Scoot makes different sound By prodigit (Read 1,617 times)

[prodigit]

Okay, I know about the PDI, and never dared to open the bike....
The sales site said that all bikes had a PDI done to them before shipping. I knew this wasn't true, because both transmission and engine fluids where too low, but ignored the rest of the bike, thinking they might have done a good job....
Man, I think I was wrong!

I've done 300 miles now, and the bike vibrates, rings, and every time when I accelerate, the sound is annoyingly sharp. I think it might be the exhaust, but am not sure.
Like before it was 'putting' very nice, with a sound bump around 1kHz.
Now these sharp sounds (can't really explain, almost like running a motor without oil, or running without muffler) are so bright, that without a helmet, it hurts my ears to drive.
All started when I did a 50 mile trip at max speed.

You think it could be the muffler? I never did PDI, and never tightened any bolts (they are just too many, and the wiring just drives me crazy, too many wires!!).

On top of that, I wouldn't even know where to begin in stripping the bike from it's plastic covers! I am the type of person who can put a bike together and always end up with a few screws after the mounting...

I presume some loose screws on the exhaust is the problem; but any other suggestions? (I know you're going to tell me to do a full PDI, but man I'm scared of that; at least like this I can drive my bike for however long I can drive it, but when I do the PDI, I might not be able to drive the bike at all anymore!)

[richardthescooter3]

It could be a lot of different things, (that is where the full PDI comes in) what body style is your scoot, I've had my plastic panels off more times then I can count. Have you try putting scoot on center stand and crank it up and try to find where the sound is coming from?

[jct842]

It would be nice to know what kind of a machine you are talking about. It would also be helpful to you if you listed where you are located as there might be some one close enough to help with some hands on. A trip of 50 miles at max speed is probably what would come from a 50cc scooter but it would still be nice to know. WOT on a brand new scooter and chinese oil is a good way to kill it too.

[prodigit]

Sorry,
I have a BMS TXB 260 EFI.

Nothing is dragging, no friction anywhere, just the motor is starting to make more of a sound of 2 hammers slamming together!

[jct842]

check the valves.

[richardthescooter3]

I know I had trouble with mine about 1 1/2 years ago, got loud I thought I blew it up so we took it apart to adjust the valves, check the intake valve to adjust and found the nut came off, took bottom off and by luck the nut was in there. (Hey, you never know?)

[tvnacman]

If you don't try you will never know . Check the muffler mountings they can vibrate and make interesting sounds .

John

[prodigit]

I'm going to check the muffler indeed. The valves are controlled hydraulically; they supposedly don't need any modification or check up for another 30k miles.
I presume some of the nuts where not tightened very well, and sound is coming through the cracks as they loosen.
Time to buy locktite (man, this bike has costed me lots of premium on materials and research hours)!

[rp]

How about your gas. Don't use the low octane, Make sure your using 91- octane or more.
I use Shell 93 in my Roketa MC-62.

Just another tip. RP

[prodigit]

Ok, I went under the 'hood' and found the source of both the ringing sound and the sharper sound came from the exhaust. The exhaust is mounted with two nuts to the motor with an item like picture below.

Much like the picture, but not identical.

Both nuts are gone, and the item of the picture is ringing on the exhaust pipe.

So I got to find the right bolts now.

[tvnacman]

M10
Good find

John

[prodigit]

The rod is 8mm. Would it be M8, or M10?

[richardthescooter3]

try .partsyahoo.com" rel="nofollow" target="_blank">.partsyahoo.com

[prodigit]

Ok, M13 fitted. The ringing sound is gone, and the sharp is still a little remnant, most likely because I did not dare to destroy the nut, and probably did not tighten it enough.

Can't believe that superiorpowersports promises a PDI, forgets exhaust nuts, and engine oil, and transmission fluids!
I'd call that no PDI done to the bike!

I also found some high temp locktite (the white one), but on the bottle it says it's made for things like motor bolts and nuts, and for radiators etc; not really for exhaust.
Any recommendations on aftermarket nuts and locktite/glue for exhaust?
I presume they installed the nuts with vinyl locking, which probably melted after the first run...

[rp]

I used the blue locktite and that seems to be holding.
I got my MC-62 from Superior also and they changed the oil, A/F and (maybe) gear oil.
No One (it has been said) No One - does a PDI like it should be done. Unless you want to pay extra for it. Many of us feel your "1st time buyer" frustration. If I ever get a 2nd one I will hopefully have everything under control before I crank it up.
I just put some "Dyna Beads" in my tires ($20.00). It smoothed out the ride alot.

Continued good luck.