Engine noise at low rpm

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GeorgeMoroz
Posts: 10
Joined: Wed Apr 12, 2017 2:21 pm
My Bike: ZXR 400 L3

Engine noise at low rpm

Post by GeorgeMoroz »

So my engine gave out and i got an ex race engine, the guy hadnt touched it internally just oil and filter changes, i drop it in start it up and i've got this ticking noise that it prominent at about 2-3k rpm. Can also be heard when the revs are running down through that rev range.

I have got a video but it wont let me upload it will see if i can get one on

Cheers
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banner001
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Posts: 2584
Joined: Sat Sep 24, 2011 3:27 pm
My Bike: ZXR400 L4
Location: Nuneaton

Re: Engine noise at low rpm

Post by banner001 »

put video on youtube, post the link here.

as for ticking, its gonna be timing chain, knackered rocker arm, bad cam, valve clearances not correct, general clutch rattle or some other mechanical gremlin.

take off the rocker cover and pulsar cover, check the timing and valve clearances along with the timing chain tension, race bikes usually run larger clearances to make up for heat expansion.
UK ZXR400 L3 (1993) - Fully restored and on the roads, my green beast!
JPN ZXR250 A2 (1990) - Revs to 19,200rpm... 'nuff said :smt003
GeorgeMoroz
Posts: 10
Joined: Wed Apr 12, 2017 2:21 pm
My Bike: ZXR 400 L3

Re: Engine noise at low rpm

Post by GeorgeMoroz »

fixed....was a weak chain tensioner, wouldnt rachet properly and would bob up and down even when turned over by hand. had a spare and is fine now but replaced the chain to be safe.

cheers for the help
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banner001
Track day God
Track day God
Posts: 2584
Joined: Sat Sep 24, 2011 3:27 pm
My Bike: ZXR400 L4
Location: Nuneaton

Re: Engine noise at low rpm

Post by banner001 »

no worries :D glad you got it all fixed, the automatic tensioners do fail from time to time, though on the whole they are pretty reliable.
UK ZXR400 L3 (1993) - Fully restored and on the roads, my green beast!
JPN ZXR250 A2 (1990) - Revs to 19,200rpm... 'nuff said :smt003
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