'87 GN250 with engine clicking & ticking?

[h0dgep0dge]

I recently bought an older nth hand Suzuki GN250, and at time of purchase everything seemed fine. The first thing I noticed was the noise coming from the engine. A strange clicking, tapping, or ticking noise. After some research I'd learned that this could be valve noise, requiring a valve clearance adjustment. Fast forward about a week I'd gotten the valve clearance adjusted properly according to the manual, with a proper tappet adjustment tool, feeler gauge, and all. No joy. Since then the noise has been getting gradually worse, and it really has me worried. My question is where should I look next for the problem? Is this even worth worrying about, should I just ignore it?

If you care to have a listen, I've uploaded some recordings here: http://h0dgep0dge.github.io/gn250.html
One is the raw recording and the other is the same recording, with a 2KHz high-pass filter.
Throughout the recording I rev the engine from around 1250 up to 4000 and move the microphone close to and far away from the engine. Listen all the way through to get all the information.

Cheers.

EDIT: So apparently there is no way to edit the title. It's just a typo, ignore it

[buggerit]

Billy Goat Gruff?

[h0dgep0dge]

Billy Goat Gruff?

What are you referencing?

[buggerit]

What are you referencing?

Hunting And Fishings new cookbook, "Catching,cleaning and cooking Trolls and other small game"

[Murray]

I wouldnt ignore it!!!

Is it using oil???

[ducatilover]

Has it even got oil?
If I remember to PM you when I'm back in Hatsings I can have a look at it for ya, I think I might still have a few GN parts floating around

[h0dgep0dge]

I wouldnt ignore it!!!

Is it using oil???

I don't know if it's using it up, but the level is fine as of right now, perhaps 2 or 3 mm below full.

[Murray]

similar noise to what I had in wifes GB400 and it was a broken cam chain guide. Doesnt sound like valves. As said above it almost sounds like it has no oil in the engine??

sorry cant help much but hopefully someone can

[h0dgep0dge]

As said above it almost sounds like it has no oil in the engine??

There's certainly oil in the engine, though is it possible that it's not being circulated properly?

[Pumba]

Man I dont remember my old GN sounding so tractor like. Never did record it though. If you have adjusted the valve clearance my next suggestion would be checking the cam chain and chain guides.

[h0dgep0dge]

Man I dont remember my old GN sounding so tractor like. Never did record it though. If you have adjusted the valve clearance my next suggestion would be checking the cam chain and chain guides.

That's what the manual suggests. I'm currently in the middle of a move, and I don't know yet how involved the procedure is, so I may have to wait a few days before I can take a look. I'll report back when I do.

[ducatilover]

GNs do wear the cam journals quite often, and they shit guides, tensioners and chains. I probably have guides, tensioners and chains, doubt I have a head though

[h0dgep0dge]

I've just gotten around to taking a look, and so far I've got the cylinder head cover off. If anyone has any advice on exactly where to go from here, that'd be great. I've only had a look at the faces on the rocker arms, but I'm not sure what I should be looking for there. They look like they might be worn, but it could also be regular grinding marks. They're slightly convex, that's really all I notice. I can post pictures if anyone wants to see anything.

[Akzle]

I can post pictures if anyone wants to see anything.

titties .

[h0dgep0dge]

similar noise to what I had in wifes GB400 and it was a broken cam chain guide.

Just pulled the cam shaft and one of the cam chain guides out, nothing of note yet. I'll get the other guide out later and post back.

[FJRider]

I recently bought an older nth hand Suzuki GN250 ...

1st mistake ... 2nd hand is MUCH better ...


The trouble begins when the noise STOPS ...

[ducatilover]

I could have a pek at it if I get time. Where in the HB are ya?

[h0dgep0dge]

I could have a pek at it if I get time. Where in the HB are ya?

That'd be great, I'm in Napier. PM me!

[husaberg]

I was once in involved in a quiet down a Suzuki LT quad repair where the cam chain tensioner bolt was made longer.
I didn't fix the shagged cam chain but it sure made the symptoms disappear, it was a trade-in subsequently sold as a ""whitebaiter special"
............:laugh:

[BlackSheepLogic]

Could be anything, take it in to get ithe source diagnosed before something else expensive brakes. I had an old bike that made a ticking sound, ended up finding a chipped gear, was not a cheap fix.


I recently bought an older nth hand Suzuki GN250, and at time of purchase everything seemed fine. The first thing I noticed was the noise coming from the engine. A strange clicking, tapping, or ticking noise. After some research I'd learned that this could be valve noise, requiring a valve clearance adjustment. Fast forward about a week I'd gotten the valve clearance adjusted properly according to the manual, with a proper tappet adjustment tool, feeler gauge, and all. No joy. Since then the noise has been getting gradually worse, and it really has me worried. My question is where should I look next for the problem? Is this even worth worrying about, should I just ignore it

[Jrom]

Did you ever find the cause of this noise? I think mine has the same