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General Discussion / Re: V85TT Throttle Body Boring
« Last post by Stretch on Today at 10:02:54 AM »Sometimes ONE change will result in a performance increase.
Many times that ONE change has to be allied with other changes.
For instance, I changed the exhaust cam timing on my KLR after reading an article about it and
reviewing the accompanying dyno charts. The resulting 10% (or so!) power increase
also required airbox mods. I had already modified the airbox, exhaust and
carburetor, so my engine was able to exploit the revised exhaust cam timing.
It pulls a higher top speed in top gear up hills and mountains now. There is
noticeably more mid-range power, which was what I wanted and what was
advertised. Not sure I would have realized that significant gain without ALL
of the mods.
Manufacturers have to balance engine longevity, driveability, noise regs, emissions
regs, maintenance hassles, and other factors when finalizing a design.That's
probably why Kawasaki sent it out the door the way they did.
The above mods result in a louder bike - one that isn't obnoxious, but certainly
wouldn't pass the government's tests. The cam change alone made things noticeably
noisier under heavy throttle. The carb mods probably won't allow the bike to pass emissions
standards, but markedly improve throttle response, and make the bike a whole lot
easier to ride. Fuel mileage appears unchanged after about 5,000 miles of testing.
Boring your throttle body with no other changes MIGHT improve your bike's powerband
and/or driveability. Might not. Your bike might need a bunch of other changes to take advantage
of the larger throttle body. Only one way to find out.....
YMMV.
-Stretch
Many times that ONE change has to be allied with other changes.
For instance, I changed the exhaust cam timing on my KLR after reading an article about it and
reviewing the accompanying dyno charts. The resulting 10% (or so!) power increase
also required airbox mods. I had already modified the airbox, exhaust and
carburetor, so my engine was able to exploit the revised exhaust cam timing.
It pulls a higher top speed in top gear up hills and mountains now. There is
noticeably more mid-range power, which was what I wanted and what was
advertised. Not sure I would have realized that significant gain without ALL
of the mods.
Manufacturers have to balance engine longevity, driveability, noise regs, emissions
regs, maintenance hassles, and other factors when finalizing a design.That's
probably why Kawasaki sent it out the door the way they did.
The above mods result in a louder bike - one that isn't obnoxious, but certainly
wouldn't pass the government's tests. The cam change alone made things noticeably
noisier under heavy throttle. The carb mods probably won't allow the bike to pass emissions
standards, but markedly improve throttle response, and make the bike a whole lot
easier to ride. Fuel mileage appears unchanged after about 5,000 miles of testing.
Boring your throttle body with no other changes MIGHT improve your bike's powerband
and/or driveability. Might not. Your bike might need a bunch of other changes to take advantage
of the larger throttle body. Only one way to find out.....
YMMV.
-Stretch
