Go to Main Site Diff'rent Strokers
For fans of oddball two-strokes everywhere
 
 FAQFAQ   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups   RegisterRegister 
 ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in 
Classic Bike Trackdays

4L0 numbers on my YPVS motor?

 
Post new topic   Reply to topic    Diff'rent Strokers Forum Index -> Yamaha
View previous topic :: View next topic  
Author Message
topfridgeman



Joined: 08 Oct 2012
Posts: 15
PostPosted: Sun Mar 17, 2013 5:43 pm    Post subject: 4L0 numbers on my YPVS motor? Reply with quote
Hello,

Has anyone come across this before? My 31k YPVS engine has this engine number * 4L0-103617* . Is this a very early YPVS motor, or some sort of frankenvalve? The numbers are well stock looking. I assumed that the YPVS and LC barrels, crank etc. were non compatible.

Col.
Back to top
View user's profile Send private message
Norbo



Joined: 13 Feb 2013
Posts: 121
Location: Nottingham
PostPosted: Mon Mar 18, 2013 7:31 am    Post subject: Reply with quote
I have seen a YPVS top end put on an LC just 1 time ever the bottopm casing was moded for this and you would be able to see this. If it is as you say then some one has done it to make them match the frame Yam neve did it so they have bneen tampered with no matter how nice they may look .
_________________
www.rdlccrazy.co.uk. Home of The Onr Stop LC Shop
Back to top
View user's profile Send private message Send e-mail Visit poster's website
topfridgeman



Joined: 08 Oct 2012
Posts: 15
PostPosted: Mon Mar 18, 2013 6:26 pm    Post subject: 4l0 Reply with quote
Oh, right. The numbers don't match anyway, coz it's on a hybrid 4l1 frame. It might be worth me getting a ypvs motor then, as mine's probably down on horses. I'll have to get it on the dyno. Would the 31k crank fit in the lc cases? I assumed the ypvs crank was a much stronger unit?

Col.
Back to top
View user's profile Send private message
Norbo



Joined: 13 Feb 2013
Posts: 121
Location: Nottingham
PostPosted: Mon Mar 18, 2013 10:38 pm    Post subject: Reply with quote
The ypvs crank is better it has a 1mm bigger big end bearing and better webs. But No they will not retro fit in a set of L:C cases as they are to wide . You can masheen lc cases to take a ypvs crank but there is not realy much point with the cost .
_________________
www.rdlccrazy.co.uk. Home of The Onr Stop LC Shop
Back to top
View user's profile Send private message Send e-mail Visit poster's website
topfridgeman



Joined: 08 Oct 2012
Posts: 15
PostPosted: Tue Mar 19, 2013 7:31 pm    Post subject: Reply with quote
Anyone got a ypvs bottom end they want shut of?

Col.
Back to top
View user's profile Send private message
topfridgeman



Joined: 08 Oct 2012
Posts: 15
PostPosted: Tue Mar 19, 2013 7:34 pm    Post subject: Reply with quote
Has anyone got a dyno printout of a stock 31k YPVS bike?

Thanks.

Col.
Back to top
View user's profile Send private message
Display posts from previous:   
Post new topic   Reply to topic    Diff'rent Strokers Forum Index -> Yamaha All times are GMT
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum


Powered by phpBB © 2001, 2005 phpBB Group.  Installed, administered and modified by  Diff'rent Strokers © 2006-2024.