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occasional grind when downshifting to first (Read 23 times)

Bobbert Serious Thumper Offline CHOP IT Posts: 836 Los Angeles, CA Gender:	occasional grind when downshifting to first 09/26/07 at 16:53:42 Im pretty sure there's an easy answer to this, but I dont know it yet Sometimes when I am downshifting into first the pedal will vibrate and give out a grind noise, something Ive heard on cars before but never on bikes. What is it? and yes, clutch is in
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Brewbrother Serious Thumper Offline Just lending a helping hand. Posts: 953 Gender:	Re: occasional grind when downshifting to first Reply #1 - 09/26/07 at 17:16:04 JMHO, but I think you are going to fast to shift into first gear. Apply the brakes for a moment, then downshift.
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forrest Serious Thumper Offline No matter where you go, there you are. Posts: 986 Kennesaw, Ga Gender:	Re: occasional grind when downshifting to first Reply #2 - 09/26/07 at 17:18:19 Yep, if you are still going too fast your bike may protest a bit going into first.
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rokrover

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torkenstein

Posts: 147
SoCal

Re: occasional grind when downshifting to first
Reply #3 - 09/26/07 at 17:45:29

Usual...... first gear takes a while to spin down to stationary (because of the arge ratio difference) so the dogs can mesh quietly when clutch is pulled. I have two approaches -
1) pull clutch and wait several seconds (3 or more) before shifting down from neutral - OR -
2) get the bike rolling by pedaling with your feet (or downhill roll) so mesh speeds on mainshaft / layshaft match up before engaging first.

Bike transmissions don't have the benefit of synchromesh cones that match the locking dog speeds on input / output shafts to ease gearshifts in autos.

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Bobbert Serious Thumper Offline CHOP IT Posts: 836 Los Angeles, CA Gender:	Re: occasional grind when downshifting to first Reply #4 - 09/26/07 at 20:17:16 so even if Im coasting to a stop and I want to downshift it early and hold the clutch the whole way, I should wait until its in the right range?
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grandpa Senior Member Offline Old but not cold!!! Posts: 259 Bartlett TN Gender:	Re: occasional grind when downshifting to first Reply #5 - 09/26/07 at 20:49:46 YES!!
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justin_o_guy2

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What happened?

Posts: 55279
East Texas, 1/2 dallas/la.

Re: occasional grind when downshifting to first
Reply #6 - 09/26/07 at 21:00:16

If you are in a hurry to downshift it to 1st, let the clutch out in neutral & give it a throttle blip, that will spin the tranny guts up to match the belt spinning the output shaft. Pull the clutch & downshift. IF you are wanting to let the clutch out, hold the engine rpm up high enough to not drag the rear wheel. Then roll throttle off.

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Rockin_John

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+36° 10' , -95° 48'
Gender: male

Re: occasional grind when downshifting to first
Reply #7 - 09/28/07 at 00:37:01

Assuming you have a 5-speed; its second gear is only slightly higher than first on the older 4-speed. If you aren't a heavy weight, or starting uphill, you have the option of pulling away from a stop in second gear. It doesn't require much clutch slip, and probably little or no damage done to the clutch. Clutches are easier to replace than gears. Try it and see if it is has potential for you.

I can do it smoothly, without chattering the clutch, and a minimum of slippage, and I weigh in at 250+! Like I said, it's not much different from taking off in first on my 4-speed 87. In fact, if the pavement is smooth, after slipping the clutch for 5-6 feet on the 87, I can dump the clutch; grab a big handful of throttle, and spin/smoke the tire across an asphalt intersection! What fun!!!

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justin_o_guy2 Serious Thumper Offline What happened? Posts: 55279 East Texas, 1/2 dallas/la.	Re: occasional grind when downshifting to first Reply #8 - 09/28/07 at 10:42:00 If I want to, I can run the bike down from 5th to first & never use the clutch & not lurch the bike around, but the wrist & toe timing between second & first is a trick, BUT, there's NO way I can spin the rear tire. All I can get is a wheelie. What am I doing wrong John?
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