daz9
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| posted on 24/5/09 at 07:30 PM |
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noisy gear change
i have a r1 powered mac 1 kit, when changing up or down in any gear there is a lound horrible clonk from the rear of the car, has anyone had this
fault or can anyone advise on the fault or solution? 
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matt.c
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| posted on 24/5/09 at 07:35 PM |
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Quite normal with a BEC. You can cut the sound a bit with a TRT prop.
[Edited on 24/5/09 by matt.c]
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locoR1
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| posted on 24/5/09 at 07:37 PM |
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What he said ^^^^^ Quite normal
 
Description
Check out my CB500T Cafe Racer build diary
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daz9
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| posted on 24/5/09 at 07:40 PM |
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quote:
Originally posted by matt.c
Quite normal with a BEC. You can cut the sound a bit with a TRT prop.
[Edited on 24/5/09 by matt.c]
so should i not worry about the clonk and live with it? it sounds terrible ! where would i get the forementioned prop?
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mark chandler
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| posted on 24/5/09 at 07:49 PM |
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Do not worry, as you master driving it you can reduce the clunk greatly.
clutchless changes going up, and lifting the revs slightly using the clutch on the way down.
Regards Mark
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locoR1
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| posted on 24/5/09 at 07:50 PM |
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You will always get the clonk with a bec but a TRT prop improves it.
Dont get it from autoprop they are rubbish  got my second prop from http://www.baileymorris.co.uk/
and the quality and service is excellent unlike autoprop!
Edit to say: Mark is spot on with the above statement the more you drive it and improve you technique the better it gets!
[Edited on 24/5/09 by locoR1]
Description
Check out my CB500T Cafe Racer build diary
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gordon h
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| posted on 24/5/09 at 07:53 PM |
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normal mine very loud clonk due to slack in diff.
bec is best but going to try sabb 2.3 turbo mk
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adithorp
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| posted on 24/5/09 at 08:04 PM |
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Agree it's normal...but check your prop bolts are tight anyway.
adrian
"A witty saying proves nothing" Voltaire
http://jpsc.org.uk/forum/
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daz9
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| posted on 24/5/09 at 08:22 PM |
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thanks for all your help 
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wilkingj
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| posted on 24/5/09 at 09:27 PM |
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Another Vote for Bailey Morris.
A quality firm.
1. The point of a journey is not to arrive.
2. Never take life seriously. Nobody gets out alive anyway.
Best Regards
Geoff
http://www.v8viento.co.uk
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MakeEverything
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| posted on 25/5/09 at 09:03 AM |
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If it were mine, id look at a cush drive flange at the diff, and taking out the backlash in the diff with shims etc. Thats after id adjusted the
clutch to make sure it doesnt drag.
I dont know a great deal about BEC's but when you select first on a bike you often get a clonk if the chain is slightly slack or the clutch
drags a little.
Kindest Regards,
Richard.
...You can make it foolProof, but youll never make it Idiot Proof!...
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Dan
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| posted on 25/5/09 at 09:17 AM |
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I knew a guy who had a clunk!
Turned out to be his diff was loose in the cradle. He didnt build it some one elses oversight.
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:{THC}:YosamiteSam
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| posted on 25/5/09 at 09:12 PM |
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just out of interest what is a TRT prop? is that a rubber jointed one instead of uj's?
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Guinness
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| posted on 26/5/09 at 07:42 AM |
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quote:
Originally posted by :{THC}:YosamiteSam
just out of interest what is a TRT prop? is that a rubber jointed one instead of uj's?
I think a TRT prop is a "torque resilient tube". It has an inner tube connected to the engine, and an outer tube connected to the diff.
Sandwiched between these two tubes is rubber, which flexes and allows the two tubes to move slightly in relation to each other.
I think!
Mike
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