Poor low speed running.
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Poor low speed running.
I have a KR1 and it has a very poor pickup from tick over and hangs onto revs before returning to tick over. I can't sort it out and have tried allsorts. I thought it must be an air leak but have have checked the inlet manifolds and all joints, cleaned and checked pilot jets and carb insides. I've synched carbs and twiddled to the point of madness to no avail. It's all bog standard settings on carbs and no bike mods. Any help or ideas would be much appreciated by me, many thanks, Tony.
90 KR1S
90 KR1
BMW R1150GS
85 CBX750FE
90 KR1
BMW R1150GS
85 CBX750FE
- JanBros
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did you check the carb rubbers only visual ? if so, spray some start pilot or brake cleaner on them when the bike is running. if the engine runs faster when sprayed on, you have a leak
and not every engine is the same, even if it's all standard. I'd adjust the airscrew. be aware : with the PWK carb's, the screw is at the back and it controls the amount of air and not the amount of fuel like on most carbs (where the screw is at the front of the carb). So turning it in = less air = richer.
from memory, a KR1 doesn't need the airscrew to be opened a lot. I usualy start with only half a turn open - manual says 1 1/2 turn open.
and not every engine is the same, even if it's all standard. I'd adjust the airscrew. be aware : with the PWK carb's, the screw is at the back and it controls the amount of air and not the amount of fuel like on most carbs (where the screw is at the front of the carb). So turning it in = less air = richer.
from memory, a KR1 doesn't need the airscrew to be opened a lot. I usualy start with only half a turn open - manual says 1 1/2 turn open.
My ultimate goal is to die young as late as possible !
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The bikes in fairly reg use (got 3 bikes so I split the riding between depending on my mood or journey!). Checked all routing, lubed and double checked again! Driving me mad as it's spoiling an otherwsie perfect bike, got an KR1S too and that dosen't do it at all. Tony.
90 KR1S
90 KR1
BMW R1150GS
85 CBX750FE
90 KR1
BMW R1150GS
85 CBX750FE
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- Oil Injector
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- JanBros
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in case you haven't found out : you don't need to take out the carbs to adjust the air-screw's
just losen the clamps. turn the right carb to the right and you can get to the screw. turn the left one to the left, and go with a screwdriver under the frame-beam, and you'll just be able to get to it
just losen the clamps. turn the right carb to the right and you can get to the screw. turn the left one to the left, and go with a screwdriver under the frame-beam, and you'll just be able to get to it
My ultimate goal is to die young as late as possible !
- Howie
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Keep us posted on what you find Tony. The only reason I mentioned the cable routing was because my old Kmx use to do the same thing. I was scratching my head for ages until I realised the problem only began when I replaced the throttle cable with an after market one
And it only did it when in neutral with the bars turned to the left
A quick fiddle with the clip that held the cable under the tank & hey presto no more problem.
And it only did it when in neutral with the bars turned to the left
A quick fiddle with the clip that held the cable under the tank & hey presto no more problem.
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Sorted!! thanks for all your help. I screwed the pilot jets to 1/2 turn out and it runs like a different bike. It's lovely and crisp off the throttle and the revs instantly drop down to tick over again. Why couldn't Kawasaki manage to do that, the settings they advise (1 1/2 turns out) just don't work??? Thanks again for all the advice everyone.
Tony.
Tony.
90 KR1S
90 KR1
BMW R1150GS
85 CBX750FE
90 KR1
BMW R1150GS
85 CBX750FE
- Howie
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Well done fella =D>
Quite possibly when the bike was new, 1.5 turns out would be spot on but after 20 odd years things do wear/clog etc etc
I had the same prob with the kmx as you know but also with a customers 1968 BSA bantam, bloody thing seemed to reset itself every night.
So my customer provided a brand new amal & bingo
That was last year so the bugger will be playing up again by now, ker-ching
Quite possibly when the bike was new, 1.5 turns out would be spot on but after 20 odd years things do wear/clog etc etc
I had the same prob with the kmx as you know but also with a customers 1968 BSA bantam, bloody thing seemed to reset itself every night.
So my customer provided a brand new amal & bingo
That was last year so the bugger will be playing up again by now, ker-ching
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Re:
Blast from the past, I was searching about pilot air screw settings and found Jan's post above.JanBros wrote: ↑Wed Nov 16, 2011 11:50 pm in case you haven't found out : you don't need to take out the carbs to adjust the air-screw's
just losen the clamps. turn the right carb to the right and you can get to the screw. turn the left one to the left, and go with a screwdriver under the frame-beam, and you'll just be able to get to it
Going to save me alot of time and patience - last time I adjusted I did it the long way - going to try this way now.
Thanks Jan, Great information
I used to be undecided, but now I am not so sure.