Anti-Throttle bog products which actually works?

[infantry317]

Ok I've seen three products for YFZ throttle low-end bog:

Boyesen Quick Shot 79.95
Scary Fast Power Now 99.95
FCR Pump Cover 59.99

What actually works? I've heard good and bad on the Quick Shot.

EDIT: try a smaller leak jet if you are having troubles, there is a good article over at ***central.com

GOOD LUCK!

[GPracer2500]

No need for any of those things. Your accelerator pump is adjustable. A smaller leak jet would be the place to start.

[infantry317]

a buddy mentioned that, but I don't anyone that's tried it.

i have tried it on my honda 450r with fcr...it worked wonders for the bog...and it was a hell of a lot cheapert han any you mentioned

[infantry317]

You were correct GP! It was $10 and really helps you when chugging around where it would have killed before and accelerates quicker. :D

[quadgeek631]

what size leak jet did you put in it?

[oldskoolex400]

yea, i need to know too man

thanks

[TWILES]

I was told that worked on my WR too but the guy who told me about it said that I didn't need to completely close off the hole. Just a smaller jet.

[infantry317]

its not closed off, just a smaller leak jet that Yamaha offers for that carb

[250xcheetah]

do you get the jet straight from yamaha?

-Derek

[infantry317]

Yeah, its got a yammi part #

[infantry317]

From GPracer2500:

Yamaha part numbers for leak jets: 4JT-1494F-XX-00. Replace the XX in that number to get these various sizes (e.g. a 50 leak jet is 4JT-1494F-07-00):

#130 XX = 33
#120 XX = 31
#110 XX = 29
#100 XX = 27
#90 XX = 23
#80 XX = 19
#70 XX = 15
#65 XX = 13
#60 XX = 11
#55 XX = 09
#50 XX = 07
#40 XX = 03
#35 XX = 01

If you go to Yamaha of Troy or somewhere and plug in numbers you might find more in-between sizes. I didn't list some of them because a few have strange descriptions but I bet they are all leaks. Sometimes those descriptions are in error or inconsistant.

Honda part number for a #55 leak jet is 99108-MEB-0550, a #45 is 99108-KRN-0450, and a #40 is 99108-KRN-0400.

*** I just dropped one size from stock and it definately helped.

[oldskoolex400]

what size is stock?

stock on a honda is a 70...i went down to a 42 or 45...
got it from magic racing...along with some other stuff i needed to offset the cost($8) of shipping a small jet
leak jet (http://www.magicracing.com/Keihin-FCR-Accelerator-Pump-Jet-leak-Jet_p_0-1603.html)

[infantry317]

Stock size varies by year.

[popo]

Originally posted by oldskoolex400
what size is stock?

50

I went 35.

[daddio]

http://www.stealthracingtech.com/catalog.htm
I saw this in a dirt bike mag. 1/2 the price of a Boysen and it works just as good. They also have a stiffer spring for the fuel screw, to prevent it from backing out, and they have titanium fuel screws.

BTW.......... I am in no way affiliated with Stealth, I just thought they have really cool, inexpensive stuff.

As for the "leak jet" , I'm just to lazy to play with it. I wanted a bolt on and go product.

[the*ovenman]

Whats the advantage of having an aftermarket fuel mixture screw?

[infantry317]

They say you should actually set your fuel screw every time you ride :eek2: I think that's overkill, but the regular screw is for a screwdriver, good luck getting at it...the aftermarket ones are tough enough but allow you to use your fingers to adjust.

[the*ovenman]

Maybe this is a dumb question but what is it adjusting?

[cals400ex]

the fuel screw is a fuel adjustment mainly at idle. it does play a role up to 1/4 throttle or so as well.

[woodsrider4ever]

this whole leak jet thing could some one explain because when its could and hasent been run yet (after being idle for a wile) and i hit the gas it bogs some time just in the beging intill it gets really warmed up what should i do? anything would help

[06YFZ450SE]

I have the Boyesen Quick Shot and Both Power Now and Power Now Plus. No more Bog and the throttle Reponce is awsome now.

What size leak jet is stock on an '07 YFZ?

[bradley300]

Originally posted by woodsrider4ever
this whole leak jet thing could some one explain because when its could and hasent been run yet (after being idle for a wile) and i hit the gas it bogs some time just in the beging intill it gets really warmed up what should i do? anything would help

the leak jet and a/c pump work together to aide quick chops of the throttle. from what i have heard, you need to adjust both to get it right as adjusting one, will cause a reaction with the other and need to be tuned to work with each other