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Post by JonW on Jan 16, 2015 1:26:12 GMT 1
Ive been searching but cant find any threads that tell me what exactly what needs to be done to get the slightly wider (i think) ypvs crank into the LC cases. I am considering it as I have a ypvs crank here and it seems that it would be an easier to source option.
Im sure the old TSS site used to talk about what was needed, but that seems to have gone now too. (please no TSS comments on this thread, its not needed)
so anyone know what needs to be done or can link me to a thread with the info in, i just cant seem to locate one, ta!
And... I also assume that doing this wont snooker me with the piston pin size or some other issue?
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Post by muttsnuts on Jan 16, 2015 9:36:52 GMT 1
Hi Jon, funnily enough I am working on this at the moment, I've got one of each engine on my bench currently and I am measuring etc as I've got a "one off" build to do and this is an option I am considering, but for very different reasons !
Once I've finished measuring etc I'll send you the details, unless of course as you say somebody has a link to a page where its been done
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Post by 4l04ever on Jan 16, 2015 9:38:23 GMT 1
I have seen it mentioned in the past that they fit some engines and not others, so may need trying in for size to see if it clears okay.
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Post by muttsnuts on Jan 16, 2015 9:41:45 GMT 1
agree, but for it to be correct there is some machining to be done, its not much, more awkward than anything, but the clearances are key, having measured several cranks there are variances that's for sure
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Post by 4l04ever on Jan 16, 2015 10:09:22 GMT 1
I have heard of some being fitted without modification, so you will have to cross your fingers and hope you have a good combination of crankcases and crank. If not, get the crankcase modified to fit!
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Post by JonW on Jan 16, 2015 12:25:38 GMT 1
I didnt know that some would fit directly in, thats interesting, but as Mutts says, I think I would want to make sure i had all the clearances correct if i was to do this work. Mutts, defo interested in your results mate, I knew someone would be doing this, as we know there is always someone out there almost as mad as we are LOL!  |
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Post by muttsnuts on Jan 16, 2015 14:16:27 GMT 1
yes, they don't come much madder than me that's for sure !
One of the things I am working on is how to machine the casings easily, so I am looking at making a suitable tool to do it easily without the need for a milling machine etc as its not like eveyrbody happens to have one of those in their garages !
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Post by midlifecrisisrd on Jan 16, 2015 15:05:25 GMT 1
Think it was bare that had said some fit.
He may have the info about where it needs machined
Steve
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Post by JonW on Jan 16, 2015 23:07:19 GMT 1
yes, they don't come much madder than me that's for sure ! One of the things I am working on is how to machine the casings easily, so I am looking at making a suitable tool to do it easily without the need for a milling machine etc as its not like eveyrbody happens to have one of those in their garages ! Tool sounds interesting, and thinking about this is should add to the ccu so its a good gain whatever you do  |
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Post by slinger on Jan 17, 2015 0:42:33 GMT 1
1mm off the PTO side of the cases and .80mm off the PTO main bearing, use a little blue loctite on the mains and job done. LC,s do like a +4mm crank mid 60,s easy.......nice
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Post by bare on Jan 17, 2015 2:15:11 GMT 1
I had 3 LC engines of 4y3 prefix that accepted a '97 Vps crank.
Both before And after it's being Rebuilt by SCRracing.com.
IF inserting a photo was easier 'here' I'd post it.
Dunno.. Why it fits in some and not others.
Don't actually care.. truth be told :-)
I had sent my stuff to SCR to have my cases machined..to accept the Vps crank.
He quoted $100 for the wee amount of work required. A skim off both outer case bearing mount faces.. he said.
Turns out it wasn't needed. It Fit OEM, with race worthy running clearances, he claimed.
As he has been continually racing/winning with yama 350s since'73... fairly trustworthy information, IMO.
Didn't end up using the LC cases though.. as an VPS engine proved a better choice.
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Post by JonW on Jan 17, 2015 2:22:21 GMT 1
Thanks guys! Glyn, I didnt know +4 would work in the LC cases, but of course it should, the ypvs is basically an Lc case so why not Its actually a tempting conversion actually as I can get a +4 for sensible money... hmm... Im assuming the same pistons as one would use for the ypvs and then nibble off the tang at the bottom and jobs a good un? |
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Post by slinger on Jan 17, 2015 2:59:45 GMT 1
Thanks guys! Glyn, I didnt know +4 would work in the LC cases, but of course it should, the ypvs is basically an Lc case so why not Its actually a tempting conversion actually as I can get a +4 for sensible money... hmm... Im assuming the same pistons as one would use for the ypvs and then nibble off the tang at the bottom and jobs a good un? Jon it just makes total sense , if ya going to the trouble to fit the RZ crank why would you not go for a 58mm stroke. Just so happens I have a milling machine in the workshop and with a bit of porting and a good pipe which just so happens I make....... your see 66WRhp with out to much work............fun......fun....fun. But of course I use o-rings so it wouldn't last 20.ooo hours so it ain't worth doing really...................just google it lol |
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Post by JonW on Jan 17, 2015 12:22:27 GMT 1
haha, 20 hours... thats like a years riding for me with so many bikes LOL! (joke before anyone gets ansy  ) |
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Post by frosti on Jan 17, 2015 12:34:33 GMT 1
Seems like a lot of work to me. Is the YPVS-crank that much better than the LC-crank? Or what is the catch? Seems, to me, it would be a lot easier to use the entire YPVS-Engine. But thats just my 2 cents.  |
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Post by lb on Jan 17, 2015 14:22:03 GMT 1
Think Jon is researching for a stock LC looking rebuild but with lil something extra inside ;-)
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Post by muttsnuts on Jan 17, 2015 19:46:00 GMT 1
yep, that's the crux of it, looks stock, goes like stink !
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Post by JonW on Jan 17, 2015 22:37:13 GMT 1
Yep LB and Mutts know my plan; stock looking bike (its a resto) but with some added pep |
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Post by frosti on Jan 17, 2015 22:40:22 GMT 1
Ok, that was the idea. Doesnt the early TZ-crank fit straight in? Then it is real racing,,i mean. |
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Post by Tobyjugs on Jan 17, 2015 23:12:16 GMT 1
Hey Slinger, have i rattled your cage? or should i say box of O-rings |
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Post by slinger on Jan 17, 2015 23:20:31 GMT 1
Hey Slinger, have i rattled your cage? or should i say box of O-rings Na you ain't rattle my cage ........takes a lot more than that to piss me off...........just having a poke |
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Post by Tobyjugs on Jan 17, 2015 23:29:02 GMT 1
Hey Slinger, have i rattled your cage? or should i say box of O-rings Na you ain't rattle my cage ........takes a lot more than that to piss me off...........just having a poke One thing I have learned over the years is "There's more than one way to skin a rabbit" |
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Post by slinger on Jan 17, 2015 23:48:18 GMT 1
Na you ain't rattle my cage ........takes a lot more than that to piss me off...........just having a poke One thing I have learned over the years is "There's more than one way to skin a rabbit" Yep your right I skund 7 rabbits this week.............each one was different........they got slower to skin the more rum I drank |
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Post by JonW on Jan 18, 2015 8:44:44 GMT 1
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db8888
Thrash Merchant
Posts: 329
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Post by db8888 on Jan 18, 2015 10:50:31 GMT 1
yes, they don't come much madder than me that's for sure ! One of the things I am working on is how to machine the casings easily, so I am looking at making a suitable tool to do it easily without the need for a milling machine etc as its not like eveyrbody happens to have one of those in their garages ! Hello couldn't you split an old lc crank in half and mount a cutter on the web and turn it with a drill |
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