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

**KASEY** · 09-22-2008, 10:47 PM

that sounds like a 250r to me,,,,

**Taiser** · 09-23-2008, 08:07 AM

Thanks for the input guys...yeah it sounds pretty scarry at first but aside that it runs flawlessly, even idles!!!

Again my 2-stroke xp is limited to motorcross and ski-doo's, but none of them made this sound.

, your engine sounds a lot like mine, especially at idle. I'm trying to make mine 100% stock so I do have the stock pipe but i may update the pipe later on. That would probably drown out the sound because when I hit the gas the sound goes away with the engine rev's so a louder pipe would likely mask it.

My noise might be sounding a little harder to you guys because I used a pro camera from work to record it...don't know, but again it runs great and I don't really want to tear into a less than 10 hour new engine to find a phantom noise, not when the thing will pop wheelies in 3rd gear without even trying!

On the upnote, she's almost done!

Just ordered new rad fairings (oem), and brakes (yeah I was booting up and down there with zero brakes!

Need a new wheelie bar and rear plastic. Then I tear her down again and do the full new paint rebuild. Still not too bad for a bike that every part of it came off of e-bay!

**Erics350x** · 09-23-2008, 08:37 AM

Originally Posted by fabiodriven

No offense, Eric, do you own any 2 strokes? That would be a terrible noise for a four stroke, but mines been making a similar noise for years, and I don't baby her...

None taken, but for the record
I've been riding them for 25 years and was raised in a shop. If you listen alittle closer you can hear what he's talking about. It's not a normal noise. It may be just counter balance noise, but it would drive me nut's!

**Kintore** · 09-23-2008, 10:14 AM

Your all set, no worries. My duncan PV 265 does that as well!

**Nick_R_23** · 09-23-2008, 01:43 PM

After reading this I feel a lot better, my 250r makes a slight knocking sound from the balancer, and I was about ready to tear down my motor and replace all the bearings!! After revving it up it goes away, but I didnt want to scatter my engine on the trail from bad bearings. Guess I dont have to now!

-Nick

**Jonpin** · 09-23-2008, 01:50 PM

It sounds like when you kick a bike over and have the kicker down still but louder i think and if thats normal for a 2 stroke to sound like more the reason not to get one i would go crazy hearing that all the time ,good luck resolving the problem.

**Dirtcrasher** · 09-23-2008, 04:29 PM

It does sound like most R's but something sounds a bit loose to me....

If you want some piece of mind grab a gasket kit.

Take off the left cover and see if there is any play in the crank, you can get to the counter balancer on that side too and make sure they're tight and the holder isn't broke. My holder was cracked.....

Then you can take off the right cover and do the check on that side, it will only cost you 2 gaskets.

That helps you rule out most of it.

If it's a "newer" motor, then hopefully whoever did the work checked the lower connecting rod bearing.

**300rman** · 09-23-2008, 06:59 PM

my air R sounds like its coming apart when its running.....and its 100% fresh....i know air and water cooled are night and day difference, BUT.......

**Taiser** · 09-23-2008, 07:43 PM

Originally Posted by Dirtcrasher

If it's a "newer" motor, then hopefully whoever did the work checked the lower connecting rod bearing.

It's literally factory new, never been opened. If you listen at the end of the video after I come back from the quick boot, it seems to be louder!

I'll look into the crank, never know what could be up in there but to me it seems like it's coming from near the reeds, someone on youtube said it could be from the starter gear too?

**Dirtcrasher** · 09-23-2008, 08:09 PM

Starter gear?? It doesn't have a starter gear

Listen to whoever and whatever gives you piece of mind. If it was a NOS motor, it's very well that the mains or something else could be the problem.

New doesn't mean much, was it stored in a dry area for 20 years? Did the bearings dry out?

350X motors cranks that sit for 2 decades lay in oil all that time, 2 strokes rely on the premix oil that lubes them, the more they sit the drier they get including the lower connecting rod bearing.

No need to get crazy about it, we can all come up with our own ideas and or thoughts, but if you check it out best you can than thats all you can do..........

Whats the history on this motor??

**cybrman** · 09-23-2008, 09:04 PM

It could definitely be something with the kickstart, spring messed up or something. Not sure how the 250r's are put together but I've had that noise on a 250sx with a spring that got wound around 180 degrees. I managed to heat it up and reshape it but I swear to this day I can still hear a small sound roflmao makes me crazy!
The sound I heard sounds like it could be similar. Only one way to find out. I'm with DC pop the cover off and have look.

**Erics350x** · 09-23-2008, 09:32 PM

Originally Posted by Nick_R_23

After reading this I feel a lot better, my 250r makes a slight knocking sound from the balancer, and I was about ready to tear down my motor and replace all the bearings!! After revving it up it goes away, but I didnt want to scatter my engine on the trail from bad bearings. Guess I dont have to now!

-Nick

Goes away with rev's? Sounds like you have a bad main bearing.

**Taiser** · 09-23-2008, 09:36 PM

Originally Posted by Dirtcrasher

Starter gear?? It doesn't have a starter gear

Listen to whoever and whatever gives you piece of mind. If it was a NOS motor, it's very well that the mains or something else could be the problem.

New doesn't mean much, was it stored in a dry area for 20 years? Did the bearings dry out?

350X motors cranks that sit for 2 decades lay in oil all that time, 2 strokes rely on the premix oil that lubes them, the more they sit the drier they get including the lower connecting rod bearing.

No need to get crazy about it, we can all come up with our own ideas and or thoughts, but if you check it out best you can than thats all you can do..........

Whats the history on this motor??

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!

**fabiodriven** · 09-23-2008, 09:42 PM

I say it's normal. Just my .02-

**Daddio** · 09-23-2008, 10:16 PM

It,s a 250r. They make funny noises. They run like a scalded dog. Ride that sucker for a while and if it gets any worse then worry about it. Chances are you will get used to hearing it first, unless of course you choose to sell it to someone else. If you buy another one, it too will make funny noises.
I think it,s the nature of the beast.

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

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