[Ultimateduster]

I know this question isn't for a Yamaha but this forum has the very knowledgeable people so I figured this is the place to ask.

I came into a 81 xr200r for 100$ in which the PO had torn the engine apart and gave up leaving it in boxes. I managed to fully rebuild the engine up to the cam. The PO had bought a cylinder/piston kit for it that was a bit oversized. It says 250cm on the cylinder but fit perfectly on the 200 engine till I got to getting the timing chain on the cam gear. It falls around a inch short. I'm guessing this is because the new cylinder is alittle taller but my question is
A: will finding a slightly longer timing chain effect the timing?
B: although I don't know the demensions of the OEM cylinder if this is taller am I going to loose all compression since the stroke on the rod won't be long enough?

 

[t web2007]

If the cylinder height is enough to affect timing chain length, it’s certainly going to ruin compression. You need the proper rotating assembly setup for that deck height.

Timing chain length does not affect timing, so long that it can be properly tensioned.

 

[Sixpack577]

What engine is the taller cylinder off of/bought for, any idea?

 

[Ultimateduster]

Thank you for the clarification t Webb. That's what I suspected. I took off the head and watched the stroke, it's a half inch from the deck.
Six I'll post the link I was given for the kit

Cylinder Piston Gasket Kit 65.5mm For Honda CRF230F CRF230L/M SL230 XR230 USA⏳ | eBay

Find many great new & used options and get the best deals for Cylinder Piston Gasket Kit 65.5mm For Honda CRF230F CRF230L/M SL230 XR230 USA⏳ at the best online prices at eBay! Free shipping for many products!

www.ebay.com

 

[Sixpack577]

The link says the cylinder "may be big" for that engine, and others.
I think it's a language barrier and an incorrect part.
It's listed for multiple engines of various displacement too(as multiple bore and stroke combinations can equal the same overall displacement).
I think the manufacturer just assumed that cylinder would work on more models than it actually does.

 

[Ultimateduster]

I appreciate the input from you guys. I figured as much but it's good to bounce stuff off knowledgeable people sometimes. I got a stock cylinder I'm going to have bored and ordered a new piston. Figured it's better in the long run as most these new cylinders have a chain tensioner slot and this 82 XR has it built into the case.