NC23 rattle at 4/5/6k revs

DK-Tandy · Post by **DK-Tandy** » Fri May 27, 2011 10:38 pm

ive took my bike apart today to check my jets, once i had put the bike back together its gained an horrible rattle from 4k revs to 6k revs.. it sounds like theres metal grinding in the engine and sounds rather clunky.. once i hit over 6k revs its fine also up to 4k revs is fine also..

last thing i want is it to go kaboom on me while im riding down the road..

anyone with any clues what it is??

amorti · Post by **amorti** » Fri May 27, 2011 10:50 pm

DK-Tandy wrote:ive took my bike apart today to check my jets, once i had put the bike back together its gained an horrible rattle from 4k revs to 6k revs.. it sounds like theres metal grinding in the engine and sounds rather clunky.. once i hit over 6k revs its fine also up to 4k revs is fine also..

last thing i want is it to go kaboom on me while im riding down the road..

anyone with any clues what it is??

What odds are there that something fell in to the inlet ports? That'd be pretty bad news.

Post by **Drunkn Munky** » Sat May 28, 2011 12:11 am

DK-Tandy · Post by **DK-Tandy** » Sat May 28, 2011 10:51 am

wouldnt that cause a rattle through all revs though??

DK-Tandy · Post by **DK-Tandy** » Sat May 28, 2011 10:56 am

before i stripped the bike, i used to get it at 6k revs but since taking the carbs off and re-fitting its started at 4k to 6k now...

could it be vibrations? ive noticed if i press down on my tank, its quieter... so i know my tank has a slight rattle..

micklewright · Post by **micklewright** » Sat May 28, 2011 11:02 am

Could be anything if its just a feint rattle, You may have something rattling against the bottom of the tank, your inlet clips might be letting in some air causing a rattling type sound, you might have a relay rattling around, fuel pump vibrations.... If its not strictly mechanical then there are lots of annoying rattles that can occur, often raspy type sounds which tail off after revs.

As for the fact that its only at certain revs, think about resonance and frequencys of sound. Only certain things will react at a certain 'pitch' or depth of a noise/vibration. For example, my bolt on screen on my XJ550 only vibrates at mid revs, not early on or higher in the revs, the clutch lever bounces up and down at tickover but stops whilst cruising etc etc

Hopefully this is why you are only getting these annoying rattles at these revs.

Post by **Wozza** » Sat May 28, 2011 1:15 pm

Can you get a video up Dan?

Post by **lizard821000** » Sat May 28, 2011 3:08 pm

sounds like you forgot to tighten somin up lad.

DK-Tandy · Post by **DK-Tandy** » Sat May 28, 2011 4:04 pm

ive noticed that when i hit the rough rev range, if i push on tank near above fuel cap it goes..

at the RAF meet, curt said he liked the vibration at around those revs so i think its causing the tank to chatter on my frame.. my plan is to fit a peice of rubber between the tank and the frame where it bolts near the handlebars..
hopefully giving it some height above my frame and cushioning with the vibration :)

Post by **Wozza** » Sat May 28, 2011 4:22 pm

It should have rubbers on each side anyway - get some proper Honda ones from Graeme.

NC23 rattle at 4/5/6k revs

NC23 rattle at 4/5/6k revs

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Re: NC23 rattle at 4/5/6k revs