Strange tube.

[jmoney08]

When I installed my aftermarket exhaust there was a rubber tube/hose that connects to my airbox and was also connected to the exhaust. Now it is just sitting in tjere not connected to anything because there is nothing on the exhaust to connect it to. What should be done with it? 08 Zuma with Leo Vince Zx pipe. Thanks in advance for any help!

[yosemite]

Take the hose off the Airbox and Plug up the connector by the air box. There also should have been a Vacuum hose going to a valve by the exhaust or up further. That Vacuum line needs to also be plugged AT ITS ORGIN either on a "T" or "Y" or straight from the INTAKE MANIFOLD,
Otherwise you will loose VACUUM for your petcock and carb.
Sam

[jmoney08]

There are only two hoses connecting to the airbox. One went to the exhaust and the other goes to the carb. I think but I am not sure. I can remove the one that went to the exhaust but how to plug it? I am sorry to be so ignorant but I have no idea where the exhaust manifold is. Are there photos of the 08 Zuma setup that would help me??

[yosemite]

You have to take the pictures of what is on there because they put different types on different years and different emissions EGRs, PAIR and EVAP systems. But if you show us what is on your scoot we can tell you exactly what you need to do and what needs to be plugged up and or HOW TO PLUG THEM it all depends on what they put on. Some have Black canisters that hoses to and then to other places etc.
Sam

[jmoney08]

Ok. I will do that this Saturday as I will have the day off and plenty of time to do so. Thanks again for the advice. It is very much appreciated.

[yosemite]

Not a problem we will get you squared away with all the emission stuff and get it all off the scoot. That way you will only have a couple of hoses and a much cleaner Carb area with less things to go south.
Sam

[jmoney08]

Ok, I went in there and poked about. What I thought was the air box wasn't, it was an air cleaner sitting on top of the clutch / variator housing supplying air to the inside of that housing. The actual air box has an intake opening and the air goes through an oiled foam filter and then through what appeared to be a cloth-like filter that looked like a fine fiber carpet cut really short. From there the air goes to the carburetor in a large tube and a smaller tube sends air to the air cleaner thingy on top of the clutch / variator housing. The tube I had a question about connects to that. It came from the stock exhaust but is now just sitting there but still connected to the air cleaner for clutch / variator .

[jmoney08]

I am just getting frustrated as the scoot, purchased brand new from a Yamaha dealer has NEVER gone over 37 mph. When I see all the posts, I wonder what my problem is. I stopped by a scooter repair shop yesterday and they said the pipe was killing the horsepower and with the setup I would need the air jet changed and they also suggested going with a 70cc kit. The only thing I have had done is jetting and the new ZXR pipe. I had a different scooter mechanic do the jetting but don't know if he did it correctly (air jet). He also changed rollers and that's all. I could do or have done the throttle cam mod but what else? I sometimes feel like these mechanics are just guessing. I could be wrong. I am confident that someone here knows what to do with my scoot. Thanks for any help as I have spent $500 already and all I have to show for it is a cool looking exhaust....

[payneib]

Feb 9, 2013 11:28:34 GMT -5 jmoney08 said:

has NEVER gone over 37 mph....................they also suggested going with a 70cc kit.

It's a 50cc right? I did my CBT on a 50. With 217 pounds of me on it, it got up to 20mph easy, then struggled it's way up to 35/37mph. Without going for a bigger displacement, you won't get much more out of it IMHO.

[jmoney08]

Yessir it's a 50cc. I started doing this originally just to be a bit less of a burden on the roads because most here are 45mph where I I ride. I thought it would be somewhat easy to do but it has turned out to be quite an animal. Most of my frustration comes from being so ignorant. I know I'll learn so trying to be patient just now. Thanks for the post sir!

[payneib]

You could maybe get 40mph. Bigger intake, bigger exhaust, jetting for more fuel, etc, etc. most of which you've done. But for it to hold its own at 45mph, you'll need the extra cc. Could you maybe trade it in for a 125? I don't know what licensing laws are like your end (I'm UK), but even with my fat body on the seat, my 125 holds 60 nicely.

[OverReved]

You need to look at the whole bike and determine what the most damning restriction is. If you do not know what the "slowest" part of the bike is, how do you expect it to go faster?

Intake ( airflow)
Intake ( clogged filter)
Exhaust (airflow)
Carburator (airflow)
Carburator (fuel flow)
Ignition system (RPM restrictions)
Gearing ( top speed restriction)
Gearing( take off speed restrictions)
Engine ( operation outside the power-band)
Engine ( heavy internals limiting RPM)
Engine ( low compression by design or damage)
Engine ( poor lubrication)
Engine ( poor airflow in the head due to internal geometry and components)
Drive train (slipping components: clutch pads, belt )
Tires ( drag from large cross section or overloading)
Tires ( under inflated)
Driver ( too large for cc or acting as air brake when riding etc. )
Terrain ( Florida is fairly flat)
Emissions systems ( a melted catalyst will hinder performance )
Emissions system ( an improperly operating EGR system will hinder performance)
Parasitic loads ( anything from frozen wheel bearings to dragging brake pads)
Parasitic loads ( air drag from plastic components on bike to excessive on board storage weight)

50cc is a small engine but it's very possible to peak reach 45 for appreciable distances with that size engine on regular fuel with a 4 stroke and maintain fantastic fuel mileage. Even more possible to go much faster on a 2 stroke.

[jmoney08]

Thank you overreved. I don't know, and as I said before, I am new to this and terribly ignorant of 2t engines and all that goes into making the scoot faster. I am only 175lbs and the scoot doesn't even have 3000 miles on it. I would assume everything is still fine but I will do my best to go down your checklist. "How do I expect it to go faster" is why I am trying to learn from people like you. Thank you for your post and time.