my gsxr lndy is very jumpy when i drive slowly in low revs but when i put my foot down it picks up fine. Is this a bec problem . Any advice appreciated
No not a bec problem
No mine was like an Eagle .......... and a bat out of hell.. all in one
MACS BAT OUT OF HELL
[Edited on 5-3-11 by mangogrooveworkshop]
Duno never driven a kangaroo
[Edited on 5/3/11 by Thinking about it]
Check the backlash in the diff. That might be the cause of kangarooing.
You can do this by putting it in gear, jacking one side up and seeing how much play you have by gently rotating the wheel forwards and backwards.
It shouldn't drive badly at low speed.
Perhaps some fine adjustments are needed?
I found mine was much better to drive when the clutch pedal / leverage had been altered to give a more progressive feel, rather than an on off switch.
Made it much easier to drive in traffic.
Perhaps having a look at the throttle pedal / cable may be useful. I tried to make mine a bit more positive by fitting a return spring to the carbs.
Made the throttle pedal a bit heavier and less responsive to involuntary movement of the foot (i.e. when going over a speed bump / cattle grid / hump
back bridge, or when driving on part throttle.
I also put a bit of slack into the throttle cable, so the carbs don't open as soon as my foot rests on the pedal. I think I have 1/2" of
travel first.
I'm sure some of the more capable engineers on here could explain about pivots, arcs of movement, levers etc etc, but I just went by trial and
error!
When you say "low revs"
I wouldnt let the 'blade drop below about 3000.rpm
I think you may be labouring it
quote:
Originally posted by MakeEverything
Check the backlash in the diff. That might be the cause of kangarooing.
You can do this by putting it in gear, jacking one side up and seeing how much play you have by gently rotating the wheel forwards and backwards.
ust my 2p's worth, Don't forget you are drving a vehicle with a clutch that's normaly used with 2 fingers and a throttle that's
used with the other hand which are a lot more sensitive than the 2 lead weights you're trying to use now, with that in mind practice feeling for
were the bite point of the clutch is, it's a fine balance of throttle and clutch. I'm not sure if the diff ratio would come into the
equation only ever driven a 3.62.
tony
Do you need some sort of cam on the throttle cable to smooth out the inputs at part throttle?
mango....where did you do that? been looking for a wee bit of airfield to see what happens when im silly...
quote:
Originally posted by daviep
quote:
Originally posted by MakeEverything
Check the backlash in the diff. That might be the cause of kangarooing.
You can do this by putting it in gear, jacking one side up and seeing how much play you have by gently rotating the wheel forwards and backwards.
I really can't imagine that a slack diff could cause kangarooing.
Checking backlash as described isn't ideal as as you are also checking backlash or wear in the planet gears, propshaft joints, propshaft slider and the gearbox all at the same time. A much better check for backlash in the CWP would be to apply the ahndbrake (assuming it's not a transmission brake) put the gear box in neutral and turn the propshaft by hand, you'll be able to feel the backlash in the diff quite clearly.
Davie
Thats crail one of the few days in the year when they can make noise!!! 
thanks for the advice, i need to look at the diff first ,it dose sound noisey ,more so when changing gear. Cheers
Throttle response is so quick the bike engines that a steady foot on the pedal is essential. Are you strapped in nice and tightly and can you reach
the pedals easily? Do you have skateboard grip tape under your heels?
If you can move around at all in the seat or your heel slides on the floor it is very easy to set up a violent kangaroo action.
Davie
I made up a lever that increased pedal movement by 100% to give around 4" pedal travel.
Description
"I'm sure some of the more capable engineers on here could explain about pivots, arcs of movement, levers etc etc, but I just went by trial
and error!"
quote:
Originally posted by 40inches
I made up a lever that increased pedal movement by 100% to give around 4" pedal travel.
Description
I get the same problem with my Xflow engined car if I'm a bit clumsy driving at lowspeed , think it's a combination of lightweight flywheel , responsive engine and the need for a proggresive throttle. It's not a problem if I take a bit of care
Fit stronger springs to the throttle pedal and try that.