85-86 250r knocking sound

[Blown 331]

its definitly isnt the engine knocking at idle, engines only knock like that when under load on the wrong octane but if it is that the engine is knocking you can change the ignition timing to compensate but i cant remember if you retard it or advance it

will

Retarding the timing will reduce spark knock but you will also lose power.

[hrc85250r]

yeah, i tried that, i have best results +2 degrees..... but i talked to psi today, and they said that most likely its piston slap, i think im gonna pull my top end and check the piston-cyl wall clearance, the wiseco box said that the clearance was 3 thousandths (.003), so hopefully thats what it is and i will make sure the place i had it done at buys me a new piston and does the next bore job for free....bastards

[tp250ratc]

my 86 r has a clunk, clunk, clunk sound while at idle or low rev. it definately makes you think something is wierdo. this same bike also runs out great and hauls arse while riding it. i'd say your knock sound is normal in your bike. for comparison sake, i have a suzi quadracer 250r that has a much different sound at idle than the honda r. it is more like a small engine rev- like a chainsaw, weed eater, etc. no knock, just whiney- so to speak.

[hrc85250r]

thats exactly what mine is doing... it sounds like there is a serious problem with a main bearing or something...i will be splitting the cases tomorrow night to find out whats up...hopefully nothing, but its best to make sure cause god knows engine parts are big$$$$ compared to a gasket set and a couple hours.....thanks man

[bigyellow4x4]

i have been told it the ports in the head are round and big gives pist slap and new ones have a running in the middle so it not there? so how do * balance the motor if you habe to light of pistion in it with counterbalance. i have car knowlage on balancing so do hipo bike shop spin balance these motors?

[Fox250R]

thats exactly what mine is doing... it sounds like there is a serious problem with a main bearing or something...i will be splitting the cases tomorrow night to find out whats up...hopefully nothing, but its best to make sure cause god knows engine parts are big$$$$ compared to a gasket set and a couple hours.....thanks man

Dude your looking to much into this..5 or more people have said their Rs do the same thing at low rpm...So why go though all the trouble lol..Like they always say if its not broke dont fix it.. Maybe your ping is alot worse than what im thinking...You need to film it ..

[hrc85250r]

i am going through all the trouble cause i dont have a lot of money to fix it if it throws something through the cases or something grenades inside the tranny.....and i wont know if its broke unless i split the cases, and it isnt a ping, its a knock.....and i would tape it but i dont know anyone with a digital camcorder....

[Ryan DeBerry]

All 2 strokes do it at idle. I have a nice NICE 86 250r and you can hear it. It's normal. If you don't like the knocking then get a 4 stroke!

[Fox250R]

All 2 strokes do it at idle. I have a nice NICE 86 250r and you can hear it. It's normal. If you don't like the knocking then get a 4 stroke!

My buddy has a 03 CRF450 and it knocks too LMFAO!

[YTZ250#1]

every 250r has a knock to it.I was told by the best honda tech that I know that it is a slight piston slap,and it won't ever go away.you can replace every part in the motor and it will still be there.you won't have a problem with it,just run it.