bogging

[GARTHXS]

so im tuning my 78e and it seems to bog a little bit from about 1100 rpm to maybe just under 2k if you know what I have been up to on this bike than you already know I have 85 fj1100 carbs , mikes xs pods and bassani superbike 4/1, do you think its the lack of advance , no velocity stacks or what ?? power comes on at 2k and doesnt stop pullin until I get chicken. will it work if attach the vacuum advance to the second carb boot with an inline restrictor??

[CatatonicBug]

Wow... That's a lot of change to take into consideration. I know nothing about the other parts, so I can only say that if you were still running the stock setup, I would look at the pilot jets/circuit. Sounds like it's not getting enough fuel till the main jets kick in at the higher RPMs.

[GARTHXS]

yeah

Wow... That's a lot of change to take into consideration. I know nothing about the other parts, so I can only say that if you were still running the stock setup, I would look at the pilot jets/circuit. Sounds like it's not getting enough fuel till the main jets kick in at the higher RPMs.

the only thing constant is change and mine is due to lack of stock parts available oh yeah and money too plus it looks and sounds cooler

[3Phase]

Garth, I know what you mean. Has the bike been bogging since you put on the new carbs back, when, around the time we made the casino run or is it more recent?


Regards,

Scott

[GARTHXS]

maybe

Well I have tuned them it a bit more and it is probably just a little bit more tuning needed, also I am really thinking of velocity stacks and I think part of it is the f/d mod and the taller gears

[petejw]

Garth,
Im running the air stacks with uni pod filters,
makes a nice difference up top but wont make any difference to your off idle stumble, play around with the mixtures a bit more, you could also try stretching the slide springs a quarter inch to slow the slide down a whisker.
I also dont think the advance would contribute to it either.

[3Phase]

Well I have tuned them it a bit more and it is probably just a little bit more tuning needed, also I am really thinking of velocity stacks and I think part of it is the f/d mod and the taller gears

Have you checked the new carburetors to see what size jets are in them? The Yamaha site says the '85 XJ1100N has BS36 carburetors with #37.5 pilot jets. That looks a tad lean in the low speed department.

Lakesreach has a PDF with carburetor specs.


Regards,

Scott

[Cobia]

Garth,
It sounds as if you're experiencing the same thing I was on my XJ. Here's the thread of how I solved it:
http://www.xs11.com/forum/showthread.php?t=22129

Hope it helps.

[GARTHXS]

pilots

I have 120 mains and 42.5 mains I believe and I do have adjustablity with the mix screws

[dbeardslee]

Garth - soft and boggy on the bottom is often a sign of float height being too high (in their installed orientation). Don't know a lot about the FJ carbs, but this is common for CV carbs. Might try lowering them 1-2mm - doesn't cost anything. Also, I've found a colortune an indispensible tool in determining jetting. If you can't adjust through the entire range of color (yellow, bunson blue, white blue) it's generally an indication that the jets aren't right. Here's some useful info DGXSER just turned me on to - CV Carb Tuning

[GARTHXS]

mix

I think I am almost there with the pilot mix just need to do a couple of chops and see where I stand , put in a tankful of gas and added some seafoam havent done that in like six months so I figured I was due and she seems to run pretty good but maybe I am a perfectionist (haha) also I think with pods 4/1 and the 750 mod it doesnt pull as hard from down low as a stocker