Piston and Cylinder crapped out - Page 2 - Yamaha Raptor Forum
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post #11 of 32 (permalink) Old 06-18-2019, 02:55 PM Thread Starter
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Are sleeves for the cylinder reliable? I am being told that they make the cylinder stronger and better than an OEM cylinder even when made into a big bore cylinder.

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post #12 of 32 (permalink) Old 06-18-2019, 07:09 PM
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Are sleeves for the cylinder reliable? I am being told that they make the cylinder stronger and better than an OEM cylinder even when made into a big bore cylinder.

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I do not believe they sleeve these. They can bore them, but then they are sprayed with nickaseal (no idea on spelling).
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post #13 of 32 (permalink) Old 06-18-2019, 08:21 PM
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I can at least help with the spelling..Nikasil is the coating. Sleeves are for going big bore. Sleeve would be the route I would go, and I would go big bore if I had to deal with your issue.

But as DEZ said, try to hone it first to keep cost low and then it would just be rings and piston. At least for the cylinder.

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post #14 of 32 (permalink) Old 06-18-2019, 08:23 PM Thread Starter
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I can at least help with the spelling..Nikasil is the coating. Sleeves are for going big bore. Sleeve would be the route I would go, and I would go big bore if I had to deal with your issue.
The person that told me about the sleeve (geisekperfornance) advice I went big bore... But I am scared about reliability

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post #15 of 32 (permalink) Old 06-18-2019, 09:22 PM
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[QUOTE=palvarez05;3449815]
Quote:
Originally Posted by morphrider View Post
I can at least help with the spelling..Nikasil is the coating. Sleeves are for going big bore. Sleeve would be the route I would go, and I would go big bore if I had to deal with your issue.
The person that told me about the sleeve (geisekperfornance) advice I went big bore... But I am scared about reliability

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]
Reach out to Cuervo racing, that is what he does. Has everything you need plus the map.
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post #16 of 32 (permalink) Old 06-18-2019, 10:16 PM
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Both Cuervo and Geisick can take care of what you want done. Geisick is an hour from me, did my dyno runs and has been in the biz for quite a while as well. Terry has done quite a few big bores, I felt it just wasn't in the cards at the time for me.
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post #17 of 32 (permalink) Old 06-19-2019, 12:33 PM Thread Starter
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Both Cuervo and Geisick can take care of what you want done. Geisick is an hour from me, did my dyno runs and has been in the biz for quite a while as well. Terry has done quite a few big bores, I felt it just wasn't in the cards at the time for me.
Cuervo says don't sleeve it, he rather bore it and coat it... Geisick says sleeve it... Wonder what route should I go... Or just buy a new cylinder all together.

New cylinder is 515

Cuervo is 450

Geisick is 375

Geisick claims his stainless steel sleeves make the cylinder stronger than oem.

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post #18 of 32 (permalink) Old 06-19-2019, 01:15 PM
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I would investigate the sleeping more. These cylinders do not have sleeves now, I would be a little suspect in putting one in.
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post #19 of 32 (permalink) Old 06-19-2019, 01:16 PM Thread Starter
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I would investigate the sleeping more. These cylinders do not have sleeves now, I would be a little suspect in putting one in.
Geisick stands very much behind their sleeves and as far as I've searched. He is the only one that does stainless steel sleeves

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post #20 of 32 (permalink) Old 06-19-2019, 04:17 PM
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DON'T sleeve or bore a factory cylinder. It decreases the water jacket and then it runs hot. If you want a stock bore buy a factory cylinder or check with Millennium Technologies. They strip and re-plate factory cylinders. If you want a big bore cylinder get it from Cuervo with the bigger water jacket. If you go big bore you'll also need studs and a SCE head gasket.

FYI, years ago there were a rash of sleeved cylinders that after a few hours of expansion/contractions of dissimilar metals, the sleeve would slip out of position.

Have you checked your cylinder? It may be good! If you want reliability go with factory bore.
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Last edited by DEZPERADO; 06-20-2019 at 08:52 AM.
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