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seems to be on rich side

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seems to be on rich side

Post  collector1967 on Mon 8 Feb - 23:08

Getting t 80 ready for M.O.T soon , she seems a bit rich, splutters fron idle, air screw 3/4 out, any idea's please.

Thanks Ian

collector1967

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Re: seems to be on rich side

Post  JohnW on Tue 9 Feb - 1:36

collector1967 wrote:Getting t 80 ready for M.O.T soon , she seems a bit rich, splutters fron idle, air screw 3/4 out, any idea's please.

Thanks Ian

Standard setting 1 5/8 turns out. Start from there & adjust till it idles correctly you may need to then adjust the throttle stop screw

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Re: seems to be on rich side

Post  alibx11 on Wed 17 Feb - 8:29

Ian, if your bike's been sitting for a while it probably would help to strip and clean carb....

Mine would splutter a bit coming off idle when you tried to rev it and would splutter at about 1/2 way up rev range, had to strip it and found the main culprit was the emulsification tube that the needle slides in was blocked, had to strip the carb and knock it out and use carb cleaner to get the holes cleared.

My engine runs best with air screw at 1 turn out, also make sure the float level is correct, should be about 3 to 4mm below the bowl level.

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carb

Post  collector1967 on Wed 17 Feb - 8:49

Thanks for reply, where do i measure float height from, i have not looked at this, checked valve clearances, cleaned carb, new plug , i have noticed the choke don't seem to have any effect , will start without choke.

Thanks Ian

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Re: seems to be on rich side

Post  alibx11 on Wed 17 Feb - 11:29

You'll like this little trick...

You'll need a bit of clear tube, windscreen washer tube or go to your local pet shop and get some aquarium air tube like I use.
Connect it onto the bottom drain of the float bowl and tie or tuck it up along side the carb as in pic.
Turn the petrol on, open the drain screw and see how far up the tube it goes, should be at 3 - 4mm below the float bowl top.
If it needs adjusting its a pain to keep removing the carb and bowl and altering the height of the float tab but has to be done.




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float height

Post  collector1967 on Wed 17 Feb - 19:49

Wow clever stuff, my problem is my drain screw is chewed up, looks like i might need to buy a new bowl, will let you know how i get on, many thanks.

Regards Ian

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Re: seems to be on rich side

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