Carb problems, scooter boggs By rsw1158 (Read 2,949 times)

[roketa250]

After all this time something points me in the direction of me having a Yamaha clone not a honda! Is this bad? I may have been misinformed all this time.... I decided to snoop around in the Jonway parts since seeing on the headlights last night it had YY250T on them.... What was I thinking? Maybe it is a Jonway after all... Although all Roketa parts match up perfectly. Seing as they are the same company? Looking to get some clarification on this!!! Thanks guys!

[Alleyoop]

Well without the air box your most likely LEAN a lot of air and not enough fuel. So for the bogging and or surging do not even bother right now until the AIR BOX and FILTER is put on because that will change the way it acts dramatically.
Alleyoop

[roketa250]

Get a load of this.... I can't make heads or tails of what this plug like thing is going into the crankcase? Oil sending unit like on a car. I don't know how to change it. Does anyone know where another part like this is? It's leaking oil from the case.... Not to mention someone did a bang up job. The more I delv into this bike the more I find that freaking home wiring attempt. Take a look at the plug going to the CDI. Now that's not supposed to be like that! Any tips, tricks, or help would be much appreciated all mighty scooter gods! 

[Alleyoop]

WOW!! You need to splice in some good wires on those and put heat shrink tubing on them. Number # looks like that plugs into the R/R with the 3 yellow wires that I see in the plug. The other #3 looks like that plugs into the ENRICHER.
That CDI looks like it has a broken 2 plug connector I think you should get a new CDI and fix the wireing and you should be ok.

The first picture with the two wires going into the crankcase I think it's for oil temp, I would follow those wires back and see where they hook up to.
Alleyoop

[roketa250]

Most importantly where do I get a oil temp replacement? Is it 100% necessary? If it has to stay I was just gonna use some black ATV Silicone to keep it sealed better. Pics to follow with the wiring re-done and much to my amazement there were some wires not even going to each other. Someone had a white going to green, Or I think it was green to black. How did this thing even run at all? One things for sure until I starting grabbing the wires and leaned up against the rectifier they were very hot. The rec was hot to touch! Even the fuse was starting to melt.... It didn't pop yet in the middle it had tiny bubbles in the plastic and it was warm..... This dream of riding a scooter is turning into a nightmare.

[Bashan]

If the engine is vertical it is a clone of the Honda engine. If it is horizontal it is a clone of the Yamaha. The rest of the bike is very similar with some variation of parts but most of the parts are interchangeable. If you took a Jonway apart it would look essentially like a Roketa. We had a guy on the forum order one with the vertical engine and they sent him one with the horizontal because that's what they were trying to get rid of. He ended up keeping it and was happy with it, he didn't even notice for a while!. Don't give up on your scooter yet. Once you work through the issues and get everything like it should be you'll enjoy it. Hey, some bozo rewired it, you can't blame the scooter for that. Chin up bud, it'll be OK, you're in good hands with Alley. Rich

[Alleyoop]

Yes use ATV to seal it by the wires and rubber plug.
Alleyoop

[roketa250]

Thanks Bashan that's encouraging! I haven't thrown in the towel yet. At the very most I would just keep throwing parts at it if I didn't know what to do.... But with everyone here helping... Especially alley! I know I can do this! The air box arrives tomorrow and just by the way it's acting I know a lot of it is the air box... But something has got me thinking that I might have a couple of other issues that are fuel related. Once I get it lined out I intend to upgrade the fuel lines so I can see what's going on and maybe before so. It is very hard to get going in the morning when it's cold and I'm lead to believe either too much air or not enough fuel. It deff takes some time to get it started and then let it warm up before I can start to mess with the A/F mix screw and that also makes me think that the way she's running/starting maybe lack of fuel delivery! I'll update you on my progress tomorrow and what the air box does for me. Thanks again!

[roketa250]

alley..... Tell me what you think about this? I thought I might have a problem on my hands when the air cleaner arrived today. It wouldn't fit as you can see in the pictures... I scratched my head   in curiosity as to which way it went... And then it hit me when I was searching on the Google and found a pic of how it should be. It was then that I realized the extra extension that was coming off of the intake shouldn't be there. So once I pulled that off everything else fell into place. Also my neighbor helped me clean up the wiring. All in all making progress. Next thing tomorrow is crank her up... let her get up to temp and start trying to make adjustments on the A/F screw and hopefully I can get this thing lined out. I've got a new fuel pump on it's way as well for good measure. Something is got me going in the direction of my fuel flow aka fuel pump and the enricher either not working or not turning off.

[roketa250]

Moving right along. Since I've attached the air filter correctly and I'm starting the scooter and letting it warm up to temp then I'm starting to adjust the A/F screw and I know this. Starting at the factory default of all the way in and 2 1/2 turns out.... The scooter wants to bog down... So I gradually adjust the screw out a 1/4 of a turn and by the time I've reached several turns out the scooter bogs down even worse to the point of dyeing out. What does this mean?

[Bashan]

Bogging is usually too much air. You don't have any open lines running to the intake do you. Or any open or leaking vac lines? Is the intake manifold OK? Let it bog for a bit and then pull the plug and see what it looks like. Also, if running the A/F out makes it worse, try running it in, it's worth a try. By the way, I've used just that extension on some projects. It is a plumbing reducer from Lowes. It works OK on the intake side but post carb is not doable, it can't handle gas. Rich

[roketa250]

I'm going to go back over all of my lines just to make sure there isn't any leaks.... I've tried going all the way into the carb with the A/F screw till it can't turn anymore and it still bogs. Something kept telling me it was fuel realted...? Thanks for the point in the direction of the 'too much air!'

[Bashan]

Well it probably is fuel related in that it's too much air/fuel. One thing that can happen is there's not enough vacuum to lift the needle and so when you hit the throttle you get a rush of air but the needle doesn't lift so bluh..... Also, seemingly counterintuitive to what I just said, a plugged pilot jet can cause bogging. But it's the same thing....too much air and not enough gas....bluh..... Try closing off the air some, even your hand, and see what it does. I also had a COIL cause just those symptoms once. As soon as it reached a certain RPM the spark would cut. I chased fuel problems for a week. That's when I learned to take a carb apart and put it back together in my sleep. You do something 400 times and your hands just do it while you're trying to figure out what you missed. I took everything apart and accidentally grabbed a different coil when I put it back together. Boom, it fired up and ran perfect. I said "what's different? Oh.....the freakin' coil!" That's why this icon was made: . It was Miller time.  Rich

[roketa250]

Hear you on that one.... While I was just in the garage making sure there wasn't any air leaks I decided to take the intake off and check it just to make sure. Well..... you know how you try one things and it leads to another while this genius was putting it back together I tightened a bolt too tight and boom! It broke in half in the case. Now I've got to go out and get me a set of E-Z out or screw extractors. Never used them before but watched a youtube video just now. I have a new fuel pump coming Tue for good measure. Can't hurt? And once I get everything back together and I know the carb is clean as a whistle! I'll be getting me a new coil if it continues to act like this! Also tell me what you think. The old CDI box on this bike which appears to be original and scratched up will cut the engine out if I wiggle the plug wires that connect to it! It would seem like I have a lot of variables in play here..... Just giving you what is questionable to me? All I can do is one thing at a time. I have to continue to throw parts at it but I just want to get the darn thing running!

[Alleyoop]

All open things going to the airbox or carb is extra air.