Tuned Pipe Options

[Greg]

Thanks for the jet advice. I'll start at 95 and see where I go from there.

Yeah, the frame bar goes across right under the pipe.
My original pipe did not have the "raised circle" on the header flange.
Instead my original pipe was flat across the header with a very slightly raised ring.
My original cyl and pipe setup never used a gasket.

I'll need to get under it and take a better look. That raised ring on the new pipe may be already fitting into my cylinder and I just don't know it. It is definitely a nicer designed header flange than my original pipe.

[Greg]

The pipe is on.
I tried without gasket and with. There is no more clearance without the gasket even though the pipe fits up further in the flange of the cylinder.
So I may scrape little. I may try riding it for a while to get the pipe hot, then try to slightly bend the pipe up by prying something between the frame and pipe.

Here is my finished mounting:


I used some of the bracket from my original exhaust which let me keep my "inner fender"and it gave me the spacing I needed.

I'm off Mon and Tues and unfortunately it looks like it is going to be indoor recess so I can't tune it. :-(

[90GTVert]

The pipe looks good. What they did with the frame on that scoot sucks. It looks like rather than using the typical ceneter stand that attaches to the minarelli engines, they stuck the big frame extension out there and attached a center stand to it.

[Greg]

True.
But on the bright side, my center stand does not touch the pipe at all. Hmm, I may be able to bend the frame down slightly.

Here is a better view:


My guess is Jonway did it this way because this frame is used for 50cc and 150cc models.

[90GTVert]

That's what I figured. Looks just like the frame on some 150s. I would say you could take the pipe to someone with torches and get them to heat and bend it slightly. I don't think the pipes coating would like that too much though. It looks like maybe you could grind or bend the top of the frame just a little and that would take care of it.

[2strokd]

It does look very nice! I wouldnt bend it though!
Be careful if you do!
That is different how they did the center stand huh?
Good thing it dosnt face the other way!
Have you considered removing it? Or do you like the
center stand more?
Nice scooter BTW!!!

[Greg]

Thanks.
It's a fun scoot to ride, although it doesn't do wheelies like yours. Maybe if I pull really hard.
For now I am going to leave the pipe alone. It is only a minor rub. It may eventually rub the chrome off at that spot but it won't be seen.

Removing the center stand won't help.

Here is a better angle of it:


The frame remains if the center stand is removed.

[90GTVert]

It looks like if you took the pipe off you could fix your rub in a few minutes with a grinder and then repaint the frame there so it doesn't rust. The bad part about chrome chipping off in one spot is that it often continues to flake off once it starts or you may just get rust there.

[Greg]

Excellent advice.
I did take the pipe off and grind and re-painted the frame.
Jetting was a breeze. 95 was a great start. When the motor heated up it had a slight bog. The bogging sounds interesting in the new pipe. It's more of a "crackle".
Anyways, I thought I may still have been lean and jumped to a 98. That is when I knew I went in the wrong direction as it ran like a badly fouled plug. It is running great with a 92 in it now. The 92 hit the same speeds as the 95 but didn't bog when it got warmer.
The pipe came with 4.5g rollers and yellow springs. I put the yellow spring in, but used my 5g sliders instead.
I only took it for a test ride of like a 1/4 mile. I think I'm all set. I just got to get some better weather to take a longer ride.
Any idea what RPM these yellow springs are? It was an adventure getting them in.

[90GTVert]

Those yellow springs are probably 1500RPM.

Let us know the new top speed once you get more ride time. ;D

[Greg]

I strapped a GPS to my forearm using Saran wrap and went out to take a ride.

On my first flat, it got to 54.
The next flat I got it to 55.
Slight uphill it goes about 50/51.

I haven't tried getting a good reading downhill for a max speed.
I had the perfect hill for it, but my "GPS mount" was getting too flimsy, also a patrol officer was up ahead and it was only a 45 MPH zone.

I'm happy with the results!

[90GTVert]

Very nice. Prob for the best that you didn't roll by an officer doing 60 in a 45 on a 50cc. lol

:scoot: :cop:

[lshigham]

Oct 8, 2010 18:19:01 GMT -5 90GTVert said:

Very nice. Prob for the best that you didn't roll by an officer doing 60 in a 45 on a 50cc. lol

Been there, done that :scoot: