Boyesen Accelerator Pump Cover?


82 replies to this topic
  • SSpeeDEMONSS

Posted March 20, 2005 - 07:41 PM

#41

a little help here please.

  • DPW

Posted March 21, 2005 - 11:06 AM

#42

beats me,maybe the 00 doesn't have it? mine was visable right away :)



You are correct, no go on the '00

Pic of leak jet http://www.pbase.com.../image/39133659

  • smokin529

Posted March 21, 2005 - 05:14 PM

#43

what does that have to do with this topic?


Isn't this thread about the Boyesen cover or did I read the title wrong?

  • Unibomber

Posted March 21, 2005 - 06:50 PM

#44

I got the Boyesen Cover and installed it on my 04' 450. There is no more super rip from the bottom. I like the mega thump but its no good for racing in the tight stuff. With the Cover you can snap the throttle and its an instant smooth power transfer. :)

  • YamahaRacer

Posted March 21, 2005 - 07:19 PM

#45

What does the new cover say?

  • SSpeeDEMONSS

Posted March 21, 2005 - 09:41 PM

#46

ok, so now that i have a leak jet for my carb and i cant use it, is it possible for me to but a float bowl from a '01 carb and put it on my bike? will it work the same?

  • yzfmxer

Posted March 21, 2005 - 09:55 PM

#47

You shouldnt need a the leak jet mod at all, especially if you have allready done the BK mod. If you choose to buy the Factory R and D or boyesen acel, cover, make sre and check your pump duration time to see if it changed it at all.

  • yzfmxer

Posted March 21, 2005 - 09:58 PM

#48

Ohh and buy the way,
No YZF 400, 426 has EVER had a leak jet, thats a brand new thing that yamaha put on there 05's maby there 04 450 has it but im not sure.
there 250F's on the other hand HAVE had them for awhile.

  • SSpeeDEMONSS

Posted March 21, 2005 - 10:41 PM

#49

ok, ill mess with the fuel screw and the timing for the shot.

so now that i have a leak jet that i cant use, does anybody want it? ill send it to them for free. just let me know. #50.

  • ncmountainman

Posted March 22, 2005 - 08:04 AM

#50

Ohh and buy the way,
No YZF 400, 426 has EVER had a leak jet, thats a brand new thing that yamaha put on there 05's maby there 04 450 has it but im not sure.
there 250F's on the other hand HAVE had them for awhile.

the 03-05 definately have the leak jet,oh by the way :)

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  • yzfmxer

Posted March 22, 2005 - 09:32 AM

#51

Im sorry, I didnt know they made a 03-05 YZF 426?? I said I wasnt really sure about the 450's. The guy has a 00 426, and no 400 or 426 has EVER had a leak jet. :)

  • ncmountainman

Posted March 22, 2005 - 10:17 AM

#52

it's pretty obvious that when someone says 03-05 they're talkin'bout 450's you've gone to the other side(traitor),maybe took a severe blow to the head and need a little extra 'splainin. go adjust your valves :)

  • YZ426FROCKS

Posted March 22, 2005 - 01:54 PM

#53

Go with the Factory R&D cover, the make one made for the 426, boyesen's are all the same. Talk to Jeff at Factory R&D, and he will tell you the difference. Plus it's billet anodized red! Worked wonders on my 02 YZ426F. It's about the same price as Boyesen's. Better part!

  • yzfmxer

Posted March 22, 2005 - 05:06 PM

#54

Listen, You were telling Speeddemons, that he needed to change his leak jet, His bike doesnt have a leak jet and eather did any 98-02 , 400-426. We were never talking about any 450's he has a 00 426 not a 450.

So why in the hell do you keep bring up 450's???

  • ncmountainman

Posted March 22, 2005 - 07:22 PM

#55

Listen, You were telling Speeddemons, that he needed to change his leak jet, His bike doesnt have a leak jet and eather did any 98-02 , 400-426. We were never talking about any 450's he has a 00 426 not a 450.

So why in the hell do you keep bring up 450's???

if your talkin' to me i never told anyone to change their leak jet,i'm referring to how the new ap cover would work with a 40 lj . obviously if the 426 has none;hence "maybe the 00 has none" if the conversation we were having here didn't apply to speeddemon i was trying to help him where to look for it as i was not sure if it had one or not. anything i'm saying is directly related to the 03-05 as that is what i have. NOT a crf go spew crap on the honda forum :)

  • RobRantzow

Posted March 22, 2005 - 08:09 PM

#56

How does it work with modified carbs such as BK mod ect.?

  • MotoWRat

Posted March 23, 2005 - 09:38 AM

#57

Repeated rapid throttle opening can deplete the fuel in the AP reservoir quickly causing the engine to stumble. I believe the Boyesen addresses this problem by increasing reservoir capacity, which would provide better response in situations requiring several quick throttle twists, such as hill climbing.

i have the #40 lj and i occasionally experience exactly what you describe (at least it feels that way to me) when i'm in technical sections on and off the throttle every now and again it will just quit. not often but enough.

These posts sum up my interest with regard to this product exactly. I could not get a straight answer on the 250F forum and no "actual" experience in the replies. If you know about the "not invented here" attitude toward new products and new ideas, you'll understand. All I could determine is that if you putt down the trails, the #40 LJ is all you need for an '04.

Nevertheless, I was able to gather from talking to local racers that the QuickShot does indeed keep the motor from bogging in real-world, dynamic throttle demand situations. That's with a #50, #60 or even stock leakjet.

YMMV (disclaimer)

  • Plusdome

Posted March 23, 2005 - 05:21 PM

#58

Whats the difference between the Boyesen cover and the P-38 ??? The color??

  • stavendirtbike

Posted March 23, 2005 - 05:48 PM

#59

Reading my most recent Transworld MX they had a very postive review on the product.

  • yzfmxer

Posted March 23, 2005 - 06:49 PM

#60

They each say that there the best. But I have had verry good luck with Factory R & D, and they have made it for alot longer than Boyesen.





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