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Post by jwgarber1725 on Mar 27, 2013 22:33:08 GMT -5
Alleyoop...
As usual you were right on the money.
When I took off the carb again to double check everything I went to work on that brass piece covering where the A/F mix screw is.
I finally got it OFF the carb and sure enough there is a A/F screw there.
I drained the entire tank of gas just in case I had water in the gas. Just to be sure it was not the issue.
So I have a empty carb and gas tank
I turned the carb A/F in until snug. Then I backed it out 1 and 1/2 turns.
Put in a bit of gas
and it fired right up and idled.
It did not die until it ran out of what bit of gas I put in it.
I am out of gas so I cannot fill it up with anymore but I think the issue is solved now.
I will let you guys know sometime after I get some fresh gas back into the tank and get working on it again.
Thanks Alleyoop for getting me to check for that A/F screw again. I was told by another person that its possible some 2T carbs would not have an a/f screw so I was sure mine did not.
I was wrong.
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Post by jwgarber1725 on Mar 21, 2013 22:07:24 GMT -5
This is crazy...
You are most likely 100% correct and I probably just did not see the screw down the channel. I will look closer when I take the carb off again.
Dumbest thing I have ever seen. I hope its a simple cap and not some weird screw with no cuts in it or some bs.
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Post by jwgarber1725 on Mar 21, 2013 21:57:36 GMT -5
Then your missing the screw if you look at the carb from the air intake side you can EVEN see the Point of the SCREW in the hole blocking the amount of air coming into that air passage. If it is missing no wonder you cannot get it adjusted. The fuel is constant on these carbs depending on the size of the jets so the adjustment is to either give it more air or less air. If no screw there it will run lean. As far as a Spring on the Idle Speed screw any spring will work maybe a ballpoint pin spring if not just go to the hardware store and get one. You need a little pressure so the screw does not vibrate out. I will not vibrate in because the Slider is pushing down on the screw so it will vibrate out. Alleyoop  Yea I looked down that channel and there was no screw. The carb on the other bike seems to be exact same way. Just a brass cover is there with a tiny hole in the middle. When I get a chance probably on monday I will take that carb back off and double check to be 100% sure. I will try to track down a spring for the idle screw as well. Id say the ballpoint pin spring would fit fine. any clue why this thing would have just a brass cover and no actual screw? |
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Post by jwgarber1725 on Mar 21, 2013 21:21:07 GMT -5
If you have a 2t with a Slider Throttle cable going into the top center of the carb THE CARB HAS an AIR RATIO MIXTURE screw and it is on the RIGHT SIDE near the AIR FILTER INTAKE SIDE. The IDLE SPEED SCREW is in the Center of the CARB to raise or Lower the SLIDE to raise or lower your IDLE. I put together how to tune each type of carb a CVK and or SLIDER carb. Go read this How-To I put together. Alleyoop itistheride.boards.net/index.cgi?board=tt&action=display&thread=53I looked inside the carb when it was off the bike. Looking in from the "Intake" side of the carb you can see the channels including the one the A/F mix screw would be used to restrict or allow more air into the channel. Here is a Picture of a similar carb online it is not the one I have but I can demonstrate the screw layout with it.  The white circle is the idle mixture screw. Mine has no spring on it though. the red circle is the A/F mixture screw and channel. However on my carb its a simple small brass washer there with a hole in the middle of the washer. I will take the carb off and inspect it again but I was positive no screw was in there, just the washer. I hope the I am wrong because if there is a screw there it would make adjusting things a of a lot easier ADDED INFORMATION Ohh better picture from your Guide LOL  The silver air ratio screw you show there is where the brass piece with a hole in it is on my carb. That is my exact carb 100% |
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Post by jwgarber1725 on Mar 21, 2013 19:53:14 GMT -5
Ok ... So
A while back I bought 2 Roketa MCR-15-50 Scooters
Both 2-Strokes
I finally got to assembling mine and have yet to have it running properly.
I got it to start and run and it seemed ok .. took it 5 miles to a restaurant. Ate something about 35mins.
Came back out and it would not stay running.
Below are the symptoms
1. Hit Starter Button with break lever pulled
--- Motor starts and revs up to either a really high or low RPM depending on where I have the Idle Screw Set.
Then it turns off. It simply will NOT idle and stay running.
This carb has NO Fuel/Air Screw it is a Slide carb with throttle into the TOP
My air filter box has a snorkel coming out to the Carb intake side.
Then right beside that snorkel is another small snorkel that is connected to nothing.
If I cover part of that small snorkel with my finger I can make the bike start up and it will rev to idle point and stay until I pull my finger off. If I pull my finger off the hole it will slowly rev down and then die
So I am thinking since I cut air off and it revs there is a vacuum leak somewhere but I cannot see any obvious leaks or issues.
What I tried
1. Cleaned carb no carb spray just tore it down pulled the jets and ran wire through em. the carb was spotless inside and I mean spotless.
I could see light through the jets and blow air through them freely.
2. Adjusted the idle screw to no end!!
My idle screw also does not have a spring on it.... shouldn't the idle screw have a spring??
My idle screw is awfully long as well. It seems it has to be backed wayy out to keep the slide at a reasonable level.
Trust me it IS an idle screw its not a A/F mixture screw. The spot a AF screw would be is capped off and looking inside the carb itself there is NO screw there.
That is all I have tried. Nothing works.
If I get the bike started by choking the airbox snorkel with my hand then hop on and manage to take off it stays running until I stop and try to let it idle.
So what you guys thinking
Air leak, bad carb issue somewhere, bad gas what!!
Any help would be awesome
Thanks
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