Hi guys,

I just want to ask what has happened to my mc18. I just had a top end rebuilt but when I run it again there seems to be more oil in the top cylinder than the bottom because to give sh*t loads of smoke. what should I do? is there an adjuster in the oil pump to control the level of oil in each cylinder? and how many turns must the pilot screw has, I have original pipes and jetting and air filter. please help guys.. thanks..

it common for them to smoke more out of one pipe just check the oil pump cable setup

Nothing to do with oil, it's usually because one cylnder is jetted correctly so is burning all the mixture, and the other is too rich (or not sparking fully) and some of the mixture is not burning in the cylinder but getting very hot in the exhaust so appears as smoke.

What colour are the spark plugs?
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Last edited by Dave Ett on Sun Sep 24, 2006 5:40 am; edited 1 time in total

what do you mean about the spark plug colours? I use Denso W24's I can find the recommended plug W27 plugs denso's.


how many turns that the pilot screw in a stock bike? 1 1/2 ? 2? I really dont know.

Have a read through the tuning and workshop sections of the site, it contains loads of usefull information like this:

"Remove the spark plugs, and check the colour of their respective electrodes, noting which cylinder each plug came from. They should be a light tan colour if your settings are good. Too dark, or black, and it's rich, if the plugs are grey you are too lean, and if they are near white, you are dangerously lean!!"
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MC21SP Plaything
BMW F800GS Bumblebee
Triumph 9551 Daytona Big boys toy
FJ1100 Sporting relic
GTS1000 oddball

its black.. and a little wet. plus the problem get worst.. now it wont start and it smells gasoline all over it..

Did you do the reading? All the info you need is there, and Andy put a lot of effort into it, so I'll refrain from repeating what's already available!
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MC21SP Plaything
BMW F800GS Bumblebee
Triumph 9551 Daytona Big boys toy
FJ1100 Sporting relic
GTS1000 oddball

http://www.nsr-world.com/tuning/250-tuning/carburation%20index/

Thought I'd help in your task Dave

Like Dave said, all the info is there if you read though.
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If I have to take the carbs off once more...

Why is it not possoble he has a ring or oil pump problem?
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james
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I cant have a ring problem cause I have a brand new rings. I also think its a carb problem. I'll read more into the article. thanks guys.

j911brick wrote:Why is it not possoble he has a ring or oil pump problem?

The oil pump feeds to both cylinders, and the only failures that can occur can only cause a reduction in the amount injected: Pump failure to both cylinders, or a blocked / split pipe to one. Either would cause siezure.

Having just had a top end rebuild, I discounted rings.
_________________
MC21SP Plaything
BMW F800GS Bumblebee
Triumph 9551 Daytona Big boys toy
FJ1100 Sporting relic
GTS1000 oddball