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Message started by twistytwist on 06/04/17 at 19:51:18

Title: Twelve Years Later!
Post by twistytwist on 06/04/17 at 19:51:18

Its been a long time, folks! In 2005 or so, I put on the VM, dropped in the performance cam, took off for the test ride and man did it pull! Then the cam chain tensioner failed. It felt like it still had life when the motor was apart, but jumped out, and the brand new cam and my ticker arms ate each other. Destroyed. I found an old motor from an 80s model, and did nothing with until now. So now I'm running a four speed, still need to modify the chain tensioner (or better, rebuild the old motor with a stage two cam and resleeve it to take something like a 100mm piston. Think the case would need boring?) but I have more trouble. The bike won't go over 50mph. Clutch slipping maybe? It isn't really revving either, but it does slip when you start off, then seems okay until about 40mph, then gets reaaalllly slow until 50-55, then nothing. I digress. Hello again, was the point of this! I'll get some pictures up soon.

Title: Re: Twelve Years Later!
Post by LANCER on 06/04/17 at 20:06:00

You cannot use a 100mm piston...already tried.
I talked it over with Bill at Bore Tech some years ago to get his professional opinion.
Boring to that size will only leave less than 1mm down at the bottom of the cylinder sleeve. It is fun to think about such things though.
You might get by with a 98mm if you can find one that has ALL of the correct deminsions needed. I would call a tech person at Wiseco Pistons to confirm that if I were you.
Currently the 95/96/97mm sizes are what we have to work with.

Title: Re: Twelve Years Later!
Post by MMRanch on 06/04/17 at 20:22:02

TT

Sounds like you got the timing chain one tooth off . I've had the same problem when I took apart my first bike to "See-how-it-worked" .

Check it to see , and if it ain't the timing chain off a tooth or two then , I'll buy ya a Dragon Humbugger or similar item at one of our outing ! ;)

I'll go further than that , Your timing chain is on the slow side at least one tooth :).

Did I understand you haven't put a Versey on your bike ???? :(

Title: Re: Twelve Years Later!
Post by verslagen1 on 06/04/17 at 20:48:56

That's what I think too.
when the chain is stretched, the cam won't line up with the head, the forward side will be high.

Title: Re: Twelve Years Later!
Post by MMRanch on 06/04/17 at 21:03:33

the forward side will be high

Yea , and then add in the whole tooth from setting it one off and now its 1.5 tooth slow . The result will be exactly what you described ... No Joke ...

With out the Versey your chain life is +- 15,000 miles ... The Versey will easily double that and with a milder spring in the tensioner , it should be good for close to 45,000 miles. Mine has almost 40,000 on the original chain and still runs great. Keep the idle 1,000 or more ! ;)

Title: Re: Twelve Years Later!
Post by justin_o_guy2 on 06/04/17 at 21:05:15

Arlen has a sneaky
How to
Set up the used chain so the cam is real close to timed as If the chain were new.

Title: Re: Twelve Years Later!
Post by twistytwist on 06/04/17 at 21:22:50

Is Versey a term that's appeared in the last decade? I'm lost! I haven't opened this motor up, no clue on the mileage. I'm pretty sure I welded an extension on the tensioner from the last motor when I blew it, I'll check around for it, and I even have a new cam chain to pop on if it's stretched. Well, NOS anyway. Thanks for the responses, all! Lancer, I think you're the last person I talked to on here a decade ago, just after getting the cam and carb from you. Will the, ah, eaten up cam work as a core? Probably not good to do a second weld and grind... Now I don't think I can resist popping over to the politics section and making enemies of everybody. All in good fun!

Title: Re: Twelve Years Later!
Post by verslagen1 on 06/04/17 at 21:59:00

follow the link to the right.

Title: Re: Twelve Years Later!
Post by ls650v on 06/05/17 at 03:03:37

Can't use a stock 4-speed engine with a 5-speed CDI box. Maybe one of the forum experts can elaborate.

Title: Re: Twelve Years Later!
Post by Dave on 06/05/17 at 03:24:53

382762616422540 wrote:

Can't use a stock 4-speed engine with a 5-speed CDI box. Maybe one of the forum experts can elaborate.

Yep.....that is a real possibility as the cause of the sluggish performance. Did you bolt your 5 speed left side cover and stator assembly onto the 4 speed engine cases?

Title: Re: Twelve Years Later!
Post by verslagen1 on 06/05/17 at 07:00:41

5spds are timed different than 4spds. And the secret is to swap the rotor.
Use can use the cdi from a 5spd if you keep the rotor from the 5spd.

Title: Re: Twelve Years Later!
Post by LANCER on 06/07/17 at 20:55:42

7C7F617B7C717C7F617B7C080 wrote:

Is Versey a term that's appeared in the last decade? I'm lost! I haven't opened this motor up, no clue on the mileage. I'm pretty sure I welded an extension on the tensioner from the last motor when I blew it, I'll check around for it, and I even have a new cam chain to pop on if it's stretched. Well, NOS anyway. Thanks for the responses, all! Lancer, I think you're the last person I talked to on here a decade ago, just after getting the cam and carb from you. Will the, ah, eaten up cam work as a core? Probably not good to do a second weld and grind... Now I don't think I can resist popping over to the politics section and making enemies of everybody. All in good fun!

If the bearing surfaces are good, the lobes can likely be rewelded again IF they are not just totally eaten up. A good quality close up photo would be helpful here.