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Discussion Starter #1
Hi everybody; I'm new to the forum, but have had the bike for a while now (second one, first one was stolen a while back). The question is has anyone installed a factorypro jet kit in a Ca. model Sprint (1996/Mikuni carbs). I have a set of Trident silencers/w baffles installed, K&N filter and installed the Factorypro needles (number 4slot) with 115-110-115 (stock is 105's) mains and new needle jets (emulsion tubes) & snorkles on both air chambers. Runs great above 6500 rpm but stutters at 1/8th throttle when crusing or light accelleration. (floats are set to 15mm). Also looked all over the forum and didn't find what I needed. :???:
 

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At 1/8th throttle, you are right at the point between the pilot jet and needles. You might check your idle mixture screws they should be 2 to 2 1/2 turn out. That is only if you are using #40 pilot jets (check the size and if they are clean). If you still have problems you may want to go to #42 pilots but only after the above doesn't work. If you go to the #42's you probably will have to turn the screws in a bit (trial and error). ...Jim

[ This message was edited by: Lone-Rider on 2006-11-28 15:20 ]
 

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Discussion Starter #3
The one thing I didn't check was what size of pilot jet was in the bike (I have the mixture screws turned out to 3-3.5). I know the Ca. models were a different set-up and was hoping someone had a little more info about them. I'll be taking the carbs back out this weekend and checking the pilots, also I made a mistake about my mains, they are 120-115-120.

Thanks for the reply Lone-Rider. :)
 

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You may be too rich already on the low end with mixture set 3-3.5. Is that possibe ? Mine was setup with the same California jetting although it appears to be a 49 state model. It was sold new at South Bay Triumph. I am running 2 turns with #40's @ 3,000ft. elevation. You are between 500-700 ft. so it'll be a little leaner.
 

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Discussion Starter #5
The running actually got better when I went from 2.5 turns but didn't cure it at 3-3.5. I also noticed when I reset the floats that they were originally set at about 13mm and I reset them at Factory Pro's recommended 15mm and was thinking if that would have made a difference. :???: :???:

[ This message was edited by: LaneSplitter on 2006-11-28 18:46 ]
 

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Changing float level will not have an effect on how the bike runs unless the floats are allowing fuel to overflow or the engine is starving because the float bowls are running dry under hard acceleration. Just need to set them to spec. Also make sure you have no vacuum leaks. Let us know what you find. We all learn from each other's experience.
 

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Discussion Starter #7
Lone-Rider:
are you running both snorkles or does your bike have one air chamber capped off. I have opened up the second air chamber and added the snorkle to it. I took the carbs back off this weekend and changed from #40 to #42.5 pilots, main jets are 120-117.5-120 and set the needles at #3 slot which has helped the stutter but still not quite right. I actually think I might still be to lean (still have a slight stumble when the throttle is snapped open from idle/ mixture screws are at 2.5 - 3.0 out/best idle).

Scott
 

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LaneSplitter:

Mine has no air box at all anymore. I got it from the original owner in 2003 with a single snorkle and 105-105-105 jetting. It had a K&N replacement filter in the factory airbox. I went to some very free flowing Micron slipons and it didn't want to run at all that way. I now have 3 seperate K&N's and 130-130-130 jetting. This setup give me good throttle response but I'm still lean above 8,000. I am getting ready to tear it down and change the jets again. I have the stock pieces on the shelf in my shop if I have to go back to that. ...Jim
 

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Discussion Starter #9
Well, after test driving it yesterday I capped off the right snorkle and the bike ran much better and throttle response was even better, so that is telling me that the jetting is still to lean. I will probably leave it like this until after the holidays and then remove the carbs again to install larger jets and also replace the filter box & intake boots since these are 10 years old (they are getting kind of stiff). :razz: :razz:
 

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Just shows how badly they have this engine choked down. My 130 mains are too lean without the airbox. That tells me it will flow the air if you can get the fuel to it. I would have sworn Dynojet made a Stage 3 kit for this motor at one time but, I haven't been able to find one. I'm going to see how far I can take it. I have all winter to sort it out. Getting to cold to ride much here and I have a nice warm shop to tinker in.

[ This message was edited by: Lone-Rider on 2006-12-05 14:33 ]
 
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