Project Grasshoppers FZR 3LN3

Did a little drilling to make another slot, and got the pilot screw out. Thanks @Murdo for the offer, I was thinking of you... Cleaned it all up, sprayed a little Inox, and was able to adjust it out 2.5 turns, as I did with the others. It was just seized - the spring, washer and o ring are all there. Bike is not running as rich, and I can now fine tune, but I have other issues. Firstly, it floods - when you stop at the lights, or after its been sitting, it starts but won't rev. This has always happened since these carbs have been put back on. If you wait 20 - 30 secs and slowly ease throttle back, it comes good and off you go - so that needs fixing. Also, it's now sometimes running rough when you accelerate - not sure if this is carb related or electrical. It's almost like when you have bad HT leads, and then all of a sudden it comes good again and flies... need to put other carbs back on to see whether its carbs or something other. Anyway, I'm gonna rebuild a set from scratch...

 

So the pilot screw adjustment hasn't stopped the flooding? The rough running is too much fuel I think. Reckon you will need to look at the main jet sizes

 

No it did not. I think there is a prob with this set of carbs... I think it's just a fault that needs to be fixed... I have noticed others on you tube with this problem on FZR's, it's something to do with the idle circuit.. more head scratching/research needed... Not sure what the rough running is either.. could be anything

 

Maybe, maybe not.. we'll see...

 

Yeah, I know it's confusing. Grey was using my carbs on his bike, and they seemed to work... But, my experience is that when on my bike, it seems to flood after starting or at the lights, and you have to hold the throttle a little above idle (otherwise it stalls - you call it chugging problem).. and eventually it comes good and takes off... this was the case before, during and after going to Sydney. On the way to Sydney, I was only getting 100 - 120ks before hitting reserve, and hence we thought its running rich - as well as the smell.. That's when I started tweaking the Pilot jets... the chugging problem remains... Note: I was using a spare set of Grey's carbs before, and no chugging problem.. the only prob with those carbs is it was very hard to start the bike, but once started, seemed to run fine but with fast idle...

 

Hmm... one thing I noticed with my bike is there's a little air hole inside the chamber of the carb on the side near the pilot screws. At the time I didn't investigate where it went but 3 out of 4 of mine were blocked. When I put the Litetek kit in I cleared these up, it was still flooding until I took the pilot screws 2.5 turns out now it's sweet as. Not sure if this helps.

 

Is this the case? That would be pretty good if they were. I read on there that worn emulsion tubes and/or needles can cause too rich at low revs.. but I guess the experienced guys here would know that...

 

^^ forget me, I just realised the carbs worked fine on another bike, which cancels out that argument.

Your problem may be airflow then. Tried cleaning out the air filter? If it's definitely not the carbs your fuel/air mix could be too rich and you're choking her up a bit.

 

Yeah, as Grey alluded to, may have the wrong jets etc. in here.. that's why best to build up a stock setup and go from there.. I have a nagging feeling though that there just may be another issue with the carbs... it comes and goes like in cycles... Air box is stock and has been cleaned.

 

Well every bikes different, why not lean up the needles? Or have you already tried that?

 

Yeah, I had a look at one of the needles, and it was set to 2nd from the top... just at the stage now to try different stuff, but I might just do a rebuild anyway like you did... might attack it with Grey when he gets back..

 

Check for emulsion tube wear... more info here http://www.factorypro.com/tech/needle_jet_wear.html

 

Did you look at all of the needles? 2 of mine were set 2nd from top, the other two 3rd from top. All are now 3rd from top and mine is still popping a bit with excess fuel so I may lean it up a little more by taking all of them up a notch.

 

Yep, that's why we'll just rebuild the sucker properly!

 

Could it be the chokes bleeding, I had to replace the springs as 2 were rusted out & not closing the valve.