Cylinder Work

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2/19/2018 6:09 AM

Hey guys, my 125 is on it’s way to 80+ hours. When I rebuild the whole thing, should I have the cylinder redone(replated). If so, who do you recommend? Anyone in Southern Cal?

Thanks!

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2/19/2018 6:17 AM

Replate if it needs a replate. If not wait until it needs one.

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2/19/2018 6:20 AM

Tuna wrote:

Replate if it needs a replate. If not wait until it needs one.

And that’s just a measurement thing?

Do you guys recommend crank rebuild and balance or buy all new crank?

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2/19/2018 6:28 AM

Tuna wrote:

Replate if it needs a replate. If not wait until it needs one.

CarlinoJoeVideo wrote:

And that’s just a measurement thing?

Do you guys recommend crank rebuild and balance or buy all new crank?

If you're in spec, don't bother with the re-plate. As far as the crank, I would have it rebuilt if needed, many crank rebuilders get them better than they come from the factory.

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2/19/2018 6:41 AM

In so cal......125 2smoke....... you could walk in to PC! I think I'd do that if I we're that close.
Replating the cylinder is a decision you would make after inspection once you tear down. Good chance it's not necessary. The wrench rabbit kits do seem very complete and a good value for a full rebuild.

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2/19/2018 8:25 AM
Edited Date/Time: 2/19/2018 8:26 AM

Tuna wrote:

Replate if it needs a replate. If not wait until it needs one.

CarlinoJoeVideo wrote:

And that’s just a measurement thing?

Do you guys recommend crank rebuild and balance or buy all new crank?

In my experience, it's not a measurement thing but more about visual inspection. The nikasil will usually become visually damaged well before it wears out from excessive hours on the engine. So while you could measure the bore and compare it to spec, determining nikasil health that way, it's often not necessary if the plating looks healthy, without any chipping or vertical streaks and still with good crosshatch. If it looks healthy, then the bore is likely to be in spec. Any imperfection you can feel with your fingernail is definitely cause for a replate. Also check for ring ridge at the top of the bore.

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2/19/2018 8:32 AM

Tuna wrote:

Replate if it needs a replate. If not wait until it needs one.

CarlinoJoeVideo wrote:

And that’s just a measurement thing?

Do you guys recommend crank rebuild and balance or buy all new crank?

KooyaKooya wrote:

In my experience, it's not a measurement thing but more about visual inspection. The nikasil will usually become visually damaged well before it wears out from excessive hours on the engine. So while you could measure the bore and compare it to spec, determining nikasil health that way, it's often not necessary if the plating looks healthy, without any chipping or vertical streaks and still with good crosshatch. If it looks healthy, then the bore is likely to be in spec. Any imperfection you can feel with your fingernail is definitely cause for a replate. Also check for ring ridge at the top of the bore.

Ok very interesting! I’ll post some photos when I put the next piston in. Appreciate the info guys!

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2/19/2018 8:45 AM

If you did not suck any dirt or have any type of piston/crank failure, the cylinder should be fine. I would have Crankworks rebuild your OEM crank. The wrench rabbit kits come with a Chinese crank...something I would never trust in my bike....especially in a small bore.

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Tomac and/or Anderson for 2020.....

2/19/2018 9:40 AM

You can hit the plating with some scotchbrite to get rid of any glazing and get some crosshatch back if it’s there.

Don’t hone it.

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If you're not mixing gas, you're not haulin ass.

2/19/2018 9:51 AM

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I ripped a start from Egypt and I was happy about that.