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New slow jets work wonders!

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andy_c101:
Today I fitted my new ("042 size, press in type) slow jets to my 550k3 & it has given 'Ceebee' a new lease of life.

Tickover is so silky showroom smooth now.

I should have done it years ago (instead of all that carb cleaner, solvent soaking, ultra-sonic cleaning)
I bought the jets from Sirius Consolidated Inc Canada (I got stung by UK Customs for VAT, but now I dont care)

I also reset all the carb float heights to spot-on 14.5mm, as measured at opposite end to the pivot (previously they were way out at 17mm!). My carbs are the Keihin 'PD'-type with brick-shaped floats.

I just reset the air pilot screw to 1&half turns out while carbs were apart.

Fitted the carbs back on (did it within an hour; warmed the air intake rubbers and lubed with WD40, then "massaged them into place"; I find a smooth-end screwdriver blade helps)
-then at first attempt with half choke she fired up and ticked over at 1500rpm, then after a minute of so pushed choke in, and sat there ticking over at 1100rpm!

- I used to have to juggle throttle and choke, with revs going up-n-down like a yoyo, till it warmed up.

On my testride I also found that she pulls much much better from mid revs; I think that float height might have made the fuelling a little lean(?)

So if anyone out there has ever had problem with uneven tickover, new slow jets is your answer!

A few images attached.

basketcase:
Hi andy_c101,
I`ve just bought a rebuild kit from a company in Japan, £31 all in!! It`s my next job. Like you I`ve tried all the other options and it still runs like a 3 legged pig!! Revs anywhere between stalling and 4,000....and that`s just at tick over. I`m not too sure about how to set the float height but I`ve got the Clymer manual so, when I find it out, I`ll have a read. I`m half way through a home renovation and the bike is buried in the garage. At least the battery is fully charged now, I can`t wait to dig the bike out and try to start it, it hasn`t run since september last year. And YES, I did remember to empty the float bowls, little use as the carbs are knackered anyway!!Cheers for the encouraging info, it sort of kick starts me into doing something when I read the tales on here!

Bryanj:
DON'T believe the Clymer if its a K3, set to 14.5mm

z1100r:
These 4's are incredibly sensitive to carburation - if you seek perfection. Its very difficult to get it spot on. The airbox doesn't help with its inconsistent restrictive shape, but when its all working well they really are so much smoother and nicer to ride. If I could think of a setup that would look cool I would fit a single carb I think and get rid of all the headache you get from 4 carbs.

Glad yours is now OK andy

andy_c101:
Yeah, I'm really pleased with the carbs now.
& what great weather over the weekend too; I was able to have some great runs around the lanes!

- just a slight squealing front disc to sort out (again!).
- any tips on that?

Andy C

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