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Post by Tobyjugs on Jan 15, 2023 23:11:38 GMT 1
Hello gang. I was asked to box up the lower half of a YPVS engine. Upon inspection of the crank shaft i notice the clutch side outer beariing of the crankshaft has no little nib or O-ring to locate the bearing also the pins have been welded. Is this normal practice from Hotrods? I think the crankshaft was bought in Spain. 
I think i will drill and pin the bearing unless advised not to do it. |
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Post by JonW on Jan 16, 2023 2:32:54 GMT 1
Most aftermarket cranks use a bearing without a pin, they rely on some thing else like an o ring or some bearing lock (one case half only!) to hold them in place.
Lots of aftermarket cranks have welded pins as well. Dubious as an upgrade and kills the rebuild market as many rebuilders wont touch em.
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Post by midlifecrisisrd on Jan 16, 2023 9:29:29 GMT 1
Yes, no pin on RH bearing
Only really an issue if the bearing fails
The bearing behind the sprocket has no pin
Blob of bearing lock on assembly if concerned
Steve
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Post by Tobyjugs on Jan 17, 2023 22:39:57 GMT 1
Thanks for the replies. Yes maybe i should just fit as is.
One thing is for sure using bearing lock is one of the very last things i would use. Thats because of the chance of shimming, even when using the correct type.
Another thing i noticed that i forgot to mention was how sloppy the key way is for the driving primary. Hotrod cranks are supposed to be good quality aren't they?
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Post by jon on Jan 17, 2023 22:46:05 GMT 1
I was advised to use a blob of bearing lock on the bottom case when using a hot rods crank.
Jon
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Post by midlifecrisisrd on Jan 17, 2023 22:56:18 GMT 1
That was my understanding too
Got a new one on a shelf š¬
Steve
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Post by JonW on Jan 17, 2023 23:13:34 GMT 1
Thanks for the replies. Yes maybe i should just fit as is. One thing is for sure using bearing lock is one of the very last things i would use. Thats because of the chance of shimming, even when using the correct type. Another thing i noticed that i forgot to mention was how sloppy the key way is for the driving primary. Hotrod cranks are supposed to be good quality aren't they?Its funny you ask this Tony. I watched their video about how they were American made and they banged on and on about how they were good quality, and yet my memory of them was that they just werent. I put this down to them previously buying stuff made poorly from somewhere in Asia but of course it could all just be flannel. |
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Post by Tobyjugs on Jan 17, 2023 23:18:55 GMT 1
Thanks for the replies. Yes maybe i should just fit as is. One thing is for sure using bearing lock is one of the very last things i would use. Thats because of the chance of shimming, even when using the correct type. Another thing i noticed that i forgot to mention was how sloppy the key way is for the driving primary. Hotrod cranks are supposed to be good quality aren't they?Its funny you ask this Tony. I watched their video about how they were American made and they banged on and on about how they were good quality, and yet my memory of them was that they just werent. I put this down to them previously buying stuff made poorly from somewhere in Asia but of course it could all just be flannel. I guess i will hear about it if it's not up to scratch, its going to be used for track only. That should be a good test for it. |
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Post by jon on Jan 18, 2023 8:30:16 GMT 1
I bought mine off mad biker. He said he had one in his bike, and that they were one of the best makes for trueness.
Jon
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Post by midlifecrisisrd on Jan 18, 2023 9:53:06 GMT 1
I'm sure mutts uses them a lot, not heard any nightmares
Am I right in thinking even yom never pinned this bearing and just has a small ball bearing in a very shallow hole
Would say to me that drilling and pinning is I'll advised
Steve
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Post by Tobyjugs on Jan 18, 2023 19:00:58 GMT 1
I bought mine off mad biker. He said he had one in his bike, and that they were one of the best makes for trueness. Jon Yes for a welded crank it was 0,02mm which is ok. |
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Post by Tobyjugs on Jan 18, 2023 19:06:44 GMT 1
Most of the cranks i've seen have had a little nib on that bearing. I've just fitted it like it came after all if it does seize i'm not sure if that nib would help too much.
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Post by steeley on Jan 18, 2023 19:40:36 GMT 1
Hi , in the past when i have had yamaha 350 cranks rebuilt i have had Rgv250 r/h bearings fitted on that side of the crank . They have a roll pin fitted which is opposite the groove . I just made a notch in the lower case gearbox side .
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Post by jon on Jan 18, 2023 22:36:51 GMT 1
Most of the cranks i've seen have had a little nib on that bearing. I've just fitted it like it came after all if it does seize i'm not sure if that nib would help too much. I may be wrong but I donāt think the pins are there for a seizure situation? I think itās probably there to stop chatter and wearing the journals out as a result? If it is then a blob of bearing seal would do this. Jon |
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Post by wallcraft on Jan 19, 2023 9:33:36 GMT 1
I had a hot rods crank off Martin as well a while back, had the outer mains upgraded as well which had no pins. My cases were mint with no chattering makes so went ahead and used a very thin smear of bearing lock.
I can remember feeling a little uncomfortable using the bearing lock for the reasons Tony said (shimming) but couldnt find any info for alternative solutions other than pinning which was beyond my skills in me home garageš
Seems to be ok after an all day dyno session and about 1500 road miles. But who knows now Iāve said this!!
The rods are made in America the rest is Taiwan.
Mark.
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Post by steve63 on Jan 19, 2023 13:48:27 GMT 1
Most of the cranks i've seen have had a little nib on that bearing. I've just fitted it like it came after all if it does seize i'm not sure if that nib would help too much. I've seen crank cases were the bearing pin has made a deep groove into the case as it's seized and spun. Doesn't that groove have a half circlip thing in it or am I thinking of the gearbox bearing/s? |
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Post by midlifecrisisrd on Jan 19, 2023 14:35:48 GMT 1
Yes it's grooved
Probably why it can't be pinned where the nub is as too thin between the outer face and the bearing groove
Steve
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Post by muttsnuts on Jan 19, 2023 15:59:18 GMT 1
you only use the bearing retainer half moon plate on that bearing, no need to pin etc. You'd be lucky drilling a bearing outer race, they are as hard as F*ck !
I just build them up making sure all surfaces are ultra clean, don't use bearing lock or anything, if the crank/bearing siezes then it will spin in the cases no matter what you use to try and stop it !
If the 2 halves of the crank cases are good and intolerance, then the main beraings are clamped in place and won't move
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Post by bare on Jan 30, 2023 18:55:39 GMT 1
Curiously EE recently claimed that the Vitos Cranks (google) are 'Best of Breed' crankshafts.
By a large margin even ... If anyone would know :-)
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Post by JonW on Jan 31, 2023 1:58:56 GMT 1
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Post by bare on Feb 1, 2023 16:43:40 GMT 1
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Post by JonW on Feb 2, 2023 1:55:35 GMT 1
Ahh gotta love companies who dont update their web properly...
Thta page says: "These retail for over $500, but get them here on the cheap."
And then when you add in a year to see the price... $539.99.... Sigh....
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Post by bare on Feb 5, 2023 5:44:20 GMT 1
At 400 U$. This IS ~1/2 the price of a Genuine Yama crank.
Remembering the Performance version is the EE recommended crank.
NOT the 540$ 'OEM' version... which has perennially been much higher priced... an Odd item.
And welding is Not an issue .. despite shade tree Rebuilders hate of the technique.
IMO likely because they can't deal with the lost business opportunity, being the truth of it.
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Post by JonW on Feb 5, 2023 21:56:25 GMT 1
Ahh ok, I finally found what youre talkin about, its their PC350
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