I have a '98 XCF 440. It started running like a turd last year. When it got hot, it wouldn't restart. Let it cool down, it would restart.
So I did a compression test, and had low compression. So I ordered some SPI pistons, honed the cylinders quickly, and put it back together. I think it had like 105psi which still wasn't great. Started, but the season was almost over.
Anyhow, this year I went to start it. Wouldn't run by itself, but would run on starting fluid. Long story short, water got in the fuel. Drained the tank, cleaned both carbs in my ultrasonic. Put it back together, started first pull. Road it for 15 minutes, shut it off. It never started again.
Compression test is 90psi in either cylinder, throttle wide open. If I add a teaspoon of oil I get around 110psi. Won't start.
I have spark at the plugs. It won't even start on starting fluid.
Fuel system is 100%. Fuel on plugs. I even added a ski-doo style primer. Clear fuel lines, carbs are full, etc. It's NOT a fuel problem.
I'm assuming 90psi just isn't enough to kick it. I'm at a loss. I put a new track on, studded it, new gearbox with reverse, carbs rebuilt, new brakes. Now it looks like it needs pistons and cylinders.
So I guess my first question is if you folks agree 90psi is dead. Second question, what do you guys typically do for overbore? Can I just have the cylinders bored or do they need to be resleeved? Are these special plated cylinders ? If so do they need re-plating after boring? OE new cylinders are very expensive. Realistically, I don't think I could get $1,000 for the sled in perfectly running condition. So If it's too much to fix I may just part it out. Which is sad.
-- Joe
So I did a compression test, and had low compression. So I ordered some SPI pistons, honed the cylinders quickly, and put it back together. I think it had like 105psi which still wasn't great. Started, but the season was almost over.
Anyhow, this year I went to start it. Wouldn't run by itself, but would run on starting fluid. Long story short, water got in the fuel. Drained the tank, cleaned both carbs in my ultrasonic. Put it back together, started first pull. Road it for 15 minutes, shut it off. It never started again.
Compression test is 90psi in either cylinder, throttle wide open. If I add a teaspoon of oil I get around 110psi. Won't start.
I have spark at the plugs. It won't even start on starting fluid.
Fuel system is 100%. Fuel on plugs. I even added a ski-doo style primer. Clear fuel lines, carbs are full, etc. It's NOT a fuel problem.
I'm assuming 90psi just isn't enough to kick it. I'm at a loss. I put a new track on, studded it, new gearbox with reverse, carbs rebuilt, new brakes. Now it looks like it needs pistons and cylinders.
So I guess my first question is if you folks agree 90psi is dead. Second question, what do you guys typically do for overbore? Can I just have the cylinders bored or do they need to be resleeved? Are these special plated cylinders ? If so do they need re-plating after boring? OE new cylinders are very expensive. Realistically, I don't think I could get $1,000 for the sled in perfectly running condition. So If it's too much to fix I may just part it out. Which is sad.
-- Joe
'98 XCF 440 compression
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