TZR 125 pit bike running lumpy

binge · Emo Kiddy Joined: 03 Jul 2004 Karma :

Took the bike out for a ride yesterday. I warm it up a bit before I go.
Before it's fully warmed up, It runs amazingly. Like Shit off a stick. Seriously seriously fast. Like power wheelies in 3rd fast!

As soon as it's fully warm, It bogs down in the lower revs.
It's still just as perky at max RPM, But anything below 3/4 throttle, and it's a bit boggey and hesitant to pick up.

Plug is burning fine, Maybe a little rich but nothing major.

It's running a Delorto PHBH28 carb which has 2 pilot jets. Could it be the jetting of these?

And where can I get Pilot Jets. I've struggled to find anywhere that sells them.

Cheers

Ben

ms51ves3 · Super Spammer Joined: 08 Jun 2007 Karma :

I'd try dropping the needle down (moving the circlip up) and see how it is then.

TUG · World Chat Champion Joined: 12 May 2007 Karma :

2 jets? wouldnt one be idle the other needle?
I assumed this so if i'm wrong i'll be glad for you to tell me i'm wrong an point me in the right direction. Thumbs Up

____________________
Haz ER-5, innit!

binge · Emo Kiddy Joined: 03 Jul 2004 Karma :

Na this carb has 3 jets.

1 big main jet. And 2 pilot jets. Nightmare.

I'll check the needle height next time im in the garage. Cheers! Smile

Ben

boundy · Nearly there... Joined: 24 Jan 2009 Karma :

Have you tried these for your jets?

https://www.dellorto.co.uk/