust all the slack available @ the lever, adjust the clutch @ the engine to a light "no slack" then back off 1/4 turn or a little more, 1/2 turn max, lock it down & adjust @ the lever to a bit of clearance this hopefully will have you in good shape, fill in proper amount of Dexron ATF & let her rip. Have a good day Larry
July 25, 201610 yr Thanks Larry, Good to have that info. Still quite a way to go but all this help will finally come good! Larry2
July 26, 201610 yr Model 80, No haven't tried that but I'll do it and see what I get. Trouble is if there's a bit of wear in the cylinder and on the ring, then the gap may not make me any wiser. Anyway, what gap should I expect? Thanks for the response, Larry 2. Hi Larry Apologies for not getting back sooner. I have a notebook with all this info, bore size tolerences, ring gaps, etc and do you think I can find it! I've tore the garage apart looking for it and can't locate it, I wouldn't mind some of the information was written up over 30 years ago when I used to work with an old gent who spent his day boring barrells and truing cranks shafts. Will keep looking. Your paint and polishing jobs have truned out really nice. You're spot on about the clutch adjustment its trial and error, followed by refined adjustments. Edited July 26, 201610 yr by model80
July 30, 201610 yr Thanks Model80, No worries, happens me all the time! It'll turn up when you're not looking for it. Work on the bike is kind of intermittent at the mo between trying to keep the grass cut and keeping the jungle at bay! Onwards and upwards, as they say. Larry2.
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.