Robin 295 engine
 

I Over hauled robin 395 engine, put in new coil, pulsar, plugs, compression is 90 - 100 and spark fire looks ok, motor runs good when cold or warm, when driving around for 5 - 10 minutes it will really heat up and stop running until it will cool off. what could be the problem. It will still make fire and have compression when hot.

Re: Robin 295 engine
 

Was it doing this before you rebuilt the engine ?

Re: Robin 295 engine
 

That is terrible compression. You should be above 150.

Re: Robin 295 engine
 

Did you check compression WOT

Re: Robin 295 engine
 

1 check fan is pulling air and air flow is not obstructed

2 check timing, if timing is off that can create heat and loss of compression.

3 does muffler flow good?

4 is engine trying to lock up

If you rebuilt the engine and only have 100 psi compression, there is an issue.

Re: Robin 295 engine
 

I think gearhead nailed it....timing belt is off a cog.