I would think glow plug as well. If it works with glow on and not with it off...then the plug is likely worn out/defective.....

Also it could just be rich on the low end. Rich will often be solved by leaving glow plug heat on. This is one way to tell is a low end or transition problem is rich or lean.

A little rich on the low end could be the culprit.


Running it on the 15-8 with only 20/20 fuel at 8600 you are taxing the engine pretty good considering the higher temps you are running at. I would say go to a slightly smaller prop say 14-9 it will turn that easier. Or go up in nitro to help the 15-8 turn easier.

You want to run about 9400-9500 on the 110 you can venture to the low 9000's but I personally would not run it below 9000...This could be your heating issue. Some people think that if they take the cowl off it solves heating issues.... However you would be surprised how the cowl when flying on many models not all...would do a better job of directing air flow at higher velocity to the right spot to cool the engine. Sometimes the cowling issues will get way worse with removing the cowling. This also makes your model tail heavy....I don't know for sure as you didn't mention which model and I have no idea on how your cowling is cut to allow air in...


On my Pattern model the engine and exhaust system is fully enclosed. I actually have ducting inside to direct the air flow. If you remove that cowling the cooling issues get way worse.

At 88degs F where you are its not really a problem with cooling. You are getting hot if you are getting hot because of the higher load you are putting on the engine. Go to a lighter load and it will help you get the settings correct.


First off change the plug and see if it comes back in line. If not start by leaning the low end a little The idle adjustment screw is an air bleed screw. OUT or CCW is LEAN...


If you are more than about 2.5-3 turns out from full closed on the air bleed screw then adjust the regulator screw Leaner by about 1/4 turn increments. IN or CW on the regulator screw is LEAN.


Troy Newman
Team YS