HEADS UP!!!

Site upgrade in progress... Core site functions are working, but some non-critical features/functions will be temporarily unavailable while we work to restore them over the next couple of weeks.

Please post any bugs you encounter, but before you do, check to see if it's already listed.

Thanks for your patience while we work to improve the community.

Sign in to follow this  
Followers 0
Mike_from_WA

Flywheel Weight causing low end BOG

8 posts in this topic

I have a 99WR with all the free mods. I'm running a very open pipe (Pro Circuit).

Have WR timing, and jetting just about spot on.

EKN #3

MJ 165

MAJ160

PJ40

PAJS 1/2 turn = 65

PS 2 turns

APJ .020

Before adding a 12oz flywheel weight I had snap wheelies in just about any gear at any speed.

Had good snap from closed throttle with no bog.

Now after adding a 12oz flywheel weight I have that closed throttle to snap open BOG. Sometimes it boggs then BAAAAROOM picks right up, and sometimes it bogs almost to a backfiring sound then dies.

As long as the throttle is open a little and then I snap it open it runs fine.

What should I try first clip position or APJ.

[ September 17, 2002, 10:14 AM: Message edited by: Mike from WA ]

Share this post


Link to post
Share on other sites

The only thing you should have to do is adjust the APJ. The weight slows the balancer rotation just enough that the splash of fuel from the APJ is enough to cause the hesitation. I had the same exact problem with my WR....You can use an RC Wheel Colar to adjust the APJ Rod (Did this on my WR), or the P-38 Lightning which I used on my YZ.

Bonzai :)

[ September 17, 2002, 10:21 AM: Message edited by: YAMAKAZE ]

Share this post


Link to post
Share on other sites

it's that old problem that i haven't really heard anyone else aknowledge;

you're only slightly rich. THE HESDITATION ONLY HAPPENS WHEN YOU ARE SLIGHTLY RICH.

so take your PC right down and it'll then disappear.

Taffy

Share this post


Link to post
Share on other sites

So do you think I should go to a 38PJ and 55 or 65 PAJ? Or could I lean out the PC with larger PAJ say a PAJ75

Would delaying the squirt on the APJ fix the problem instead of changing PJ? I'm already down to about the smallest squirt I can get. I have a 99 so to delay the squirt I would have to bend the tab out.

Share this post


Link to post
Share on other sites

make the squirt start early and finish even earlier! that's what i reckon.

don't change the ratio just to lean out the PC. go 38/60 and that should do it. you're just a little unlucky that's all.

also don't forget to adjust your PS to the best position to snap the throttle with.

Taffy

Share this post


Link to post
Share on other sites

I adjusted my APJ to start immediately when the throttle is moved and a very short duration.

Then using the FS went from 1/2 to 2 1/2 turns out and got most of my snap from closed throttle back. The BOG is almost gone at 2 1/2 turns.

I guess my next test is to try just changing the PAS which is set at 65 to maybe 60 or 75.

Then I'll try the 38PJ and 60PAS.

Share this post


Link to post
Share on other sites

Well I went to Taffy's recomendation.

Thanks Taffy.

38PJ, 60PAS and my snap is back very little BOG from closed throttle when snaping it open.

I think I just need some more riding to adjust the fuel screw and maybe slight adjustment to the APJ.

Good wheelies from just a little throttle and whack it open in first and second gear.

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!


Register a new account

Sign in

Already have an account? Sign in here.


Sign In Now
Sign in to follow this  
Followers 0