Topic: 836cc Cylinder walls?

[racemx51]

Hey guys, Im getting ready to send out my cylinders to have it bored for the 836. Ive heard a few times that the walls are pretty thin after that much boring and I should sleeve it... What are your thoughts on this? Is that true or is it a bunch of crap?

[754]

 Not really, you can still take em out to 850c..
 plus they are plentiful and cheap..

[mick7504]

You'll end up with about 2.5mm of wall thickness after boring to 65mm (836)

These motors have been getting drilled out to 65mm for years and years and I'm unaware of anybody having any issues with that being done.

I guess that ideally, bigger/thicker sleeves would be better but "How much better and what will the benefits be?"

If the motor isn't going to be subjected to extreme use, I'd personally be inclined to bore out the stock sleeves.

Keeping in mind that if you decide to go with the thicker sleeves, the cylinder block will need to be bored first for the thicker sleeves and the top engine case will need to be opened up as well.

Mick

[Big Jay]

We only recommended bigger sleeves to the turbo guys who were going to run a lot of boost.

[Hummel]

Found this old thread, saying 2,5mm in Wall thikness. Is that total for both sizes?

Is there a special type of The cb750 with smaller sleeves than The others ?

[Big Jay]

2 mm per side.  They are all the same.