Can this make my 250R knock??

**kloby** · 02-11-2006, 12:22 AM

40:1 is LEANER than 32:1

**RideRed250R** · 02-11-2006, 12:32 AM

no 250Rcrazy is talkin AFR.... think about it... the AIR to fuel ratio... with 32:1 the A to Fuel ratio is leaner but theres more oil in the mixture... LESS FUEL??? Leaner... when you add more gas and less oil 40:1 you have a richer mixture... the richer the mixture it starts to ignite better but less oil causes early ring failures and stuff like that... hes got that end down

as for the noise... i have a splitting head ache and iam trying to explaint his... The 250R has a unique port lay out.... all cylinders of the 250R have this... where the crank case is pressured then forced up through to the piston detinating... causing it to make the deep CLICK noice.... from the force of the air... if your familiar with Cheetah cub banshee cylinders thats what iam tlaking about...the port layout makes the click... also blazerone22 and the rest are right the counterbalancer will WHINE... which in turn sounds like a slap cause its really clanky... its cause the bearings and teeth will evently wear and make a noises... but most the time its just cause the gears are straight cut from factory, it causes less horses to be lost through the balancer..
MAN I NEED A ADVIL
Adam

**kloby** · 02-11-2006, 12:33 AM

whoops must of missed the AFR - lol - my bad

**RideRed250R** · 02-11-2006, 02:38 AM

np its just a cool thing if you think about it
you can richin and lean your AFR with your oil mixture
adam

**trikezilla** · 02-11-2006, 01:59 PM

Wow...I learned a lot from this post! I never thought you could make the thing rich and lean by simply changing the AFR!!
Thats interesting how the port layout is and how that can make a deep click.

Anyhow, thanks for all the information its greatly appreciated, and I can rest easy cuz Im not so worried about seizieng it or blowing her up lol

**rally4x4racer** · 04-22-2007, 10:57 PM

nice post -

Can this "deep click" be felt? I just noticed my 84 R is clicking in nuetral - this is such a deep click I can almost feel it in my foot - it seems like it is in the bottom end - (and I just noticed it. )
heres the kicker - I just changed the oil and put motul synthese 2 stroke gearbox oil 10w40 in it. I never noticed this before - is it because the oil I am running?
It does not do this after I pull the clutch in and kick it down to 1st gear.

anyone?
thanks - r4r

**gravelord** · 04-23-2007, 09:07 PM

the tick sound, never louder, never quieter, you can only hear it at lower rpms is the piston slap, its not bad, my 85 250r engine had it, and my newer one with a 89 bottom end in my atc has it as well, alittle louder because the heads milled. my friend on here, "deathman" who i go riding with also said its the same thing, but its quiet you have to listen for the sound, if yours is loud enough where you can hear it almost as loud as your exhaust - id say you have a issue. if you can barely hear it warming it up, then you put your head closer to the engine (lean forward well sitting on the bike) then you can hear it, (thats about how loud mine is), then its piston slap that they all have. i spoke to someone, they said the aftermarket cooled heads clear up the problem alittle, BUT yours is a air cooled one, id be more worried about other issues. i dont know if they have the same problems as the liquid. wish you lots of luck.

**JackFlack** · 04-23-2007, 10:07 PM

I can hear and feel mine at idle. Mine has allways been there since I bought it.

Sounds like someone hitting the top end with a rubber malet.

**4cylinders** · 04-23-2007, 10:28 PM

hey, not really sure if you are hearing piston slap. all the reed valve engines I've heard make that sound, kind of a click/buzz. might be the reeds, or piston/rings passing over the ports. some people can't hear it, loud exhaust or hearing problems.

**rally4x4racer** · 04-28-2007, 10:03 PM

this may be my famous last words, but.... "how about I just ride the hell out of it and see what happens?"

**rustyhondas** · 04-28-2007, 10:23 PM

that is what a 250r sounds like at idle.

**hrc85250r** · 04-28-2007, 10:29 PM

here's the deal. your motor has time on it. once one of these motors are ridden, beat and pounded for many many years, the gears all get some slop in them, from tooth to tooth, as well as he bearings. if you rebuild the bottom end, you will mellow the noise, but it will still be there. i have rebuilt the motor in my rider twice now, with all new bearing, rebuilt cranks, new crank bearings and top end, and the knock has always been there at idle. it could be the crank/crank bearingsm but im guessing its just time on the motor.

**rally4x4racer** · 05-13-2007, 12:15 AM

since this post I have been to the shop a couple of times.

The first time I fired up the bike with a friend - we took turns ripping accross the yard. NO NOISE ........
Today I kicked the bike over and got it running.... NO NOISE. I ripped around the yard for a bit and then pulled to a stop. NOISE!! Now that I got the noise back I paid close attention to it as I do not think it is normal if it is intermittent - do you?
it has an organic (destructive) kind of 'crack' to it. When I hear it I just keep thinking fiber disks - because it is not as solid as a metal knock - or metal on metal.
I noticed that when I shifted into 1st with the clutch in - the bike lurched forward. I tightend the clutch cable and it helped that some.

this can not be normal!! ideas?

**stefan34** · 05-13-2007, 03:55 AM

I have the same problem only I noticid when I did a smaller main jet in the carb (because it smoked too much and didn't pull right). and now it runs great only that sound I didn't like to much but if you guys say its normal I believe you.

**rally4x4racer** · 05-13-2007, 09:20 AM

I will let you know when it blows up

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