Idle drop after revving.

Jdeks · 01-10-2013, 08:30 PM

Hi again all,

I'm putting my bike back together, after having done a lot of service work (valves, new oil regulator, cam chain tensioners) and also I've switched to a 2 to 1 exhaust, and installed Pyndons prefilter. I'm using a jetting config that he recommended for it (nothing special really, actually pretty close to stock).

It starts fine, idles fine, revvs fine. No smoke from the exhaust. But when I rev it hard and then let it off, the idle drops low (about 1000rpm) for a few seconds then slowly recovers. Sometimes, if its a really fast on/off throttle snap, it dies on the way back to idle. It pops a little on its way back down the revs, but thats normal I believe.

Any ideas?

Thanks!

Jdeks · 01-11-2013, 05:42 PM

Anyone?

I've checked carb sync, calibrated the TPS, checked the carbs are seated properly.

:(

Jdeks · 01-12-2013, 04:27 AM

Okay, I think I fixed it. Swapped out my new fuel filter for my larger old one - seems it was restricting fuel flow.

Got a new problem now though...

GSAragazzi · 01-12-2013, 04:35 AM

But I'm also waiting for someones suggestions bc my bike starts, runs well but after 5 min it starts to sputter and then dies. Push and push the magic button and nothing. If i wait 5 min it starts but sputters, give gas and dies. The only thing I've found helpful is to let the bike fall on its side (clearing whatever the problem is) and then it starts and back to square 1.
I'll ck my fuel filter, so thanks.

Anyone out there with any suggestion?

Jdeks · 01-12-2013, 04:45 AM

My fuel filter was a custom one I installed myself.

I would check your fuel pump - have you opened it up and looked at the contact points?

Deepc · 01-12-2013, 05:13 AM

It sounds like your fuel pump might be on its way out. There are a bunch of upgrade options out there. I used the dr. beans kit. Its cheap, simple to install, and was delivered in about 1 week.

01-10-2013, 08:30 PM	#1
Jdeks ^OP Gnarly Adventurer Joined: Aug 2009 Oddometer: 297	Idle drop after revving. Hi again all, I'm putting my bike back together, after having done a lot of service work (valves, new oil regulator, cam chain tensioners) and also I've switched to a 2 to 1 exhaust, and installed Pyndons prefilter. I'm using a jetting config that he recommended for it (nothing special really, actually pretty close to stock). It starts fine, idles fine, revvs fine. No smoke from the exhaust. But when I rev it hard and then let it off, the idle drops low (about 1000rpm) for a few seconds then slowly recovers. Sometimes, if its a really fast on/off throttle snap, it dies on the way back to idle. It pops a little on its way back down the revs, but thats normal I believe. Any ideas? Thanks!

01-12-2013, 04:35 AM	#4
GSAragazzi Gnarly Adventurer Joined: Sep 2012 Location: The Purgatory of Suburbia Oddometer: 441	Not a Hijack But I'm also waiting for someones suggestions bc my bike starts, runs well but after 5 min it starts to sputter and then dies. Push and push the magic button and nothing. If i wait 5 min it starts but sputters, give gas and dies. The only thing I've found helpful is to let the bike fall on its side (clearing whatever the problem is) and then it starts and back to square 1. I'll ck my fuel filter, so thanks. Anyone out there with any suggestion? __________________ "The Only Easy Day Was Yesterday"

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01-11-2013, 05:42 PM	#2
Jdeks ^OP Gnarly Adventurer Joined: Aug 2009 Oddometer: 297	Anyone? I've checked carb sync, calibrated the TPS, checked the carbs are seated properly. :(

01-12-2013, 04:27 AM	#3
Jdeks ^OP Gnarly Adventurer Joined: Aug 2009 Oddometer: 297	Okay, I think I fixed it. Swapped out my new fuel filter for my larger old one - seems it was restricting fuel flow. Got a new problem now though...

01-12-2013, 04:45 AM	#5
Jdeks ^OP Gnarly Adventurer Joined: Aug 2009 Oddometer: 297	My fuel filter was a custom one I installed myself. I would check your fuel pump - have you opened it up and looked at the contact points?

01-12-2013, 05:13 AM	#6
Deepc Gnarly Adventurer Joined: Apr 2011 Location: Sarasota, Florida Oddometer: 267	It sounds like your fuel pump might be on its way out. There are a bunch of upgrade options out there. I used the dr. beans kit. Its cheap, simple to install, and was delivered in about 1 week.