low power and brake issue

KC Gager kc at brgracing.com
Mon Jun 2 20:34:34 PDT 2008


Had you run this motor before you had done at this work?

KC Gager
BRG Racing Products
"We Have Sickness For Quickness"
KC at brgracing.com
http://www.brgracing.com
(925)672-5789
 


>> 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.
>>
>>
>>
>>>> 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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