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mikuni carb prob

  • Thread starter Thread starter mouse
  • Start date Start date
M

mouse

Guest
hi
please help :eek: before i pull out the remaining hair i have :o
my 1979 gs850 running the original mikuni carbs VM26SS (i think ) will not run without choke as soon as i push the choke in its like hitting the kill switch the engine dies instantly.:(
 
Okay, it won't run without the choke because your carbs are clogged.

More info is needed.

New project bike?

Was it running?

Have you supposedly cleaned the carbs?

Replaced O rings?

Intake boots?

Did you go to the VM carb cleanup page and do all of that and more?
 
In my best W. Shatner....."We......need......more......info....."

If this bike is coming out of a deep sleep the first two things that are req'd, IMHO, is clean the carbs and adjust the valves. While your learning and accomplishing these two maintenence items, you'll learn alot more about your bike and what it needs. Use the search feature and read, read, read. And check this out. http://members.dslextreme.com/users/bikecliff/images/vm_carb_rebuild.pdf

And welcome !!!!!:)
 
hi the bike stood for 18 month ish
ive cleaned the carbs with loads of carb cleaner.
ive also just fitted new piston rings and got the compression back upto 150 psi in each pot .
i have also fitted a boyer electronic igniton system new plugs new leads.
 
mouse said:
ive cleaned the carbs with loads of carb cleaner.
Click to expand...

Can you squirt carb cleaner in the pilot circuit and have it come out the openings on the other end?
Are all the holes in all the jets clear?
 
Could be somthing silly like you haven't adjusted your slow run high enough. When on the choke, open the throttle a bit and switch the choke off - if it runs that could be the (very simple to cure) problem.

However, I suspect you've done that, in which case it's clogged jets or passageways in there somewhere - you need to be really scrupulous with the cleaning and check everything is completely clear before re-assembling. If you've got eyesight like mine invest in a magnifying glass - I bought one last year, a great investment at 99 pence!

I guess you've also got the airfilter plumbed in? If not she'll be running way too weak and cut out. Similarly if your carb to head rubbers aren't 100% you'll have the same symptoms (plus the rubber O rings need to be in good shape as well).

Whereabouts are you over here by the way - worth popping it in your signature as you might have one of us just around the corner. And welcome to the nuthouse.
 
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