where should I buy jets for XJ1100?

[tab1324]

Where's the best place to buy em? I'm having trouble with cylinders #1 and #3 and thought it must be spark but to no avail. It has to be carburation - the plugs are getting soaked. The only thing in the carbs I haven't replaced other than the slide daphragms is the jets - just cleaned them with wire and air. I figure at this point I'm gonna go all out and get new jets.

I just can't figure this one out.

Tom B.

[ratbyk]

I really don't think that the jets are your problem. The bike has run for about 25 years on those jets. Have you checked the compression on the 2 bad cylinders? Is there any possibility that the floats or needle and seats are your problem?(best bet)
If you must change jets you can obtain them from Mikes XS in Florida.
Ken/Sooke

[Jerry]

I get my Mikuni jets from the local shop or dealer. Differnce in price is less than the postage from another dealer. Prices range from $3.09 to $3.25 each from local sources.

[tab1324]

floats and seats

I've replaced the float valves and seats, along with the little screen thingy (very technical I know), repaired the slide daphragms, cleaned every passage way I can think of at least 3 times as well as all of the jets... I just don't know where else to turn. What about float height - what is recommended? I believe they're all at about 1" (25 mm) from the bowl flange if I recall but this was last year.

Tonight I swapped #2 and #3 plug wires to see if the coil or plug wire was bad and the problem didn't move..

It appears that I'm getting gas into the crankcase but I don't see how since I've replaced the needle valves and seats. Plus, last year before I replaced them, the gas actually poured out of the airbox, not into the crankcase - although some made it into the case...

Anyway - I think I have to try jets at this point.

I did take a very small drill bit and drill out the choke jets because they were plugged rock solid. I don't know if was only on those two cylinders ut after I did the bike would start and run by itself so I thought it was an improvement.

Rambling now I guess - just frustrated.

Tom B.

[chevy45412001]

tab

i've got about 4 sets of jets for the xj . that is if your running 4 filters and exhaust. I have 122.5/125/127.5/152.5. I have 4 of each. the 152's will not work way to big. but the others all had there turn with varying sucess in my scooter. I'm currently running137.5's and that is going to be changed in the next few weeks. They are a bit fat alsoLeaning towards a 135,next.

[ratbyk]

Tom, the carbs jets do not put fuel into your crankcase. A problem with the N/S, floats, float height or in stretch the petcocks but not the jets. The carbs on cylinder 1 and 3 have a problem shutting off the fuel flow into them. This is causing the wet spark plugs/miss firing and deluted crankcase oil.
Pull the carb bank back off the bike. Drain the float bowls. Invert (turn up sidedown) the bank of carbs. Try blowing into the fuel line that feeds carbs 1 & 2. Again, blow into the fuel line feeding carbs 3 & 4. Use just mouth pressure. If you can move any air at all (even just a little) then the carb N/S is not shutting off the fuel flow.
It has been my experience over the years when something like this happens after someone has done any service work on the fuel system that the problem is dirt on the needle seat not allowing the needle to shut off the fuel flow.
When you finally solve the problem make sure that you install inline filters.
Ken/Sooke

[Ken Talbot]

Tom - when you worked on the float valves (the brass body piece that is held into the bodt of the carb with a U shaped retainer and a screw) did you replace the o-rings, or is there any chance you might have damaged them when you put the valve body back in? This is not as obvious to see as damaged or missing rubber tips on the needles themselves, but it can cause the float bowl to become grossly overfilled and contribute to the extremely rich situation you are describing.

[tab1324]

I think it's the choke jets

I had drilled out the choke jets on 1 and 3 last year because of starting problems and cold pipes - then I had a dry cylinder. Now it's soaking wet. I compared the spray pattern of the drilled jets with non-drilled and it's a vast difference.

Tom B.