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slowbow

Joined:

Apr 13

Posts: 5

slowbow says:

Cylinder 2 not firing

Got a 50k mile MK1 1200 Bandit - just changed the carbs for a set off a 10k mile model but cylinder 2 won't fire. There's a good spark, the float bowls are full and, with the air filter off i can see the the pistons moving OK. I checked the compression - all cylinder are similar at around 120psi. I know the carbs are the last thing i changed but i don't think its related to that - could it be a sticking valve? or is it something else?

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  • Posted 2 years ago (15 April 2013 16:28)

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jaffa90

Joined:

Mar 09

Posts: 8933

jaffa90 says:

Cyl 2

Welcome slowbow,was the bike firing on all 4 before the carb change?

If so is there a vacuum pipe connected to no 2 inlet manifold for the fuel tap?

Did you check all the pilot jets for blockages before fitting this carb? 

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slowbow

Joined:

Apr 13

Posts: 5

slowbow says:

cylinder 2

Hi and thanks. Yes it was firing on all 4. The vacuum pipe connects to number 3.


No, I didn't check the pilot jets - is that what it could be?

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jaffa90

Joined:

Mar 09

Posts: 8933

jaffa90 says:

pilot jets

work mostly up to 2/3000rpm,you should have checked them because even partly blocked will cause a weak mixture which you cannot afford with an air/oiled cooled engine.

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slowbow

Joined:

Apr 13

Posts: 5

slowbow says:

pilot jet

do you think carb cleaner will do the trick? or will it be a case of dismantling them and cleaning or replacing the jet?

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jaffa90

Joined:

Mar 09

Posts: 8933

jaffa90 says:

carb cleaner

won`t unblock a jet,remember you need 4 pilot jets 4 choke /starter jets and 4 main jets CLEAN & CLEAR.

I would fit an inline filter as well so you don`t get any crap from the tap. 

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slowbow

Joined:

Apr 13

Posts: 5

slowbow says:

thanks

for the help J90 - i'll go and check it out now.

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slowbow

Joined:

Apr 13

Posts: 5

slowbow says:

you were right jaffa

one of the jets was blocked - just going to refit them now - do you think i should clean the tank out

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smidget

Joined:

Nov 07

Posts: 2424

smidget says:

slowbow

Clean the whole fuel system, and fit an inline filter.

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bikedoctor4u

Joined:

Apr 13

Posts: 48

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