Upper - CR0574 - 26x47x15mm

Lower - 4T-32005X - 25x47x15mm

Hopefully this helps someone out!

Hey guys I had a hard time finding the correct seal head for my 1991's rear shock rebuild so I wanted to pass along the info to help out anyone attempting to do this job. The third one I ordered was the correct one, turns out it's the same one as a 1991 CR250R.

The correct dimensions for the seal ...

If you hold out long enough one will probably pop up on one of the auction sites, but you could set up a Trail Tech Vapor or similar modern dash for not a lot of money.

Update: Leisure trail does still offer new thermostats. I had a gentleman in England offer to order one and ship it to me!

Welcome, nice bike!

Thanks for sharing!

I'm in the USA so even though I've tried to give Leisure Trail copious amounts of money, they aren't interested in taking it from me!

My 86 Fourtrax 250R and my 1990 KDX200 don't use a thermostat. I honestly don't know of any others that do, though I'm sure they exist.

I'd be interested if you had ...

Yeah I've checked everywhere online and nobody has one. It's been saved in my CMSNL wish list for a year now hoping it will become available but so far no luck.

None of my other two strokes use one so I'm not sure exactly why this one does, but I trust Hondas judgement and want to run it, but in ...

My MK2 doesn't have a thermostat installed, it was missing when I bought it. The Honda one is discontinued, has anyone found an alternative option, or should I just run it?

I found the oring, it sits in the groove of the sleeve that goes over the crank:

https://live.staticflickr.com/65535/53386359317_a7845e11a4.jpg PXL_20231209_185858924 by The Real Guy Photography , on Flickr

https://live.staticflickr.com/65535/53387280456_0acd391991.jpg PXL_20231209_185653025 by ...

Thanks a lot, I'm going to have to take a close look to see if it's still on the crank.

Hey everyone, I didn't see this oring number 18 when I tore down my engine. Does it go behind the crank bearing or on the other side of the case?

Clipboard01 by The Real Guy Photography, on Flickr

Thanks nicko, good info!

OK phew, it's included in the gasket kit that I ordered! Thanks again

Thanks guys, that's really helpful! I just noticed #4 in the picture, any idea how crucial that gasket is?