RC-Monster Forums - View Single Post - Dynamite .28 Big Red - Only Starts with HIGH IDLE and runs for about 20 secs

Thirdgen89GTA · 01.05.2012, 04:03 PM

I had a new Hyper .21 8port that had a cracked piston from the get go. Manufacturing defect I'd guess. Did the same stuff. As soon as it would warm up it would lose compression and stall unless it had a very high idle.

But check for air leaks first. I'd recommend sealing the backplate and carb with a little AE Green Slime. Works well to keep the air leaks out.

Check the o-rings on the carb clamp bolt. There are two o-rings on either side of the clamp inside the bore.

Should checking for air leaks and glow plug issues not resolve your problem I'd tear the motor down and inspect the piston and sleeve for scoring. Its possible there could have been debris in the engine from manufacturing.

	(#4)
Thirdgen89GTA You can sleep in a car, but you can't race a house Offline Posts: 311 Join Date: Mar 2007 Location: Buffalo Grove, IL	01.05.2012, 04:03 PM I had a new Hyper .21 8port that had a cracked piston from the get go. Manufacturing defect I'd guess. Did the same stuff. As soon as it would warm up it would lose compression and stall unless it had a very high idle. But check for air leaks first. I'd recommend sealing the backplate and carb with a little AE Green Slime. Works well to keep the air leaks out. Check the o-rings on the carb clamp bolt. There are two o-rings on either side of the clamp inside the bore. Should checking for air leaks and glow plug issues not resolve your problem I'd tear the motor down and inspect the piston and sleeve for scoring. Its possible there could have been debris in the engine from manufacturing. 1989 Pontiac TransAm GTA, 5.7L LT1/M6 400rwhp+ Jammin X1 CRT Pro, MMM/1717, 6S Hyper One Seven 1/7th scale GT car, MMM/1717, 6S Hyper 10TT, MMP/1410, 3S TL Mini 8ight, stock, 2S