rjd

I have been running a Saito 125A for over a year and was very satisfied with it until a week back suddenly no compression… found that one valve spring on the rocker arm was stuck... touched it with a screwdriver and it came into place... What caused that to happen...? Anyways had 5 flights after that and all well.

Yesterday, tried to start it up, same problem and same solution.

Has anyone one faced a similar situation, any suggestions what needs to be done?

Thanks.

nitro wing

My Feedback: (1)

are you oiling the motor and or running dry it dry after using?

juanjulian

My Feedback: (9)

Yes the exaust valve gets carbon deposits and sticks.

You need to take out the cilinder and take notes of all parts and position. Release the valve retaining ring and push valve inside cilinder being carefull not to scratch iside wall. Since it has carbon depisits probably wont like to come offf.

Once you have the valve outside use the dremel tool with the wire brush accesory to eliminate all carbon deposits. Be carefull with the part of the valve that seals with cilinder. Assemble your engine and should be great again. That is why they recomend sintetic oil only in your glow gas for this engines.

Cheers

Juan

rjd

Have been using synthetic oil.
Will try to clear the carbon deposits if any.
Thanks for the feedback,
Cheers!