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Post subject: power drop
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stoney What's an RD? Joined: 03 Jun 2008 Total posts: 4 |
i have a 1981 rd350 lc with ypvs fitted , up untill a dew days ago this bike was running very well and would pull cleanly in all gears upto 11000 revs and if you gave it a handfull in 1st or 2nd you would be off the back , but now there is a drop off in power the bike still starts hot or cold no problems but the engine response is off and nowhere as sharp as it used to be going to change plugs to see if this resolves the problem but any suggetions would be welcomed !! 
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Posted: Tue Jun 03, 2008 10:28 pm
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Bare All-gear Wheelie! Joined: 28 Jan 2006 Total posts: 1818 Location: Vancouver Canada |
Hopefully your tach is overreading Cuz if you actually were using 11,000 rpms your crank would now be disassembling itself... and your bike would be performing poorly... as the first symptom of such.
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Posted: Wed Jun 04, 2008 2:43 am
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jante350 RD/RZ Jedi Master Joined: 05 Aug 2003 Total posts: 5130 Location: Bergen, Norway |
Yup, it dont like anything above 10K, or the crank can twist, wich will result in odd problems like this, cause the timings will be off. It could lead to seizure on one side, and also different plug readings...
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Posted: Wed Jun 04, 2008 7:55 am
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| stoney What's an RD? Joined: 03 Jun 2008 Total posts: 4 |
problem fixed had carbs apart and found needle valve seal had gone , so fitted new o ring , just took out for test ride and shes pulling very well , also checked techo reading using cable techo as one thats fitted to bike is eletrick , and found that eletrick techo is reading high ! with cable driven techo from engine shes topping out at 10100 rpm 
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Posted: Wed Jun 04, 2008 10:35 am
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| jmw |
Carbs needed a service then?
Wasn't the crank twisting then and timings going out then and the engine welding itself up inside then? 
Good news but oh man, some of the abject detritus / cack handed replies you get here are unreal.
The tachos get worse the faster you spin the motor which is a little disconcerting considering where the pulse is taken from.
You can happily spin the LC to past 11K in real terms but obviously and naturally, faster rpm could contribute to an accellerated failure or deterioration of engine condition / performance.
If it's got some miles on it already then think before making it work harder.
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Posted: Wed Jun 04, 2008 12:24 pm
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