How to Change your Bearings - Page 3 - RCCanada - Canada Radio Controlled Hobby Forum
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Old 04-28-2018, 10:04 PM   #21
Digger1
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Re: How to Change your Bearings


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Originally Posted by nahashmi View Post
A helpful link. I might have to work on 2 of my engines but not sure what is the actual problem with them. One of them sounds OK so I assume bearings are alright. It does start up but does not respond to the needle settings. Gets too hot and then shuts down. At that time there is absolutely no compression that can be felt by rotating the prop. After it cools down I can feel the compression. Can anyone help me in understanding what's wrong with them ? What to do ?

Thanks.
Likely restricted fuel flow, dirt in carb jet, etc causing lean run and overheating. When overheated the head and sleeve expand away from the piston causing loss of compression.
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Old 04-29-2018, 11:48 AM   #22
Rod Kelln
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Re: How to Change your Bearings

Given the absence of a needle response, the first thing to do is clean the carburetor thoroughly. If you cannot get a rich setting, then there is fuel flow problem. Also, if you are not already using a low nitro content fuel, suggest changing to one. I had a Fox Quickie 500 engine that ran fine on 5% nitro, but at 15% it would overheat and quit running.
Since you have overheated it, be sure to tighten the head bolts to an appropriate torque. Also check that the backplate is tight and that there are no issues with the muffler pressure to the tank, etc.
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