zxrlocost
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| posted on 28/4/06 at 08:44 AM |
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gear change probs
Hi Ive been having a few gear changing probs when I was driving my car
it drives perfect apart from when thrashing it from 1st to second it finds neutral
it goes from first to second when going slower perfect
it also goes through all the other gears perfect
so to me that means my paddle is working perfect and Ive got the gear selector positioned ok
my clutch pulls ok
and it doesnt jump out of gear
I could swear I also get whine more in second
Ive noticed that when I was looking at some other peoples BECs there gear selector you could flick it and it would go into gear
mine you have to really clunk!!
and thats at the engine end
Ive got good oil in
so If I start with the gear selector what would I be looking for if it was worn
its an r1 engine
thanks chris
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rayward
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| posted on 28/4/06 at 08:57 AM |
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on an bike engine surely neutral is between 1st and second.
6
5
4
3
2
N
1.
Ray
[Edited on 28/4/06 by rayward]
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zxrlocost
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| posted on 28/4/06 at 09:06 AM |
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should explain better mate sorry I know that
neutral is the slightest touch
but when driving it shouldnt find neutral easy
I really have to bang it twice when thrashing to go into second something isnt right
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skydivepaul
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| posted on 28/4/06 at 09:28 AM |
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sorry to say that it sounds like 2nd gears is fooooked. mine did exactly the same and ive got the engine in bits now. Its a common problem with R1
engines apparently as they eat second gear.
Mine was very noisy in second and it really clunked when engaging. i could live with that but the main problem was when giving it full power in second
gear it would jump out into neutral at about 10,000rpm. o.k. in every other gear though. i should have the box stripped out later today so i will
report back with the damage.
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smart51
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| posted on 28/4/06 at 09:30 AM |
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I used to have troble going from 1st to 2nd at high revs. I had two problems:
1) the hole in the transmission tunnel cover was too small and my gear lever bottomed out on the fibreglass. You need more lever travel when going
through neutral
2) there was too much play in my gear select cable. The gearbox end outer sleve mounting was turning a bit when pushing the cable, shortening the
amount of "throw" that it had. I put an extra bolt in to to stop it moving and it's been fine since.
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zxrlocost
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| posted on 28/4/06 at 09:50 AM |
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ok but mine doesnt jump out of gear
and goes in fine at low revs
so Im a bit stumped but ill check the lever first
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Nick Skidmore
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| posted on 28/4/06 at 10:57 AM |
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It'll be the dogs on the two gears that mate in the selection of second and or the selector fork that does the selecting.
I've had the same problem on a Hayabusa in a single seater, all gears selected fine at slow gentle speeds but once the hammer was dropped it was
at least two attempts for each gear.
When taken apart there was a fooked selector fork and three fooked gears.
The cause of it all was a poor quality gear change cable that was 'skiving' in the 'pull' direction.
Use only Tuthill Controls 'Cable Craft' Marine / Aerospace cables they are fit and forget.
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zxrlocost
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| posted on 28/4/06 at 11:07 AM |
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how would I know if the selector a was duffed mate
is it obvious
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Hellfire
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| posted on 28/4/06 at 11:43 AM |
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You'll be able to check the tolerances on the selector forks with those in the manual. You'll probably even notice the wear on your
selector fork if that's the problem.
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zxrlocost
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| posted on 28/4/06 at 11:49 AM |
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ok ill get a manual today which I was going to anyway
tolerances??
sorry but Im still learning
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Hellfire
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| posted on 28/4/06 at 12:08 PM |
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Within tolerance = 4.2mm - 4.8mm (made up figures)
Anything less than 4.2mm and they need replacing.
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zxrlocost
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| posted on 28/4/06 at 12:10 PM |
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ok cheers
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tks
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| posted on 28/4/06 at 03:44 PM |
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Tolerances
numbers like 5 +0 - 0.5
means that everything bigger as 5 will be fail and everything smaller as 4.5 will also be an fail.
The total tolerace will then be 0.5
Then you also have the 10 +0.2 - 0.5
same game everything between 9.5 and 10.2 will be fin bigger or smaller will be fail.
Tolerance margen = 0.7
regards,
Tks
p.s
There is also a standardisation for tolerances h7 and H7 is a example.
they are used sow everything straight away knows what to do.
The above comments are always meant to be from the above persons perspective.
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Nick Skidmore
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| posted on 28/4/06 at 04:10 PM |
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Basically with gears and selector forks if it dont look like brand new it's fooked.
The dogs will have rounded corners and burrs on them, the selector forks will be twisted and / or galled on the faces that contact the gears.
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zxrlocost
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| posted on 28/4/06 at 08:16 PM |
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ok ill get looking cheers
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