VMenu

Blog Archive

Powered by Blogger.
Monday, 7 December 2015

Cars & Transportation: Motorcycles: “Question: I feel as if I'mnot downshifting correctly. Try to do the rev matchng but fail. It won't shift down. Then I have to shift down well stopped.?” plus 5 more

01:24 | Posted by | Edit Post

Cars & Transportation: Motorcycles: “Question: I feel as if I'mnot downshifting correctly. Try to do the rev matchng but fail. It won't shift down. Then I have to shift down well stopped.?” plus 5 more

Question: I feel as if I'mnot downshifting correctly. Try to do the rev matchng but fail. It won't shift down. Then I have to shift down well stopped.?

Posted: 06 Dec 2015 09:33 PM PST

(for cars and trucks, where every shift passes through neutral)
To down shift smoothly, it sometimes requires
that you first shift to neutral,
let the clutch out and tap the gas,
to rev the engine a little
(and the parts of the gearbox connected to the clutch,
even while in neutral),
then, quickly push the clutch in
and down shift,
(while the RPMs are still up a bit)
touching the gas again,
as you let the clutch out,
because the engine will have to be turning faster
in the lower gear.

This process is called double clutching,
for the pretty obvious reason
that you engage the clutch twice
during the process.

This process revs up the gearbox,
so it is slowing through the speed
where the engine side of the gear box
matches the speed of the lower gear
as the gear meshes.

This isn't supposed to be necessary
with syncromesh gear boxes,
but it takes the load off the synchronizer.

For a motorcycle, with sequential shifts.
the best you can do to match speeds
is to let the clutch out,
just a little as you rev the engine
and try to down shift.
The problem is not so much to match the speed
for the new gear as it is
to take the tooth pressure
off for the gear you are trying to get out of.

You need a little clutch friction
to spin the engine side of the gear train,
but allow for slippage as the gears
try to match up
as the small clutch in the synchronizer
tries to establish a speed match.
It is easier for the synchronizer to slow a slightly to fast
engine side
than it is for it to speed it up.

Once the gear clunks in,
notice about how fast the engine ends up needing to be
(for that gear and road speed),
so you have a better idea
about how fast to rev it
the next time.

--
Regards,

John Popelish

Question: Im 15, Im from Portugal and I dont know wich motorcycle I should get Im undecided between honda cbr 125, honda nsr 125 and yamaha yzf 125?

Posted: 06 Dec 2015 05:08 PM PST

Thank for the info Chris :)

My worries are:

Honda nsr 125- fuel consumption, oil costs
Honda cbr 125- slow on highways and has 9.6kw out of 11kw that A1 license allows
yamaha yzf 125- its really expensive

Question: Does a motorcycle license count as a drivers license when financing a motorcycle in Florida?

Posted: 06 Dec 2015 03:23 PM PST

Report Abuse

Additional Details