300/440/550 leak down test question / carb adjustments not working

whennotsailing

whennotsailing

Location
grand rapids/holland/Grand Haven MI
I am doing a leak down test on my kawai 550 ('84 piston port) How many lbs should I put in and how long should it hold it? I have gone up to 12 psi thus far, and it loses the first 2 lbs in about 2 minutes, it hits zero after about 20 minutes. Should I be concerned?

I put the ski together with pipe, intake manifold, etc but have never been able to get the carb needles to have much effect on tuning. Carb is a 44 BN (thats right, BN not SBN) which was recently rebuilt. still no changes. Compression is right around 140 on both cylinders. The ski runs ok, but doesn't have much punch for the parts that I have on it. Whats next?

Let me know asap.

Thanks.
 
V

vrizi

If you are losing 2# in 2 min. I would say that you have a leak somewhere. I would start looking for where that leak is at. Pump it up again and spay it down with soapy water,... it may be hard to find, but it is there somewhere. You also might try spraying some carb cleaner around the intake side while it is running and see if you have any change in rpm.
 
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