07 Vento Triton, Air & Exhaust leak, maybe By mikey34 (Read 2,775 times)

[mikey34]

OK

So I put a new exhaust gasket on, tightened it with it snug against the engine, but I can still hear a leak somewhere, and I am still getting a very small backfire...

ALSO
When I cover the air-inlet for the air box with my fingers, I can get the scooter to take off, IF I DO NOT cover the inlet, it tries to die when I turn the throttle, I have upped the gas in the carb by ONE notch and that helped for a day, now its doing the same thing...

I also ordered a JET SET for the carb and a small foam airfilter to eliminate the air box...

THANKS FOR ANY HELP IN ADVANCE!

[Alleyoop]

You need to adjust the Carbs Fuel Ratio Mixture:
You do not mention if your motor is a 2 stroke or 4 stroke. They have different carbs and the Mixture Screws are Different for each type. 4 Stroke carbs have a FUEL RATIO SCREW 2 Stroke Carbs had a AIR RATIO SCREW big difference.

But in either case here are the procedures for either one.
Alleyoop

2 Stroke Carb Tuning:
www.scooterdoc.proboards.com/index.cgi?board=intake&action=display&thread=7678

4 Stroke Carb Tuning:
www.scooterdoc.proboards.com/index.cgi?board=intake&action=display&thread=1499

[mikey34]

OH BTW

I found my exhaust leak! It was one of the hoses that went to the California Can! The one that goes into the valve cover! Got it sealed, but I think I will need a more permanent solution, I put a piece of duct tape over it and around it, but I think I need to take the hose off and plug where it goes into the valve cover, as I am still getting a VERY SMALL backfire...

Also it is a 4 stroke, This is a very ODD scooter, its a 49cc, BUT its not a QMB139... Have you ever heard of the maker VENTO?

Any way, I tuned the carb when I bought a new one, after turning it ALL THE WAY IN, I turned the screw COUNTER CLOCKWISE, UNTIL the IDLE had quit rising... IS THAT CORRECT?

BTW after I found my exhaust leak and sealed it somewhat, I could ride without covering the inlet but it takes a while to get to top speed, I BELIEVE its a Mixture issue still... and will try RE-TUNING the carb again...

ON A SIDE NOTE: I think my petcock is now going out, HAHAHA I looked down at the fuel filter, and it was running dry, I put the vacuum hose to my mouth and opened and closed a bunch of times and that seems to have worked for now!

I can't really complain to much because the scooter WAS FREE! hahaha

THANK YOU SO MUCH ALLEY!
YOU... HAVE BEEN AN AMAZING HELP!

[Alleyoop]

Is this what your Talking about the Hose coming off the bottom of the PAIR SYSETM VALVE?
Alleyoop

[mikey34]

YES! I took the rest of the system off and plugged everything else EXCEPT that Hose coming off the bottom.

BTW Can I just buy a regular valve cover(Like the one on my other Scoot) and replace it? Just so I don't have that loop on it?

THANKS

[Alleyoop]

You can take the Loop off by taking those two bolts off the VALVE and save yourself some bucks. BUT you need to PUT A PLATE to cover the hole where the PIPE attachs to the HEAD. You can make your own PLATE or you can buy it: Make sure you plug up the VACUUM HOSE going to the canister AT IT'S ORIGIN.
Alleyoop

[mikey34]

Very Nice!

I just found something else a little weird too, My carb mixture issue I believe, but,
the scooter doesn't want to move unless I "pump" the throttle to take off... If I pump it, 1/4 to nothin, 1/4 to nothin, and then accelerate like normal... it does great! But if I take off and just Open the throttle, it still tries to die... I know this HAS to be a mixture issue, Right?

P.S. The carb needle is set one notch down from middle, (RICHER) and I have my mixture tuned to 2 1/4 turns OUT. I SCREWED THE SCREW ALL THE WAY DOWN, and THEN 2 and 1/4 back out...

[Alleyoop]

Yes, it is a fuel delivery problem, does it do this only when cold or even after the motor is hot?

From the way you describe it does the carb have a PUMP on the right side? Like this:
Alleyoop

[mikey34]

Yes it does THAT is my carb, but on the throttle wheel, the lever that pumps it, doesn't touch the rod until full throttle??

[Alleyoop]

When you want it to pump you usually can adjust that.
Does your carb have a ENRICHER(CHOKE). Also I want to see the side of the pump since you said it does not pump until full throttle. The way you describe it is Squirting extra fuel when you twist the throttle.

Why I say that is twisting the throttle a little DOES NADA MY MAN unless when you do this the motors revs stay up.
Alleyoop

[Deleted]

Oct 12, 2013 17:25:32 GMT -6 Alleyoop said:

Yes, it is a fuel delivery problem, does it do this only when cold or even after the motor is hot?

From the way you describe it does the carb have a PUMP on the right side? Like this:
Alleyoop

Alley, I have that carb. where's the mixture screw supposed to be? looked but couldn't see. its probably a sealed one but it would be nice to know since the 4T carb in the library section doesn't look exact. sorry didn't mean to hijack the thread.

[Alleyoop]

Here is the other side of this carb and on this one the FUEL RATIO MIXTURE IS PLUGGED:
Alleyoop

[Deleted]

Ok yup mines plugged too. Thanks!

[mikey34]

Mine is like that, WITH OUT the screw plugged, This is the screw that I have Turned all the way in and 2 1/4 back out, its the only screw on it, except the idle screw.

I noticed also that when I pull on the throttle sitting still, I have NO TORQUE. If I give it some help and push with my feet it will take off, OR if I pump the throttle up and down real fast it will go ahead and take off... This is weird man, IDK whats goin on. will having that PAIR hose bog it down like that? Could it be stealing my compression?

[Alleyoop]

It could if the VALVE is staying open or broke, all the valve is a one piece flap that sucks in air so if it is staying open It would effect the compression. You could just take the pair system off and plug up the inlet on the head with a metal plate. Then make sure you plug up the VACUUM hose going to the canister at it's ORIGIN.
Also when was the last time you adjusted the valves on the motor it could also be the exhaust valve not closing and sealing.

Does it start up nice and stays idling nice? When you twist the throttle to go WITHOUT pumping does it BOG.
Alleyoop