low power and brake issue

Ernest Montague afm199 at earthlink.net
Mon Jun 2 15:10:30 PDT 2008


I'd run 144- 146 mains or so, shim 40 thou.  If it is burning that much 
gas it is some thing else, not the mains.



On Jun 2, 2008, at 1:26 PM, Wendell Crain wrote:

> 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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>>
>
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