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CBR600FP 93 knocking when moving

My CBR600 F(P) '93 has a very loud knocking noise when I'm accelerating from low revs, in all gears. It sounds like someone is hitting the frame with a hammer, about twice a second. I've had the clutch and cam chain tensioner out and they appear to be fine. Any help would be much appreciated....

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  • Honda Expert
  • 120 Answers

Big end bearings ..i would hazard a gues at

Posted on Aug 14, 2013

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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  • 2336 Answers

SOURCE: Chain

Locate the tensioner locknut on the right-hand cilinder (bottom): -keep the engine idling for about two or three minutes -loosen the locknut about two turnes while idling -the chain tensioner will slide into the proper position -tighten the locknut to secure the tensioner position and stop the engine -repeat every 3000km or 2000mls

Posted on Nov 10, 2008

fredcause
  • 51 Answers

SOURCE: Loud Intermittent Droaning Noise

rear axle to ring gear side bearing is loose due to weak preload. might be able to locktight is its not to late. was in bmwmoa memeber mag this month december08

Posted on Dec 08, 2008

rselvy
  • 83 Answers

SOURCE: Grabby clutch in 1st.

I'll bet you replaced the "fiber" plates only in which case you need to either take the steel plated out and have them sand blasted, or preferably "glass beaded", you have a hot spot on one of the plates which is causing the clutch to be "grabby" also not sure if you replaced the clutch springs but if you did and they are after market they may be to high of spring pressure.
Did you install a stock clutch or a after market one? Many times the after market hi-performance clutches are made with aluminum plates and then they add the fiber and the clutch will chatter because the engine HP to to substantial for the aluminum to handle. I highly recommend using the stock Yamaha clutch plates and springs. They are of the highest quality and are the best to use.
Please let me know what type of plates you are running and I'll work from there with you. Also if you cannot get the plates blasted you can take them out and rough them up on your garage floor. Your want to use even pressure and move in a circular motion to scratch them up. Make sure you clean them afterward in mineral spirits. You can buy that at any paint store real cheap.
Good Luck,
RSelvy

Posted on Dec 12, 2008

  • 1 Answer

SOURCE: knocking noise when clutch engaged

also taking off outer cover and checking that the bots holding the clutch are all tight wouldnt hurt

Posted on Feb 11, 2009

  • 420 Answers

SOURCE: noise in trans or in primary chain

It sounds like the primary drive chain is loose. The way I adjust mine is to take off the upper left inspection cover, start the bike and slowly tighten the adjuster until it starts to wine, then back off until it stops. Rev it slowly and listen for a wine. No wine good to go.

Posted on May 07, 2009

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The smoke would be expected as would the temporary situation of poor performance. The grey oil is water emulsified in the oil. This probably had nothing to do with being knocked over. Normally the seals on the water pump impeller shaft go bad and leak water into the gearbox. I am going to take a guess and say the bike fell on its' left side. If so, chances are the shift lever was forced upward and the gear dogs did not line up with the next gear. This results in a bent shift fork (or two) and is $1000.00 or more to fix. I am guessing the metal to metal knocking is the dogs on a slider gear not fully meshing with the adjacent gear.

Could you take a moment and rate my answer? Thanks!

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