flooding won't idle

[whiterabbit]

I have a minarelli clone 50cc 2t made in Taiwan, rebuilt top end, new carb, new crank w/ bearings and seals,leak down tests affirmative on airtight.Plug is wet and hard starting when cold, I live in Florida so not that cold, will run and rev up nicely when warm and start nicely again after being warm but let cool down for twenty min and hard start. Anyways when started and warmed up it will not idle will rev but not idle. My thought is that I put a gasket that I made myself on bottom of intake manifold with some ultra grey thinking I should not have done that? Will that have an effect on the diaphragm allowing to much gas in the reed valve causing it to flood? CVT all works like it should just an idling problem. If I hold the throttle just a tiniest bit I can get it to idle but sounds like too much gas as it's kinda boggy on low rpms,will rev up just great?? any ideas. Been reading everything on the forum and can't find a match to my specific problem.

[whiterabbit]

Just want to add that when I hold throttle to simulate an idle at lowest rpms and still run , I'll hold my hand close to the air intake on carb and can get a slight mist of gas on my fingers.

[whiterabbit]

The gasket is between the intake manifold and the reed valve assembly, I've read there should not be a gasket there. Could that cause flooding if I installed gasket where maybe I should not? :panic:

[skuttadawg]

What size idle and main jet ? Airbox , Uni or K&N airfilter ? My 2T I have to adjust the idle speed everytime the temperature changes . Wait until its warm to adjust as it should idle higher when cold with the choke engaged .

If you rebuilt it recheck the torque on the head nuts as you should after rebuilding and letting it get warmed anyways .

Does it have gas coming out of the overflow hose ? If the float or float valve is allowing in too much gas you may be able to bend it slightly

What size of carb ? Inspect the reeds for wear along with the reed cage gasket . Do you have all of the vacuum hoses attached ? 2Ts are more finicky on jetting than a 4T

Do a plug chop to see how the jetting is and here is a chart to compare yours with www.4secondsflat.com/plug_chart.html

Bogging can be from flooding with too much gas and also too much air and lean . I took off the air box cover just for fun to see how it would do and it bogged so bad I did not get out of the driveway

My 2T came with a 19mm carb ( most have a 17.5mm ) 40 idle jet and 68 main jet and never had an idle issue . After putting on a BBK it would stall at idling or just before coming to a stop with stock idle jet and larger main jet . I tried a few MJs until it ran right . I would get the Uni wet with a 130 MJ and sputter but not bog . Bogging is bad so it needs to be addressed . I always gave it just a 16th of a turn of throttle right when it starts up and then it would idle on its own . Starting with no throttle it would often run for a few seconds and die .

Recheck for intake and exhaust leaks . If you spray starting fluid around the intake instead of in the path of incoming air ( not starting fluid has ether and it will eat up seals and rubber so only use to check for a leak ) and if it stalls then you know you have a leak as it is getting sucked in

[whiterabbit]

Leak down test 3 times with airtight results, new carb, standard jog replacement for minarelli, new reed assembly, new intake manifold. No gas from overflow, not using airbox and will run just not idle,never rode the scooter just finished with rebuilding blown crank and piston. I'm flooding, pretty sure of that, my first question to my self is that I put a gasket on the intake manifold and after some research found out that it doesn't need one? So would that gasket and sealer I put on intake be the cause of flooding, everything is stock, nothing fancy.

[skuttadawg]

Check the jet size and inspect and clean if needed even if new as you may have old gas in the line when it was sitting up . Put some SeaFoam in the tank as it really helps . I let mine setup for 2 months since I ordered too large of mainjets and the seatlock broke so I had to break it in order to lift the seat and put in gas and oil .

I would try putting the airbox back on as a 2T is very picky on the jetting and with a Uni or K&N you would need to try more than one size of jet in order to get it tune . Have you replaced the fuel filter ?

I would think you may use an oring instead of gasket unless the intake came with it .

Other than idle how does it run at midrange and top end ? What 2T oil are you using ? NEVER use weedeater crap and try to use any brand of synthetic blend at first and full synthetic after its broken in . I really like Motul 710 but hate paying 17 a quart . I ran low and Cycle Gear was too far to ride and chance it and I found Lucas synthetic blend for a mere 8 bucks at Oreillys . The cheap stuff smokes which can let you know the oil pump is working as my pedal mopeds left a com trail behind . With Motul 710 and the Lucas it only smokes at start up when its cold and I monitor the oil level at gas fill ups and in between .

So what is the carb mm and jet sizes ?

[whiterabbit]

www.alpha-sports.com/ If you scroll down to the LS scooter single seat thats my scooter. the carb was replaced with a scrappydog replacement. Revs up mid to top end sitting on stand like a raped ape but like I said I haven't even rode it yet, bought all seized up. Cleaned up everything and replaced with stock parts. I used peak 2 stroke oil from pep boys

[whiterabbit]

actually just checked link and you have to scroll the parts diagram then scroll down to LS single seat at botom of page

[whiterabbit]

shoot, I'm having a hard time here www.alpha-sports.com/ scroll the parts diagram to alpha sports atv/bikes then scroll to LS single seat at bottom of page, thats the scooter.

[whiterabbit]

Lines were cleaned out pet cock works as should gas is fresh and I used an ounce of seafoam in tank w/ 1 gallon of gas. Brand new plugs which get wet with oil and gas which is probably why hard start and no idle. Once started runs strong, sounds good just won't idle??Flooding I think, Not sure what the jetsize or carb size is but it's on scrappydogs sight under JOG Minarelli 1E40QMB first carb you come to

[90GTVert]

Put the airbox back on. Adjust the idle mixture and speed settings. Just because you feel a little bit of fuel coming from the carb, it does not mean that it is flooding for sure. 2T reed valves aren't the most efficient. It could mean the reed valves aren't sealing against the reed block as well as they should, but it's fine with a gasket on each side of the reed assembly.

[whiterabbit]

Hey Brent, yeah put the airbox back on little improvement, plug not wet but running quite rich, backed off the pilot air screw makes really no difference. The replacement carb is a little smaller than the mikuni I took off, went cheap instead of a re-build, thinking of taking main jet from mikuni which is noticeably larger and plugging that in. I took off head and cylinder to check piston and rings, lot of black going on. Is there an adjustment on the oil pump? Or is what you get is what you get? I'll try backing out air screw and adjusting slide valve leaner, move up I think I read, will check. Just need an Idle, how can such a simple design become so complicated. Other than the fact that I'm a rookie 2 stroker :panic:

[90GTVert]

I'd leave the oil injection alone for now. Work on the tune. If it runs well on WOT, then leave the main jet alone. If not, change it. Just don't change the main jet to work on idle. Main jet can affect idle and starting, but that's usually when the jet is way off.

Have you checked to see if the auto enricher is working?

[whiterabbit]

No, not exactly sure how to check it, I notice a screw type adjustment on top of it, shall I adjust?

[usmcdoc]

A 2T carb should not have a diaphragm...they are of the 'slide' type..copies of Mikuni carbs where the slide is moved by a cable not engine vacuum. Your a/f screw may need to be adjusted. Mine was just the opposite..would not start or idle with holding some throttle...a/f was to far closed..not allowing fuel to the pilot jet...turned it a bit and she fired right up..so maybe yours is too far open...I would check that as well.