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Old 07-27-2005, 05:52 PM   #1
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Default help with 1/8 scale buggy

hey guys, i posted a while back, near the end of june. we had some trouble with my kyosho mp 7.5 sport. heres a link to the post.

http://www.rctech.net/forum/showthre...34#post1662934

we couldnt figure it out. when ever it did start, it would die. so we left it at a local hobbie shop, debbies r/c world. they said there was a problem with the clutch and there was a lack of compression. they installed a new clutch, and instead of payin big $$ for a new piston and sleeve, we shipped it out to Ray A racing, and he refurbished it for cheap. it now has good compression, a good clutch, so the engine was in pretty much new shape. we were tryin to break it in, with the factory settings, and it starts 1st pull, but as soon as u barely touch the throttle. it dies. every now and then, it runs for a little while, and dies. were not goin full throttle, because its still the 1st tank of break in. we installed everything right, the piston and sleeve is right, th4e glow plug is good, and everything else os on the money. we just cant figure out what is wrong with it. i you guys know anything that can help, please, it would be greatly appreciated.
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Old 07-29-2005, 10:02 AM   #2
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This is the exact problem im having now. I can't really say much on this topic besides fixing all airleaks if your engine suffers from any.

Sean
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Old 07-29-2005, 06:14 PM   #3
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Is it spitting fuel out the exhaust?
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Kyosho USA,Bruno racing
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Old 07-29-2005, 08:39 PM   #4
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Do you have a proper glow plug? Double check your needle and idle settings? Maybe swap out the carb for another to see if that's the issue. Try a different, fresh fuel.
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Old 07-29-2005, 09:46 PM   #5
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Quote:
Originally Posted by Kanai II
Is it spitting fuel out the exhaust?
Yes it is.

Sean
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Old 07-29-2005, 09:53 PM   #6
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Quote:
Originally Posted by Team Duratrax
Yes it is.

Sean
Sounds like it's really rich then.
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Old 07-30-2005, 04:50 AM   #7
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i agree. i had my piston and sleeve refurbished as well and i didn't really need to break it in because it wasn't too tight. try leaning out the low and high speed needles a little at a time to get it running then keep an eye on the temps. is the plug good? did you seal the backplate, the back of carb screw, the neck of the carb and the ends of the carb boot? these can all leak air and cause engine trouble. that would be my next step if leaning it out doesn't help.

adam
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Old 07-30-2005, 04:40 PM   #8
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we swapped out the glow plug, that helped. then we messed with the seetings, and it helped a lil more. but it still wasnt right. we took it apart, in hopes of finding something, but theere was nothing. when we put it back together, it worked like a champ. i have no idea s to what we did, but for alll i know, it could have just been an air leak. thanks for all the help guys.
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