Kfx450r front end rattle - Kawasaki KFX450 Forum :: KFX450HQ.com
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post #1 of 17 (permalink) Old 02-10-2019, 07:12 PM Thread Starter
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Kfx450r front end rattle

I have a 2008 kfx450r and itís carbureted and everything and I have a rattle in the front end at least it sounds like the front and I canít figure it out please help also I have a rattle in the motor when Iím on a hill or something and punch it I get a strange knocking noise any one know what it could be
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post #2 of 17 (permalink) Old 02-11-2019, 04:31 PM
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Welcome to the Forum....!!

It's usually a sign that your main bearings on the crankshaft are going bad...see if you can pinpoint the location of the knocking sound...ASAP...!!!!

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post #3 of 17 (permalink) Old 02-15-2019, 11:08 PM Thread Starter
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Thanks dust but how do I figure out that they are going bad and now when I take off on a hill it almost feels like it’s jerking and the whole motor shakes I’m so lost and I’m tired of putting money into this damn thing
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post #4 of 17 (permalink) Old 02-16-2019, 01:56 PM
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Thanks dust but how do I figure out that they are going bad and now when I take off on a hill it almost feels like itís jerking and the whole motor shakes Iím so lost and Iím tired of putting money into this damn thing
Does it jerk & shake in every gear when you get on it...???..or only a certain gear...If only a certain gear than you might have a broken gear tooth...

Have you drained the oil into a strainer to check for metal shavings...???

But if the knocking sound is heard in the lower motor area then you'll have to pull the motor apart to check it...or at least remove the cylinder and inspect the crankshaft...

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post #5 of 17 (permalink) Old 02-16-2019, 07:41 PM Thread Starter
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No the only time I have noticed it is when the quad is really cold it jerks and cold the crankshaft be just the bearings for the case because I really don’t want to buy a whole new crank and I was thinking could the sound be the valves because I can’t exactly pein point where it’s coming from because I’m all ways on a hill or something whim it does it and the bike was just carb converted cold that have anything to do with it??
post #6 of 17 (permalink) Old 02-17-2019, 01:18 AM
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No the only time I have noticed it is when the quad is really cold it jerks and cold the crankshaft be just the bearings for the case because I really don’t want to buy a whole new crank and I was thinking could the sound be the valves because I can’t exactly pein point where it’s coming from because I’m all ways on a hill or something whim it does it and the bike was just carb converted cold that have anything to do with it??
Try adjusting your carb for running lean air/fuel mixture to prevent the jerking when climbing hills...or have the carb re jetted for a proper air/fuel mixture if your running an upgraded intake such as a Fuel custom Intake system....see picture (FCI vs Stock)

If it's only when the motor's cold & under extreme load on the motor....then it's probably the valves ticking...Not sure without hearing it myself to make a proper diagnosis...???

If the main bearing were knocking you would loose a lot of the performance whether the motors Hot or Cold...It's sounds like a hammer pounding inside the crankcase...!!!
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Last edited by Dust Devil; 02-17-2019 at 01:24 AM.
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post #7 of 17 (permalink) Old 02-17-2019, 02:52 PM Thread Starter
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Thanks dust I’m going to get it shimmed and have my carb jetted thanks for the help
post #8 of 17 (permalink) Old 07-07-2019, 12:39 PM Thread Starter
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Hey dusty it’s me I’ve done a lot to it and it’s been running good but now I have a new piston and valves and it does start right it’s hard to start sometimes have to pull start it I’ve tried everything I can think of do I need to shim the valves again since it hase some hours on them
post #9 of 17 (permalink) Old 07-07-2019, 12:55 PM
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Check tps. It might be a little out of spec

Definitely check valve lash.

Also, turn the idle speed up a little. It might be a little low.

What ecu are you running?

08 KFX450r- DASA, FCI, Stage 2 Hotcams, Wiseco Programmer, Procom, Dynatek Coil, 6K HID, 7" LED Light Bar.

Race Tech dual rate front springs, GT thunder XC Link and Race tech spring, LSR +2 a arms, Tusk Extended Rear Hubs

Poly Case Saver, Streamline Stabilizer, Full PRM Skidplates, Pro Armor Bumpers, Tusk Heel Guards, IMS 3.7 tank

Next up: Dasa head port, JE 12.8 piston and 21x12x8 6 paddle skat trak extremes.
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post #10 of 17 (permalink) Old 07-07-2019, 04:53 PM Thread Starter
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I’m running the procom Ecuador could I change the spark by changing the settings
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