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With the throttle held wide open, the compression should be between 140 psi and 180 psi. If the compression reads lower that 140 psi, adjust the valve tappet clearances and try again. Insufficient valve tappet clearance is the most common cause of low compression in four stroke engines.
Loosen the valves up and reset valve clearance and since it is blowing out the exhaust there is 3 things it can be, timing belt, or chain or valves to tight or distrbutor is off. My guess is you put the chain on and it slipped 3 or 4 teeth and is backfireing threw the exhaust. If you need more help post here and I will help.
All you need is to adjust the valve tappet clearance back to the original specification. It is a time consuming effort and require passion to do it. You need to remove the top engine cover, set timing belt to top dead centre then adjust intake & exhaust valve clearance one by one. Rotare the cranckshaft 180 degree and repeat the valve clearance,. I would suggest to leave it to the expert.
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