75 KZ400 Engine Knock

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04 Apr 2009 07:00 #278290 by Pbisesi
75 KZ400 Engine Knock was created by Pbisesi
Hi guys
I've been lurking for a while this winter.
I picked a 75 KZ400 to build for my wife to learn to ride.
I did it in a Low Rider style. She couldn't sit flat footed on the stock bike.
Any way, I finally got it outside and started it up.
It seemed to run OK. Yesterday When I went to start it I got a loud squeeling sound. This morning I turned it over again and it started right up, but seems to have a knock.
I think it's in the top half.
I don't know much about these bikes.
Any ideas?

Thanks
Pat

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04 Apr 2009 08:00 #278305 by oldkaws4ever
Replied by oldkaws4ever on topic 75 KZ400 Engine Knock
Was it cold out? My 76 kz 400 squeels like like a pig when its cold out and it gets started. The knocking is probally again due to the fact there was no to little oil in the top end. I would say to let it warm up and take it for a ride and see if the knock goes away.
74 Z1a 900 (Apart and making it better than ever)
77 Kz 650b (Threw a rod, going to sandwich in a 900 or 1000 motor)
76 Kz 400d
05 ninja zx-636
81 Kz 750 Ltd
Darien, Illinois

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06 Apr 2009 10:41 #278867 by Pbisesi
Replied by Pbisesi on topic 75 KZ400 Engine Knock
Found a video of what my bike sounds like.

Any ideas?

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06 Apr 2009 10:58 #278874 by flht1997
Replied by flht1997 on topic 75 KZ400 Engine Knock
there is not a tensioner on the primary chain and they can make a bit of noise when they are on the sidestand, does the noise change when you right the bike? also balancing the carbs can help some.
Matt Milwaukee, WI
75' KZ400, (5) 78' KZ400, 76' KZ 750, 78' KZ650
78'CB750F, 78' CB550K
89' BMW R100RT
05' H-D Electra Glide
06' KLR650
Do it right or don't bother doing it at all.

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06 Apr 2009 11:01 #278875 by timebomb33
Replied by timebomb33 on topic 75 KZ400 Engine Knock
pull in the clutch and see if the noise goes away, or as has been suggested get the carbs sync'd.
1973 z1 2-1974z1-a,2-1975z1-b dragbikes1015cc+1393cc, 1977kz1000,1978kz1000,1981kz1000j, 1997 zx-11, 2000 z12r,1428turbo nitrous pro-mod and a shit load of parts thats all for now leader sask.,CANADA
I THINK MY POWERBAND BROKE

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06 Apr 2009 12:41 #278888 by bountyhunter
Replied by bountyhunter on topic 75 KZ400 Engine Knock
Pbisesi wrote:

Hi guys
I've been lurking for a while this winter.
I picked a 75 KZ400 to build for my wife to learn to ride.
I did it in a Low Rider style. She couldn't sit flat footed on the stock bike.
Any way, I finally got it outside and started it up.
It seemed to run OK. Yesterday When I went to start it I got a loud squeeling sound. This morning I turned it over again and it started right up, but seems to have a knock.
I think it's in the top half.
I don't know much about these bikes.
Any ideas?

Thanks
Pat

The twins seem to be notorious for bad starter clutches. I read they can make noise.
1979 KZ-750 Twin

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06 Apr 2009 13:04 #278897 by gane
Replied by gane on topic 75 KZ400 Engine Knock
Pat. little or no help, The periodic rumble I hear before blipping throttle sounds charistic of cam chain and/ or clutch basket. does it go away after up to temp? G
[img][/img] 1977 KZ1000A1

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