Noise?

[12Bravo]

What the bottom end sound like when it's not doing so well?

I heard something that didn't sound right, but I'm new to 2t's so it all sounds funny.

[GGRider01]

Well. Rattling, clinking and clanking are all bad. Be ware, some powervalves rattle and that isn't a bad thing, but is annoying.

Grinding is a bad sign.

If it sounds like a jar full of marbles rolling across a table, that is bad.

All this aside, the GasGas seems to be a noisy engine and transmission anyway. The clutches are known to make sound under heavy load.

If the bike has low hours with good oil, I'd keep riding it.

[12Bravo]

It's has unknown hours on it and I can't say the maintenance was done very well. It looked clean, but as I dug into it more. I have found simple items that all bikes have in common. All the basic stuff I did to my Harley I did to this.

It doesn't sound like grinding, more of a rattle when at lower RPM and just chugging along.

[jostby]

Typical gasgas chain slap. Very noticeable at low rpm's when getting on the gas. Tighten it up a little and try it out.

[poelinca]

Originally Posted by jostby

Typical gasgas chain slap. Very noticeable at low rpm's when getting on the gas. Tighten it up a little and try it out.

Oh, that's why it sounds from the left hand side and on very low rpm (gears 3-4-5, never heard it in 1 and 2). I've been chasing that rattle for a few rides now.

Thanks for clearing it out

p.s. chain slap looked good when i bought the bike, will have another look at it tonight

[motopsycho87]

Originally Posted by poelinca

Oh, that's why it sounds from the left hand side and on very low rpm (gears 3-4-5, never heard it in 1 and 2). I've been chasing that rattle for a few rides now.

Thanks for clearing it out

p.s. chain slap looked good when i bought the bike, will have another look at it tonight

Here's my old KTM 640 with a very shagged bottom end. It's similar on 2 strokes, a lot deeper rattle than the top end https://youtu.be/Avb-GXMWT6E

[poelinca]

Originally Posted by motopsycho87

Here's my old KTM 640 with a very shagged bottom end. It's similar on 2 strokes, a lot deeper rattle than the top end https://youtu.be/Avb-GXMWT6E

Thanks for the video.

Mine does the rattle only while moving, and on higher gears (3-4-5) when on very low rpms. It goes away fast at times, or slower depending on how much gas I'm giving it.

[12Bravo]

Originally Posted by motopsycho87

Here's my old KTM 640 with a very shagged bottom end. It's similar on 2 strokes, a lot deeper rattle than the top end https://youtu.be/Avb-GXMWT6E

Oh wow, mine doesn't sound anything like that.

Mine might just be me not knowing much about 2t's

[motopsycho87]

Very common in the Gasser's is;

Exhaust rattle - put your foot on the exhaust and rev, does it go away?
Power valve rattle - take the right hand cover off, in the rest position is the cam firmly against the stop?
Clutch rattle - pull the clutch lever in, does it go away?
Engine mounts - are the top mounts intact? They tend to snap, are all mounts tight? If so, remove the nuts and replace the nylock nuts
Clutch hub nut - take the plates out, does the centre nut turn?

[Jakobi]

Originally Posted by motopsycho87

Very common in the Gasser's is;

Exhaust rattle - put your foot on the exhaust and rev, does it go away?
Power valve rattle - take the right hand cover off, in the rest position is the cam firmly against the stop?
Clutch rattle - pull the clutch lever in, does it go away?
Engine mounts - are the top mounts intact? They tend to snap, are all mounts tight? If so, remove the nuts and replace the nylock nuts
Clutch hub nut - take the plates out, does the centre nut turn?

Bang on the money!

Plus add in anything else that has the potential to make contact under vibrations. Plastics that have some give, loose washers, skid plates contacting frame rails, rad shrouds against the rads/brace housing. Even rad braces themselves.

Comes down to not stressing over what you hear immediately; its easy to fear the worst! and doing a little investigation into possible causes. Onces identified look at resolving/living with it depending on your tolerance.

The above list is a great place to start looking!