hi all Having problems with my 3ln1 running a bit rich. My last tank of petrol only lasted 130kms and you can see the white smoke coming out the exhaust when you give it a good rev. Its burning way more fuel than it should but runs fine once its started but can be hard to start initialy. It idles fine also. I've been told that the jet needles and emulsion tubes wear out and its pretty clear that mine are worn. Next comes the problem. I purchased a second pair set of carbies that are in far better condition than mine but when I put them on the bike it wouldn't run without the choke on, Idled up and down and stalled when you turn the throttle. After removing them and cleaning them I found that the idle mixture screw was 2.5 turns and the jet needles were on clip #3. On my old carbies they were on 3 turns out and # 2. After adjusting the new carbs to the specs of my carbs the bike would'nt start and after I put them back to the condition I got them in the bike wouldn't start. Just wondering if anyone else has had to replace these or knows how to help as I am really trying not to have to order the parts from japan. Any help would be great.
oh yeah and my valve clearances are fine as they were just checked and my cam chain replaced as it was stretched.
I'd hazard a guess that the connections are fouling your new carb set-up. messing with the carbs on old bikes introduces more probelms than it solves from what I;ve heard - the rubber hoses which connect the airbox to the carbs and also the rubber diaphrams usually have some wear and any air leaks introduced when you fiddle around with them can cause havoc with the fuel/air delivery. i'm not a mechanic and don't really have much to back this up but thats my gut feeling. Make sure you have the rubber boots sealed well over the the new carb intakes and check for any air leaks. I can't see any other reason why the new carbs would spaz out so badly.
With carbs it is time and patience that saves the day. It would pay to clean out the new carbs in carb cleaner. Make sure that there is nothing siezed in the moving parts (needles), float needles not worn, float levels ok. Make sure carbs are sealing on the boots. You can check if the carbs are not getting fuel or have blocked jets by putting a decent squirt of petrol down each carb throat and trying to start the engine, if it runs for a few seconds when you start it, its not getting fuel. Have a look at the "how to" section on carb repairs.
Hi Scatters, After completing what Dave said. Stcik to your original carbies becasue you know that they work. Adjust pilot screws to 2 7/8 turns out. Jet needles on clip three. Slightly open the exup valve a little. Put new oil in it and clean (soak in hot soap water) or replace the air filter. My bike was just like yours and burning way to much fuel. I now get between 170 to 180K's out of a tank. The white smoke is to much fuel or old oil not doing its job. Best of luck, let us know how you went.
Had mine running a little rich aslo, it's a fzr thing i hear, i moved the needles to #4 (back from the point) a huge difference in fuel consumption and no loss in power...as for the pilot screws I believe its in for leaner, out for richer
thanks for your help guys. I've got it running better now as I put the needles on second clip from the top and the air screw on 3 turns out. I stuck with my carbs as I knew that they worked but I changed the emulsion tubes and needles to whichever ones were in the best condition from the two carbs. I didn't muck around with anything else as the bike ran fine until the needles started to wear out more. I was told by my mechanic and by an importer that these bikes ran very rich from the factory and it is common for the emulsion tubes and needles to wear out in the 3ln model. Good news on the other hand is that to get the neddles and emulsion tubes from japan they are $50 bucks each so for 400 hundred dollars to fix the problem(+2-3 weeks for bloody shipping!) its not too bad considering that if you find a second hanbd set of carbs from a good runner your looking at a couple of hundred any way. The joys of a grey import!!! Can't wait until the end of the year when I can get my R6!!!
I would say item 23 in the bottom left drawing in this post <!-- m --><a class="postlink" href="http://fzr250.com/viewtopic.php?t=2977">http://fzr250.com/viewtopic.php?t=2977</a><!-- m -->
