UK Karting - Notice Board (2-Stroke Karting) : Re: Strange top end issue.

Notice Board (2-Stroke Karting)

Re: Strange top end issue.
Posted by 'bt3962' on 30 Oct 2014 @ 03:11

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bt3962Joined: January 2002
Total Posts: 12
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The lifting off and then throttle back on giving power is classic of weak full mixture.

I am assuming you are talking about a TKM BT82 extreme.

Drill a small 3 mm. hole in the screw top of the (overflow) expansion tank or even remove the screw top. This is sufficient to allow unrestricted fuel flow. Check this by running fuel out of the pipe that connects to the carb. It will be obvious if fuel flows well enough.

If the tank is top feed the pipe in the tank must be free to swing inside the tank with a metal weight on it, and at least 2 cms. from the bottom of the tank. Fuel pipe swells and lengthens in the tank when constantly immersed in fuel. If not even with a nearly full tank the pipe will stick one side of the tank and surge away from the pickup especially on long corners. The corner may be some distance from the surge point as the fuel pipe contains fuel for some distance before the air that has been drawn into the pipe gets to the carb.

In spite of what it says in the Talko TKM BT82 'manual' The best settings for the carb. is low (T bar jet) 2.5 turns less 5 minutes and 10 minutes open for the high jet. These settings have won multiple Super 1 races and finals without engine failure. The 100cc junior TKMs run pretty much the same.

I have run (only briefly) BT82 without one of the crankshaft oil seals. It ran but not well, poor starting. Your crankshaft oil seals should not be an issue after 6 hours but are simple to change without dismantling the engine.

You can also rebuild the carb. with the diaphrams the wrong side of the gasket and it will still run.

Pi$$ poor fuel supply leads to pi$$ poor performance.

Message Thread:

Strange top end issue. by 'basssound' (29 Oct 2014 @ 20:48)

Re: Strange top end issue. by 'christkm' (29 Oct 2014 @ 21:28)

Re: Strange top end issue. by 'basssound' (29 Oct 2014 @ 21:30)

Re: Strange top end issue. by 'christkm' (29 Oct 2014 @ 23:14)

Re: Strange top end issue. by 'bt3962' << You are here!

Re: Strange top end issue. by 'basssound' (30 Oct 2014 @ 7:22)

Re: Strange top end issue. by 'nitch' (30 Oct 2014 @ 8:36)

Re: Strange top end issue. by 'nitch' (30 Oct 2014 @ 8:58)

Re: Strange top end issue. by 'PaulMRotax' (30 Oct 2014 @ 7:20)

Re: Strange top end issue. by 'Bucky' (30 Oct 2014 @ 9:48)

Re: Strange top end issue. by 'MaxRacewear' (30 Oct 2014 @ 13:57)

Re: Strange top end issue. by 'basssound' (30 Oct 2014 @ 16:43)

Re: Strange top end issue. by 'MaxRacewear' (30 Oct 2014 @ 18:11)

Re: Strange top end issue. by 'MaxRacewear' (30 Oct 2014 @ 18:12)

Re: Strange top end issue. by 'basssound' (30 Oct 2014 @ 19:03)

Re: Strange top end issue. by 'basssound' (02 Nov 2014 @ 8:41)

Re: Strange top end issue. by 'basssound' (05 Nov 2014 @ 15:27)

Re: Strange top end issue. by 'buzzinrussell' (05 Nov 2014 @ 15:45)

Re: Strange top end issue. by 'basssound' (05 Nov 2014 @ 16:17)

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