Maintenance & Technical > KX500 Original
Glue the main bearings?
tschisi:
Hi!
I?m in the middle of my bottom end rebuild, but now i?m facing a big problem.
My crank was worn.
A well-known honda machine shop which owns a race team itself, repaired it.
I?ve already got the seals and bearings in the cases, and the crank in the right case.
Now i noticed that i can slide the left main bearing, which is not installed yet, onto the crank and remove it again!
:-o
I called the shop and they told me that in some engines the crank is designed in a way that one crank-side is "thinner" for assembling and dismanteling reasons.
I never heard of something like that in k5 engines. :-(
They sent me some kind of loctite (in fact it?s Honda Lock 3, a threadlock from honda) to glue the bearing onto the crank while putting the left case on it (and hope that enough of the glue stays between shaft and bearing instead of getting wiped onto the seal).
It?s supposed to last 100hrs, which wouldn?t be shorter than the mains or conrod i think.
What do you think?
NZ500:
Hi. It's a worry that they'd recommend doing that. It's not good/reliable. There's probably new cranks available for a reasonable price in America. Mrcycles seems to do an alright deal on OEM parts if you're not keen on a cheaper hotrods kit.
I'm in New Zealand and have recently had both sides of my crank ground down, hard chrome plated and then ground to factory spec again. The surface is very hard then and should last forever. Have had it done on other bikes and it worked well.
Unless you've got high compression or crank is out of balance/align I would expect the bottom end to last a lot more than 100 hours if done right.
jonny500:
yes that is correct 1 side of the crank is a micron of so less, that is why when you split the cases 1 bearing almost always stays on the crank and 1 in the case. if you crank is worn on the journal you have a problem and it needs sorting properly. imo there is no glue known to man that could with stand the abuse a k5 crank gets and i would not be using it. just my opinion anyway. p.s the main bearings should go in the casing first not on the crank
kwakman:
IMO, both the above replies are on the money.which saved me a sh&tload of typing.Nice :-D
tschisi:
--- Quote ---1 side of the crank is a micron of so less
--- End quote ---
But not so much that i can slide the bearing just onto it, right?
--- Quote ---if you crank is worn on the journal you have a problem
--- End quote ---
It was worn, that?s why i sent it to the "machine shop"
--- Quote ---the main bearings should go in the casing first not on the crank
--- End quote ---
That?s what i wanted to do, i just tried to slide the bearing on casually.
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