Compression check after rebuild - Kawasaki ATV Forum
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post #1 of 5 Old 04-20-2019, 10:53 AM Thread Starter
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Compression check after rebuild

So fin finally got the rebuild done on the KFX and I went to do a compression check and I found out that I have 125 psi in each cylinder this is before break-in.
this is a far cry from specs I think I read somewhere that it was 30 to 60 PSI. Cam timing is spot-on I did do a full rebuild with hot rods hot crank timing set and of course seals and gaskets. The heads have new valves and about .0050 cut off the surface, the Pistons are Numura Pistons stock bore stock cams. Seems to start fine with no issues of backfiring. I was just wondering is this normal for these engines and that the book I'm reading is wrong.
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post #2 of 5 Old 04-20-2019, 10:59 AM
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More is better, usually, 30-60 is very low
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post #3 of 5 Old 04-20-2019, 12:49 PM
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That 30-60 is with the stock pistons, stock throw crank and stock cams with compression releases. You will be higher. What cams are you using...and do they have the comp releases? Nothing wrong with the 125 anyway.

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post #4 of 5 Old 04-24-2019, 04:24 AM Thread Starter
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Stock cams with releases.
The Pistons are stock bore replacements. Same goes for the crank and rods, all stock diamentions.
Runs great really snappy.
Now I'm wondering if I should have just thrown a set of cams (hotcam)at it.
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post #5 of 5 Old 04-24-2019, 02:42 PM
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Hot Cams are a waste of money & no real gains.

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...
'04 KFX800
DSC 12:1 Pistons w/ Stg 2 cams, Ported Heads, 36mm carbs, Muzzy Super Pro, Dual MTX-L, VFJ Stg 3 Spidermod Clutch & Adj. Weights, +8 Swing Arm, Elka Shocks, 24" 14-paddle Staggered SLS Ripper paddles, BOSS NOSS 40-shot

'04 KFX730
Custom 84mm 12:1 JE Pistons w/ FST Stg 2 cams, Muzzy Super Pro, UPP Crossover Intakes, 8* Timing Key, Elka Shocks, +4 Swing Arm Extension, 24" 10-paddle Skat-Trak Extremes

'04 KFX730
Wiseco 84mm 11.5:1 Pistons w/ Fundy Trail/Race cams, Muzzy Super Pro, Crossover Intakes, 6* Timing Key, Works front & Elka Rear Shocks, +4 Swing Arm Extension, 24" 9-paddle Skat-Trak Extremes

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'04 Prairie 700
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