I just bought an OTC cylinder leak down tester. It should help me pin point the problem even better. But most likely i will upgrade to a wiseco 10.25.1 piston and an xr200 cam.
1986 ATC 350X
1986 ATC Big Red 250ES
I wish someone made a TRUE big bore cylinder for the 200 engine. Wouldn't be that big a deal to set the case halves (together) in a bridgeport and bore it to accept a larger sleeve. They do it to VW air cooled engines all the time.
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I see the XR 200 cams say midrange. Would installing that take away from the low end torque on the 200es with the stock cam? Since im going with the 10.25.1 Wiseco piston
Also, If i were to go with an XR200 cam, would i need to replace the camshaft bushing and thrust washer if mine are still in good shape? Sorry for all the questions
1986 ATC 350X
1986 ATC Big Red 250ES
I put an XR200 Cam and carb on my 200S and it woke it up nicely. I also added a SuperTrapp exhaust that took many hours of searching and waiting on ebay to find, still needs to be fine tuned after I saw a tuning sheet from Supertrapp for the XR200, I need to add some discs and rejet. My buddies with stock 185's and 200's can't touch me
I really doubt you'll lose much on the low end, at least not enough to worry about. You have a hi/lo gear range correct? if so, I wouldn't worry about it.
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I also think that the higher compression piston will help with bottom end torque too.
Of my understanding, higher compression is basically making the piston engine more mechanically efficient, but I can't remember what the negative trade-off was. This was more in a sense of car engines, but high compression is great for take offs mpg wise, but horrible for light cruising, low compression is slower take offs but better overall mpg. Pretty sure higher compression increases power overall so even with a higher rpm tuned cam, upping the compression can offset the low end losses.
Awesome thanks for the help everyone!
1986 ATC 350X
1986 ATC Big Red 250ES