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Won't stay running...

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obelisk79

RC Newbie
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Hi all,

New to the forums here and semi-new to nitro cars.

I have an old Kyosho Pureten GP MKII World Cup edition car with a GS11R .10 engine. I've had this thing since 2002 ran it a few months for fun and then let it sit for YEARS until a month ago I decided to restore it for my 3yr old's enjoyment (he loves cars). I've ironed out most of the issues it had but I can't keep it running.

Back-story

the muffler pressure line fitting on the muffler was split length-wise and I couldn't connect the tubing to it. Being the industrious do-it-yourself-er that I am, I decided to try and fix it. I dremeled out the nub and jb welded a brass barb of a slightly higher inner diameter in it place.

The engine will start, but peter-out before I can get the starter off normally. When I adjust the carb needle to be fully seated (instead of the 2 turns counter clockwise which is stock) it will keep running without the starter at half to full trottle but response is sluggish.

I suspect that I'm now over-pressurizing the fuel system and running the engine too rich, which would explain the carb setting and sluggish response. Can anyone confirm this and/or offer a solution to fix this outside of having to source a new muffler for an engine that is out of production?

I can attempt to take a video and upload it to youtube for anyone if you think it will help. I'll just need to know what you want to see in it before I make it.

-Joe
 
Last edited:
How big is the I.D. of your brass barb? Since you didn't change the orifice on the tank I really don't think this is your problem but you could splice in a restricter to test it.

Did you rebuild the carb with new o-rings or just clean it?
 
I think the barb was 1/8" ID which looking at it now is roughly double the diameter of the stock I.D. I have some nylon tubing that fits over the barb also fitted over a small length of the original tubing to connect everything to the tank.

I took the carb all the way apart and cleaned it thoroughly. I checked the original O-ring and it was in perfect condition, so I wiped it with some fuel to make sure it was clean and reinstalled everything. I do have some liquid gasket I keep for my car out in the garage, I could try and seal the carb, but I still feel like I'm feeding too much fuel into the engine.

Appreciate the help!

-Joe
 
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