86 250r Engine noise...what's making it? You tube video to hear!

[oscarmayer]

ok before anyone goes further, are we sure the oiling is correct for that motor in the mixture. I've been a crew cheif in karting world for a few years, and that noise sounds like lower bearings going, or even rod end bushing gone. also sounds like piston is scouring the cyclinder walls.

nowgranted the mtoors i tuned were rotax 125s, but wouldn't a 2stroke sound like a 2stroke at idle?

one other thing it could be while thinking of it is reeds are not correctly installed, or worn prematurely.

I do know if I heard that in a motor i was workign on, it's be torn down and sent off to the shop for rebuild (not allowed to rebuild and seal them per racing rules, but i was allowed to dissamble all i wanted for troubleshooting but not assmeble).

I'd look at the oil/gas mixture your running, next check the plug and tuning. tune the carb and get the mixture right. set the plug gap accordingly or even the plug heat range. after that i'd start checking for internal wear.

good luck.

[oscarmayer]

ok listened again for 4 times. in a row. sounds like bottom end noise. in the trans or clutch area is what it sounds like to me.

only other thing is the reeds are not right is what i can think of.

[Tri-Z Pilot]

seeing as many other peoples r's sound like this, it could just be the way they are once they wear into themselves

[Taiser]

Oil is thick at around 20:1 since it's (my) first tank and it was sitting for a long time, plug is new, gapped properly. Noise is coming from on top somewhere, near the reed area, put a stethascope (sp?) on the bottom end, all is smooth, most of the noise again seems to be coming from the reed area, maybe a bit in front and is mostly noted on the left side, probably because the exhaust is on the other side and hiding it? Would the reeds make noise if they started going?

[Tri-Z Pilot]

if your worried about the reeds, throw a nice aftermarket set on, couldnt hurt.

[Erics350x]

Well has to have something from the kick starter to some kind of gear...it don't start by osmosis!

Engine was sitting for the last 20+ years but was properly stored, had been fogged and had proper long term storage oil in the gear case.

checked the inside when I got it with a borescope, all was well, no rust, still oily from the fog.

Little bit of surface rust on the crank would not hurt it long term, although I saw no evidence of that.

Still like to know what exactly makes that noise!

I've seen alitlle bit of surfaced rust on crank bearings destroy several PWC engines after a few hours of use. If this where a engine that had been ran all these years then i might be more willing to believe that its the counter balance or some other worn part. But it's not!
Pull the reed cage and look at them and the piston through the hole where the reeds go. Another strong possiblity is the wrist pin bearing, since the engine was prolly fogged without starting it below the piston wouldn't get touched by the lube. If so, you'll know for sure in a few more hours of use when it breaks a piston skirt from the wrist pin freezing up.

[peter250r]

mate, that is definitely the kickstarter gear. my 86 makes that exact same sound when the kickstarter lever is held down while the engine is running!!!

[Erics350x]

The kick start makes a sound like a ratchet. To eliminate that as the noise, start and hold the kick start down. You'll either hear anouther noise or no change.

[Dammit!]

I'd just go ride the crap out of the thing. If it breaks something was wrong and then it'll be easy to spot and fix afterwards.

Seriously though I don't think you have anything to worry about. All 250R's click like that. Yours just seems louder than most. Could be because it's a stock pipe and a NOS motor that hasn't been properly broken in yet.

[Taiser]

I'd just go ride the crap out of the thing. If it breaks something was wrong and then it'll be easy to spot and fix afterwards. lol

Best advice yet, yeah I think I'll keep riding it and see what happens, she's almost done, then she gets stripped down for the complete make-over. If anyone still has idea's I'm all for hearing them but if she blows well I guess It's an excuse to mod the engine!

Glad I'm not on welfare.

[NewfieBish]

man i started mine up today after watchin that video and realized... mine is JUST like that, except not as loud haha, ive been ridin mine a couple of months now since i got it and nothin's broke yet, and it still got loads of power.. i think its normal..

[DeePa]

runnnnn it...

[devilman]

mine does it also. no one seems to really know what it is.

[Daddio]

mine does it also. no one seems to really know what it is.

It's a 250R!

[fabiodriven]

I swear to you, you just gotta get used to it. I'm tellin ya, my Tecate's been making that same noise forever.