Just took off head and piston...Need advise - ArcticChat.com - Arctic Cat Forum
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post #1 of 6 Old 05-07-2017, 05:10 PM Thread Starter
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Just took off head and piston...Need advise

I recently purchased a 03 400 4x4 FIS bike. It wasnt running when I got it and the owner told me he had the piston and cylinder bored over when he had it. I got it started but it would not stay running. The compression test was 51. There was also a weird pinging in the top end once it ran for a bout 30 secs then it would die. I took off the head and cylinder today and noted that there are marks to sides of piston and in same areas on cylinder wall. They arent deep but there. I also inspected the piston rod and there is no play up and down but alot of play side to side. The piston also slides side to side on the wrist pin. Is there supposed to be play in the rod or piston like this? Im thinking bearings gone.Will post some pics of head and cylinder soon.
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post #2 of 6 Old 05-07-2017, 05:43 PM Thread Starter
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Here are some pics
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post #3 of 6 Old 05-07-2017, 06:04 PM
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Just took off head and piston...Need advise

Doesn't look good. Stock piston is 82mm. 10 over is 82.25 and 20 over is 82.5. Do you have a caliper to measure what you have although irrelevant at this point. It would also say on top of piston what oversize it is. Did you confirm that C clip in head was missing?


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post #4 of 6 Old 05-07-2017, 11:09 PM Thread Starter
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C clip was there. Ive read its ok to have a little side to side play on the piston arm but just not any back or forth. I have no play back or forth. The piston has lot of side to side play on the pin. So ya think my cylinder is done? Im thinking of going back to stock.
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post #5 of 6 Old 05-07-2017, 11:28 PM
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post #6 of 6 Old 05-08-2017, 12:08 AM
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Quote:
Originally Posted by moosey View Post
C clip was there. Ive read its ok to have a little side to side play on the piston arm but just not any back or forth. I have no play back or forth. The piston has lot of side to side play on the pin. So ya think my cylinder is done? Im thinking of going back to stock.

The cylinder may can still be bored. You just need to see what it measures now or the piston should say if it is oversized. If it is an oversized piston and it looks like that then you may want to consider more than just a top end or at least look further to see if anything else is wrong. Those 400 Suzuki motors are good motors. For it to have got a piston and rings like that after being bored already would be a red flag. I would make sure there is no play in the small end of the rod and ask if it had even been sunk.
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