re-jetting needed?

[K2-K6]

Will the choke lever lift those choke gates right up out of the inlet path? They should dissappear completely up into the carb body when not is use.

[Greebo]

I've started by removing the carbs as i wante to give it a clean anyway, put the 122 jets and drop the needle by locking it on the top slot, (see pic)
Not sure if should be the way around.
Hopefully I'll receive a confirmation before mounting it all back and do a timing check.
Thanks
el__burro

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I would have thought that dropping the needle would be defeating the object of having the larger jets for the more top end that you are trying to achieve, when increasing my jet size to 138 I also lifted the needles in stages, it only started running right when I got the needle clip on the 5th notch which increases the fuel to the Max, mine does run slightly rich but they do run better that way, not a good idea to run too weak 

[El__burro]

Mine was very rich on the 2nd  (from bottom) so i went all the way up. Unfortunately i am struggling with setting the timing right. With strobo light doesn't pick any pulse on cylinder 1, ok on 4 and 2/3.


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[Bryanj]

That suggests a weak spark on 1

[El__burro]

After a short test ride it felt like starving on fuel so i lowered by one the clip on the needle.
Getting slightly better but still struggling.
Plug one gets quite carbon fouled but the rest look ok.
Thanks
 el__burro

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[Greebo]

After a short test ride it felt like starving on fuel so i lowered by one the clip on the needle.
Getting slightly better but still struggling.
Plug one gets quite carbon fouled but the rest look ok.
Thanks
 el__burro

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"Being starved of fuel rings a bell",I had the same problem when we finished the build on my bike even with the larger jets, so we kept lifting the needle until it ran right, with my bike it would only run right with the needle in its highest position.

[El__burro]

...the needle in the "highest position" did you put the clip at the bottom of the needle?
Thanks
 el__burro

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[Greebo]

...the needle in the "highest position" did you put the clip at the bottom of the needle?
Thanks
 el__burro

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Yes on the last notch at the bottom... try it on the last notch & then if it runs much better check the plugs if they are too rich lean them off on the air adjuster screws, on your carbs to weaken the mixture the screw turns out anti clockwise

[El__burro]

Thanks,
I hate having to adjust the needle (is there a quicker way than removing it all apart?) but hopefully it will be worth it.
Thanks a lot
el__burro

[Greebo]

Thanks,
I hate having to adjust the needle (is there a quicker way than removing it all apart?) but hopefully it will be worth it.
Thanks a lot
el__burro

Yes its a pain in the arse on most carbs, but a much more awkward job on the PD carbs, yours are the earlier carbs so it should be a bit easier to do...hopefully

[El__burro]

I have lowered the clip so the needle lets in more fuel, unscrewed the air fuel mix until the plugs were not wet, started the engine, in neutral.. low revs sounds ok, high revs struggles to go.
Then put first gear in to go but it's a struggle.
Not sure about my strobo light, I'll try timing with the static method.
Thanks
el__burro


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[Greebo]

 it should be getting enough petrol through now, I suppose it could be electrical, but the timing would have to be a mile out to make a big difference. what about the coils ? have you checked them or the HT leads ?

what you described earlier was just how mine was on the first few runs after the build & we were not sure what is was at first, but on one run whilst opening the throttle it started the usual jerking & missing so I decided to pull out the choke whilst riding it, as soon as pulled the choke out it pulled away as it should, no missing or jerking, that's when I knew it was lacking fuel when on the throttle, adjusting the needles did the trick

[El__burro]

I have static timed it, pulled the needle all the way up, checked the points gap, reser the bowls so they are even, cleaned the plugs, coils ok... still struggling.
I'll try pulling the choke on my next ride.
Thanks
el__burro


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[totty]

"strobo light doesn't pick any pulse on cylinder 1
Plug one gets quite carbon fouled but the rest look ok."

I'd sort this first. Sounds like you've got a plug, cap, or lead problem.
After that get the main jets right for full throttle, leave the needles alone until the main is sorted. You will need a range of jets in order to find the correct one, you can't tell if you're got it near ideal or not in just one step, you have to see the effect of going a step or two either direction.

[El__burro]

I have checked it all... spark plug, gap, still 1 and 4 very carbon dry.
Dropped the needle on the 3rd hoping to get better results but... no.
When i rev i have black smoke coming from exhaust 1-2.
Going crazy.
el__burro

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