[atomiclizzard]

ok i have a 07 drz400sm full yosh 3x3 and jet kit for whatever reason when im on the highway 50-65mph maintaning a constant speed my drz feels like its starving for fuel and jerks me around, but when i give it gas it accelerates just fine. it only does it when im at higher speeds trying to maintain a constant speed. at first i thought it was a vacume leak or somthing so ran it with the petcock in on mode and it still does it. please help

 

[GROOVY2]

it could be some crud that is in the fuel delivery circuit --
petcock - fuel line - float valve -

You could try this and see if it helps before removing carb ect-
drain float bowl - remove fuel line from petcock -
blow compressed air threw float bowl drain hose -- (dont use real high pressure air)
see if any crud comes out of fuel line-
ride bike and see if any difference --

 

[atomiclizzard]

thanks that sounds easy enough, ill give it a try and repost the results

 

[mean-machines]

sounds like you are right at the point where your pilot jet is opening.. its not starving for fuel but getting over loaded with fuel.. only happens at that speed.. try pulling a large incline at that speed and see if it still does that.

my friend had this problem with dyno jet, jet kits

 

[Zorro2012]

What was the problem, ,, any update?

 

[stink]

Agreed! Dyno Jet kit is the shits. JD kit solved the same problem and then I solved the Mikuni carb prob and got a FCR. upgradeitis...Definitely a jetting issue.

 

[iceyrider]

I had a similar problem with my 230. It was shuddering on the bottom and bogging 1000 rpms before redline. Went 35 to a 40 pilot, and 140 to135 main. Fixed it right away.

 

[Zorro2012]

A bone stock drz400sm its doing it. ,,,,,I install a slip on, 3x3 mod. 25 pilot . 155 main jet. And still doing it,,,,,,,,WTF. Thanks in advance

 

[iceyrider]

A bone stock drz400sm its doing it. ,,,,,I install a slip on, 3x3 mod. 25 pilot . 155 main jet. And still doing it,,,,,,,,WTF. Thanks in advance

Does it stop if you go to half or full choke?

 

[ohgood]

A bone stock drz400sm its doing it. ,,,,,I install a slip on, 3x3 mod. 25 pilot . 155 main jet. And still doing it,,,,,,,,WTF. Thanks in advance

shim the needle. if you ride it lean like that for long, you'll kill the rings.

check your stator to ensure its not that, since you've changed jetting.

 

[Zorro2012]

shim the needle. if you ride it lean like that for long, you'll kill the rings.

check your stator to ensure its not that, since you've changed jetting.

Yes forgot to post I also shim the needle. 3 washers under

 

[Twbrooks]

I am having the same issue at higher speeds when cruising around 70 to 80 anyone have any results to what really helped or fixed the issue.
Thanks
Tyler

 

[Zorro2012]

[email protected]#$*% gas cap

Issue resolved, here
was the gas cap not breathing correctly

 

[Zorro2012]

Wtf it did it again

Its my buddy sumo he just told me it did it again
we try a differnt gas cap and was fine for one day
[email protected]#%/ing problem
Sounds like its running out of fuel at WOT on FWY or up hill

 

[Twbrooks]

Yeah i plan to call JD and talk to them about maybe redoing my jetting at a different setting for the elevation i live. I can go from 800ft to 6000ft within miles from each other.

 

[Zorro2012]

Yeah i plan to call JD and talk to them about maybe redoing my jetting at a different setting for the elevation i live. I can go from 800ft to 6000ft within miles from each other.

I don't think it's the jetting though
when was bone stock was king the same thing
now slip on 3x3 mod main jet 155, oversize pilot jet. Shim needle.
And. Still or the same. Fd%*# thing