get ready for the colder plugs yer gonna need! too bad it's not a 2 stroke
bike i have the book on exhaust system design and theory for them. see
this is why americans should own hardley davidrocks(stone age versions of
later more popular yuppie glides) instead of highly sophisticated asian two
wheel riding devices. asians spend some serious time and money on r&d for
exhaust system design to optimise power and economy . any tampering and
one or both are sacrificed. all modifications have a effect on the vehicle.
relieving back pressure will result in running leaner, and if you are prone
to run it long at high rpm could eventually experience some unsettling
results of experimentation.
since the system has been modified already try some colder heat range plugs.
chuck
back from lime rock in one piece, in spite of an exciting 2 wheel off on no
name straight thursday.
----- Original Message -----
From Bill Miller <millerb at netusa1.net>
To: Spridgets <spridgets@autox.team.net>
Sent: Sunday, July 09, 2000 3:16 AM
Subject: Non LBC Motorcycle question.
> Since it's slow, I have a question about my motorcycle. 1983 KZ750.
Bought
> it new and hardly ever ride it. Drove it to work Friday and one of my
> younger co-workers said he'd like to do something to it to make it perform
a
> lot better. He said it would be louder, but sound better and perform
*much*
> better. He drill four strategically placed holes in each of the back of
the
> exhaust pipes. I know the size was important, because he searched for the
> right sized drill bit for a half hour. WOW, talk about a difference.
Like
> a new bike. I bet it has twice the acceleration than it did before. Ok
why
> that much difference? I understand relieving back pressure helps, but not
> that much. Also, it "cackles" now. Small little "backfires" upon
> deceleration and quick revs. Kinda sounds nice, but I don't understand
how
> adding holes to the back of the exhaust system can cause backfires.
>
> It got me thinking about drilling holes in the Sprite mufflers......
>
> Bill
>
>
|