My either Crazy or that knocking /pinging is BAD...

S

Scar13

New member
So I got my EC 250 carb cleaned up and on the bike and set up to idle nice and low.. NOW I hear a pinging /knocking sorta like piston head SLAP.. as I rev the Bike up and run her its smooth strong and you can no longer hear the noise.. ( engine is to loud )

However the faster you rev her and before the engine noise gets to loud you and hear that pinging/knocking get faster too. Obviously its either supposed to sound that way ( I some what doubt ) or I have a issue ready for explosion..

NOW I did crank the ec 300 and could BARELY hear it on that bike..

I put fresh OIL so its not oil unless I added to much...( 900 CC but I let it drain while angled on the kick stand residual could have added maybe 100 CC ? ) Silkolene Medium 85-90

Fuel perhaps?? I run only 93 octane and run 50 - 1 Should I look at adding a OCTANE booster??


Maybe its normal and I am crazy..
 
does it do the same when pulling the clutch,at idle?
if so , then it's your clutch basket that's a bit loose.
it could allso be the nut on the RHS of the cranckshaft, therefor you need to open the RHS engine cover.
 
Most common rattle complaint is play in the power valve mechanism allowing excessive movement at low RPM. Easily adjusted out.
 
Scar13 said:
However the faster you rev her and before the engine noise gets to loud you and hear that pinging/knocking get faster too.
Click to expand...

this doesn't sound like pv - pv clatters and is not faster/slower at different revs. it's just the slackness of the pv rattling around. especially hear it from idle to 1/2 throttle under load - it sounds like a slapping/rattling noise, untill the governor pulls it open and noise goes away.

pinging generally SOUNDS like it is coming from the pipe and not the motor.

does it sound like it's coming from the front of the pipe? like marbles bouncing around in the pipe? that's the best sound description i can think of for pinging....

knocking is usually something loose... or possibly piston slap.
sounds to me like a rh crank nut, clutch hub, nut, or a bearing about to give up.

too much oil will have no noise effect - even if you drastically overfilled it, it would just test the seals, and eventually blow something out (but not make a knocking sound) - most regularly put 950ml in anyways (1 quart..)


does it sound bad ("oh my god something is gonna let go") or just annoying ("what is that noise?")
 
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Really depends on how fast "faster you rev her" is. Could be the pipe o-rings too. Did this just start after the carb work? If so what other hardware was R&R?
 
I honestly can not say I remember it OR do not remember it.. The Bike revved way to high before the carb rebuild to notice it..

I did ride it before the carb rebuild for about 5 hours so I DOUBT anything is going bad, but it sounds to me like it coming from the head/ gear area..

I think I will just slap her on the Jeep and drive her to a shop and let them listen and see what they think..

IF I can Ill see if I can capture it later on Video/sound..

I did Put new reeds on it and replaced the Exhaust Flange O -rings..

Its more of a low knock...
 
My raga trials and my 07 Ec300 both had similar amount of noise as that and both are fine.They are a noisy motor from what I have seen.Some of that noise will quiten when the clutch is pulled (on mine anyway).
Cheers Mark
 
that sound is not pinging. it's either piston slap, or bad small end bearing/pin. sometimes bad big end bearing/pin makes a noise like that too. so it's either slop in the rod at either end, or slap. my it175 makes a noise like that at idle (and my it200 does not make that noise..)- i thought it was slap, rebored, new top end and it's still making the noise. crank bearings seem ok, and big end seemed fine. so if you figure it out, let me know....
 
stainlesscycle said:
that sound is not pinging. it's either piston slap, or bad small end bearing/pin. sometimes bad big end bearing/pin makes a noise like that too. so it's either slop in the rod at either end, or slap. my it175 makes a noise like that at idle (and my it200 does not make that noise..)- i thought it was slap, rebored, new top end and it's still making the noise. crank bearings seem ok, and big end seemed fine. so if you figure it out, let me know....
Click to expand...

My EC300 had a bit of a rattle at idle and a real fluttery brrrr as the revs fell down. Started around 70hrs which was what prompted a fresh top end. Hadn't done it before, and didn't do it after. Strange thing was the ring gap was still in spec and piston didn't show too much wear. The replacement Wossner A piston had less clearance though. Here's a vid of it when it was playing up. If I can get around to it today I'll post one up of it now.

http://www.youtube.com/watch?v=X0iKTObBOuQ
 
Tech at the shop says it's detonation ... So I have some gas gettig ready in the garage with oct booster now ... So roughly 2 hours we will know for sure.. He says his makes the sane sound .. And this bike has a total of 20 hours on it.. I'll post back when I feel the fuel is all properly mixed ..
 
Scar13 said:
Tech at the shop says it's detonation ... So I have some gas gettig ready in the garage with oct booster now ... So roughly 2 hours we will know for sure.. He says his makes the sane sound .. And this bike has a total of 20 hours on it.. I'll post back when I feel the fuel is all properly mixed ..
Click to expand...


what does the plug look like? in the video posted, that bike is not pinging...

if yours is in fact pinging, i would check the timing - they have no problems running on regular low octane gas when timing is set factory...
 
stainlesscycle said:
what does the plug look like? in the video posted, that bike is not pinging...

if yours is in fact pinging, i would check the timing - they have no problems running on regular low octane gas when timing is set factory...
Click to expand...

Affirmative!

The stock engine is far from a highly strung race engine requiring high octane fuels. Built with huge tolerances to accept shite fuels all over the place.

I could understand pinging under load with lean jetting, but to ping on the stand? Either way interested to hear back on your results.

They are quite a noisey engine though.
 
Did you wind the idle up to showcase the sound, or were you holding the throttle open a little?

I recorded some video of my bike idling today and showing some throttle. It definately makes some engine noise as well. It always has to a certain extent. Jetted crisp and runs strong.

http://youtu.be/kjFprYTZJZE
 
First and foremost thank you all ..

The first 2 seconds in my video you can hear it best.

Jakobi, No sir I never touched the throttle. I n saying that I will make a movie just like yours tomorrow morning and post it.. Same movement and out side of my garage..

In all of my years rebuilding cars and lawnmowers I have never heard such a loud motor.. I would tear it down, but I am new to 2 stroke MX/Dirtbikes..
 
Choke on/off? Just started or warmed up and up to temp? What happens to the engine sound when you pull the choke? I'd be looking at using the idle speed screw to bring the idle down personally. Sounds like its racing. I get the same result when lifting the slide too far too. Racing and sounds like its going to blow up.

I've put considerable time and kms on my 300 and it hasn't blown. First top end at 70hrs and would have to check to see where i'm upto again on the second. (Checked: 150hrs total/80hrs on current piston. Distance 4400kms) You definately shouldn't need one at 20hrs.

Off topic: Average speed 30km/hr. Too many days spent jetting and riding around the yard!
 
gasmonkey said:
^^^Haha,and then posting on here and dbw!!
Click to expand...

..hahaha! and then work and the gf, riding the bike, washing the bike, mowing the lawn, enjoying cool beverages and you've just about summed me all up! Theres a bit of overlap between most things too.. If only the cool bevs could go with work I'd be livin the dream!
 
hi scar.
mine has a similar rattle/knocking noise.... mines not as loud as yours.
Does it change at all when you pull the clutch?
 
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