Help Needed

KC Gager kc at
Mon Jul 25 08:07:40 PDT 2011

Sounds like 1 or both slow jets may have some crude in them. 

The Home of A Sickness for Quickness
K.C.  Owner of BRG Racing Products and Dyno Services
kc at
Shop # 925-680-2560 
Toll Free # 1-877-ride-brg 
110 2nd Ave South Unit D 12
Pacheco Ca 94553
AFM's 650 Twins Championship '08\'09 with Wil Fox
AFM's Formula IV Class second place '09 with Wil Fox
AFM's Formula Pacific #1 plate, '07\'08 with Dave Stanton
AFM's 650 Twins Championship '07 with Jeff Hagan
AFM's Formula IV Class Championship '07 with Jeff Hagan
AFM's 650 Twins Second Place '06 with Dave Civiello 
AFM's 600 Superbike Championship '05 with Chris Siglin
AFM's Open Production Championship '04 with Chris Siglin
AFM's 650 Twins Championship '02 with Woody Woodward
AFM's 500 Twins second place '99 with Simon Forder
AFM's 500 Twins Championship '98 with Simon Forde

-----Original Message-----
From: sv650-bounces at [mailto:sv650-bounces at] On
Behalf Of Doug Pippin
Sent: Monday, July 25, 2011 7:58 AM
To: sv650 at
Subject: Help Needed

Any suggestions to my problem here?

I have a 99 SV650 track bike that recently started acting up.
When I'm on the track and have full or almost full throttle the bike runs
Once the RPM's drop it doesn't run clean. Sputters and pops somewhat.
The problem started while I was riding on the track.
The engine starts normally and runs at higher RPM but sputters and 
pops when in lower RPM.
It backfires when you release the throttle and sometimes when it's shut off.

I've removed the carbs and checked them visually and everything seems OK
I've replaced both the coils to eliminate any problem there.
I removed the valve covers and checked the valve timing and it is 
correct according to the timing mark on the generator.
This bike has the 2nd gen camshaft swap and it ran well for a season 
and half until recent problem started.
I've checked the compression and it's good.

So I'm scratching my head as to what's wrong.
Is there a problem with SV's where the key on the generator may shear 
making the valve timing off?
Does this sound like it may be a ECM  (igniter) problem?

I'm going to remove the carbs and go through them again to see if I 
missed anything.

Any suggestions?

thanks in advance

Doug Pippin


More information about the SV650 mailing list