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[turbobike] mixture clues

John Williamson (john.williamson5@virgin.net)
Fri, 26 Nov 1999 13:14:58 -0000 

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Regarding the R1 mixture prob.

Without a gas analyser, or a dyno, (I have both!) you can easily tell if =
something is going massively rich or weak.

Rich will give at the time of the obvious problem:
1.black exhaust smoke
2.cool engine
3.loss of 1 or 2 cylinders (you can feel the regular misfire)
4.If you pull the clutch and snap the gas shut the engine will stop or =
struggle to run as its loaded with fuel for a sec or two.
5.sooty exhaust
6.black or sooty looking plugs
7.smell of fuel (bystander)
8.worse when bigger main jets or choke on or hand over intake or =
whatever

Lean at time of problem:

1.pops bangs and crackles
2.hot motor
3.burned or whiteish plugs, with yellowish bottom electrode - plug chop =
immediately after problem!
4.pistons look white
6.clean exhaust gasses - visibly
7.bigger jets (lots bigger) a rag or hand over the intake allows it to =
pull through the problem (like a conventional choke)
8.burned valves pistons or plugs are also a slight giveaway..

A quick check of the above will get you going in the right direction, a =
the clues kind of add up.
Changing to a slightly bigger or smaller may not show much difference if =
its miles out though.
Once you get close then you need a dyno.

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Regarding the R1 mixture = prob.
 
Without a gas analyser, or a dyno, (I = have both!)=20 you can easily tell if something is going massively rich or = weak.
 
Rich will give at the time of the = obvious=20 problem:
1.black exhaust smoke
2.cool engine
3.loss of 1 or 2 cylinders (you can = feel the=20 regular misfire)
4.If you pull the clutch and snap the = gas shut the=20 engine will stop or struggle to run as its loaded with fuel for a sec or = two.
5.sooty exhaust
6.black or sooty looking = plugs
7.smell of fuel = (bystander)
8.worse when bigger main jets or choke = on or hand=20 over intake or whatever
 
Lean at time of problem:
 
1.pops bangs and crackles
2.hot motor
3.burned or whiteish plugs, with = yellowish bottom=20 electrode - plug chop immediately after problem!
4.pistons look white
6.clean exhaust gasses - = visibly
7.bigger jets (lots bigger) a rag or = hand over the=20 intake allows it to pull through the problem (like a conventional=20 choke)
8.burned valves pistons or plugs are = also a slight=20 giveaway..
 
A quick check of the above will get you = going in=20 the right direction, a the clues kind of add up.
Changing to a slightly bigger or = smaller may not=20 show much difference if its miles out though.
Once you get close then you need a=20 dyno.
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