low power and brake issue

Wendell Crain wendell_crain at hotmail.com
Mon Jun 2 13:26:14 PDT 2008

Sorry, forgot those tidbits this time. It has a M4 full system, stock carbs, stock airbox, K&N, stock motor. Pretty plain jane really. Biggest deal was that I bought all the pieces separately and put it together in about 3 weeks.

> From: afm199 at earthlink.net
> Subject: Re: low power and brake issue
> Date: Mon, 2 Jun 2008 12:27:42 -0700
> To: sv650 at micapeak.com
> pointless to speculate without knowing your exhaust, carbs, 
> airbox/filter and motor
> On Jun 2, 2008, at 11:40 AM, Wendell Crain wrote:
> > Well, I took the "3 week wonder" to the track and something definitely 
> > isn't right. During the second 20 minute session, I ran out of gas. I 
> > know I didn't have the tank all the way full, but this was excessive. 
> > I ended up using about 7 gallons for evening. There was so much fuel 
> > going through it, you could smell it in the exhaust. I never even 
> > thought to check that before. The bike had no top end power at all. 
> > Going with WOT, I was at least 10 seconds down on a lap time. I know I 
> > am slow, but definitely not that slow. We rode the primary bike for 
> > the endurance race on Saturday and going through the pits, I found 
> > someone that loaned me some smaller jets. (Based on another mechanics 
> > advice there, his suggestion was to go to around a DJ130 and remove 
> > both shims from the nylon spacer on the needles.) So I spent Saturday 
> > evening swapping over to the smaller mains and trying very hard not to 
> > lose any small parts inside my tiny trailer. In Sunday practices, the 
> > bike seemed like it had a bit more, but I was still down 8-9 seconds 
> > and this was going around most corners WOT. I wasn't using quite as 
> > much fuel though. While the bike was running you could still smell 
> > unburnt fuel, just not as strong. The mechanic made suggestions on 
> > things to try, since I have 2 weeks before the next round. Since I 
> > have DJ mains in it and stock needles, he recommended buying the DJ 
> > needles (or complete kit). I do have another set of carbs I had 
> > purchased, so he recommended setting those up to see if something is 
> > wrong with the first set. (As a quick easy test without tearing the 
> > first set down to find an issue.) Rebalancing the carbs. Do a 
> > compression check. (Anyone know what kind of number I would look for 
> > in central Ohio?) If the compression numbers don't look good, a leak 
> > test would be next. (I really don't have a clue on how to do that 
> > one.)
> >
> > Wendell
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