jorhett at fastlizardracing.com
Mon Jul 25 13:34:34 PDT 2011
I agree -- I would clean the carbs thoroughly without regard for what your eyes can see. I had this problem and it turned out to be a bit of dirt lodged in one of the main jets that only mattered when the needle was partially closed. I couldn't see it with my eyes, but when I soaked the jet it floated free and I saw it then.
On Jul 25, 2011, at 8:07 AM, KC Gager wrote:
> Sounds like 1 or both slow jets may have some crude in them.
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> -----Original Message-----
> From: sv650-bounces at micapeak.com [mailto:sv650-bounces at micapeak.com] On
> Behalf Of Doug Pippin
> Sent: Monday, July 25, 2011 7:58 AM
> To: sv650 at micapeak.com
> 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
Jo Rhett / velociRaptor Racing
#553 WERA / AFM
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