Looking to ID who did the work on this cylinder

Discussion specific to the 1991 - 1994 KDX250 sold in the USA
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91 KDX 250
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Looking to ID who did the work on this cylinder

Post by 91 KDX 250 »

I just acquired a 1991 KDX250 (joy :grin:) and it appears to have been worked on.
Still have not checked the carb for the usual mods, but the cylinder has engraved initials on it.
Looks like a =KB except the top line is longer than the middle one. Hard to explain.

I'll try to grab a picture later tonight and check the carb for the mods.
Does have a Pro circuit pipe with stock silencer.

Seems it was modified quite a while ago.
Any other goodies I should look for?
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Re: Looking to ID who did the work on this cylinder

Post by KDXGarage »

Welcome to kdxrider. Post a pic. What country are you and the bike from????
Thank you for participating on kdxrider.net. :bravo:
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Looking to ID who did the work on this cylinder

Post by ohgood »

Ron Black?
91 KDX 250
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Looking to ID who did the work on this cylinder

Post by 91 KDX 250 »

Hey all, thank you.
From the USA.

Here is a picture. There are 3 "speedy" lines in front lol
Image
Image
Last edited by 91 KDX 250 on 09:03 am Feb 07 2018, edited 3 times in total.
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Re: Looking to ID who did the work on this cylinder

Post by KDXGarage »

Thanks.
Maybe someone will know.
Thank you for participating on kdxrider.net. :bravo:
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91 KDX 250
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Re: Looking to ID who did the work on this cylinder

Post by 91 KDX 250 »

There we go. Had to include link to full size image, for whatever reason it was linking to the thumbnail.

Will have a check today to see what the carb has in it
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Re: Looking to ID who did the work on this cylinder

Post by david »

There is a KB Motorsports in KY. Don't know how long they have been in business or if they used to do custom cylinder work, but you could give them a call.
'81 KDX 175
'90 KDX 200
'07 Vulcan 2000 Classic LT (totaled 4/25/15)
'82 Honda GL500 (sold)
'96 ZXi 1100 JetSki
'98 STX 1100 JetSki
91 KDX 250
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Posts: 10
Joined: 03:56 pm Feb 06 2018
Country: USA
Location: USA

Looking to ID who did the work on this cylinder

Post by 91 KDX 250 »

Thanks.

Doesn't look like anything special was done to the cylinder or head except it was sleeved.
Was pretty worn out lol. cylinder measured at 67.9577mm and piston at 67.3633mm.
Just over half a millimeter of side wall clearance!

It's not oval, nor does it have any scarring, so I Might try to hone it out to size a 68mm piston but don't have actual measurement specs of the 68mm wiseco piston # 607M06800

Has anyone mic'd a 68mm piston? Would hate to waste $100+ if the 68mm pistons mic out smaller.

Other than that, it looks like I might have to get it bored to 68.5.
Can y'all suggest reputable shops that don't bore out on the high clearance side of things.(hate when they do that)

Thanks!
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