Help Needed

[Jo Rhett]

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
> well.
> 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
> there.
> 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
> 
> 
> ----------
> Doug Pippin
> 828-684-8488
> <mailto:>d_pippin_89<mailto:>@bellsouth.net
> 
> ----------
> 

-- 
Jo Rhett /  velociRaptor Racing
#553 WERA / AFM