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Post Info TOPIC: Knocking on idle


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Knocking on idle
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Not sure where to post.... But, my bike has acquired a knocking sound when idling, had the bike go in 2 weeks ago for rejeting and to sort the mix. Since then it has started knocking on idle, any ideas or things to do to help discover what it is?

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DTR Senior Member

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When you say the did your jets was that all ?

Wouldnt have thought it would have made a knocking noise!!! Firstly i would take the plug out and make sure its safe to ride


Just incase you do not know


White =lean not safe to ride

Wet black=running rich

What to see a dry brown plug

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       merry crimbo


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im gonna check tomorrow i lety ya know

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DTR Respected Member

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I'd check your flywheel is torqued on correcty. I had exactly the same issue and after a stripdown found the following...

 

1) Flywheel nut came loose (shagged crank off ebay) and sheered the woodruff

2) I skimmed the head so it would seal properly with the head gasket - this raised compression thru the roof and started detonating

3) LHS crank bearing was shot due to the flywheel being loose (brand new, destroyed after only 200 miles of gentle riding)

4) Clutch housing was worn beyond repair and the cush drivers were disintegrating (done by previous owner)

So here I am almost £400 lighter but with a spanking new engine (crank, bearings, seals, clutch, barrel & piston) Morral of this story? DON'T BUY SH*T OFF EBAY!!! Especially when the parts are listed as "Came off a working bike..." Why would someone take the crank out of a running bike unless it was screwed? Lesson learnt :P

More to the point, you shouldn't need to touch the jetting in the carb. I'm running all standard setup apart from a DEP pipe and the jetting is spot on.

Does your bike leak a little bit of coolant from the expansion after a ride?



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tbh i haven't had a chance to look at anything else as was in a training day at work yesterday zzz. gonna get the tools out and look at the bike tomorrow so will check these, i am was allready running a 230 jet before the exhaust was fitted, but it my intention was to make sure the mix was correct. i do have a small bit of black fluid coming from exhaust port where it meets the expanny (but thats due to me getting a copper ring gasket that just doest work to well....)

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plugs fine..... still knocking but ive notaced it stops when the bike is warm

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DTR Senior Member

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Tbh im not going to sit here and say its a GOOD THING.

A pal of myn had a dtr , had the standerd size piston,with a barrel bored out 1mm oversized.

It wasnt a road bike neither any thing that we would on here call a nice dt ..... But it started 1st 2nd kick and ran half tidy for a 1988 dtr.



-- Edited by louisBOSS on Monday 22nd of October 2012 07:30:49 PM

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       merry crimbo


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Could be piston slap ?

When its warm the piston expands to the bore and stops knocking . Just a thought

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i hope not

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not the clutch is it mine knocked on idle when i did my clutch plates wrong. does the knocking go away when you pull the clutch lever or not?

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240 is standard main jet. Not 230 btw.

You can only check the spark plug after you've done a plug chop. I.e. You ramp the shít out of the bike. Get it to max RPM. At this point kill the engine pull the clutch in get into neutral and get it home. Then you check the plug.

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