I have a exceed nitro 1\16 scale and i can't seem to keep it running more than 5 minutes at a time to break it in. the first start runs the longest than after that i may start for 30 seconds.I'm getting smoke and raw fuel out of the pipe,is it getting to hot,I don't have a thermometer
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break in and tune problem
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MotoGod
Hardcore RCTalk User
Get yourself a temp gauge. It's important for break in, but not so much for tuning.
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Since you're still in the break in, I hope you're running it slow. If it's spitting raw fuel while it's idling, you'll need to lean the LSN slightly.
Always allow it to warm up slowly while driving in slow circles. Don't be punching it for performance. It's not ready for that yet.
Always allow it to warm up slowly while driving in slow circles. Don't be punching it for performance. It's not ready for that yet.
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I havent even tried driving it just trying the run a tank letting it sit up on a box. should i not have any fuel coming out of the tune pipe? when it stops running i can also see bubbles in the fuel line coming out of the carb twards the fuel tank?not fully primed?
Metalhead Matt
RCTalk VIP
Drive it. It's loading up just idling. Drive it easy, keeping the temps between 200-220. Shut it off every 2-3 minutes, put the piston to bottom dead center, and let it cool off. Start and repeat. Do this for 5 tanks or so. You'll be able to start leaning it out after 5-7 tanks or so.
MotoGod
Hardcore RCTalk User
There are 4 billion ways to break in an engine....and they are all right. The basic idea is get some heat into it....let things expand....let it run for a little while....then let it cool. Whether you drive it...idle it on a starter box/workbench or what have you. You just need to give it time to wear in the piston to the sleeve before you go and try to have it turn 25K+ RPMS as you rip down the street/track.
I let mine idle on the box for 4-5 tanks, doing 2-3 heat cycles per tank of fuel. After tank 2 I started to add a little throttle up to @ 25%, next cycle I went to 50% throttle,...then 75...and finally full throttle blips. After tank 5...I tossed it on the ground and drove it for a few more tanks easily to get close to a base tune on it. A few more tanks...I race tuned it and went for it....
If you use the idle method, you will have to lean the low speed needle to get your temps up, but don't go nuts with it. Get it to @ 220-ish after a few tanks and don;t go much higher for break in. You just want things to expand and loosen up a bit. If you do lean the LSN, make sure you richen it up before you drop it on the ground and start driving it though.
Break in is an art form...and a pain in the rear all at the same time!
I let mine idle on the box for 4-5 tanks, doing 2-3 heat cycles per tank of fuel. After tank 2 I started to add a little throttle up to @ 25%, next cycle I went to 50% throttle,...then 75...and finally full throttle blips. After tank 5...I tossed it on the ground and drove it for a few more tanks easily to get close to a base tune on it. A few more tanks...I race tuned it and went for it....
If you use the idle method, you will have to lean the low speed needle to get your temps up, but don't go nuts with it. Get it to @ 220-ish after a few tanks and don;t go much higher for break in. You just want things to expand and loosen up a bit. If you do lean the LSN, make sure you richen it up before you drop it on the ground and start driving it though.
Break in is an art form...and a pain in the rear all at the same time!
