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Post by mattdel on Mar 26, 2013 15:13:29 GMT -5
So I've been having an issue with my Roketa that gradually grew from a sometimes hard to start and idle to now, it will start and run great at 3k for a few and then almost exactly 15 seconds later, it will die as if I drained the bowl. If you immediately start feathering and holding high revs after you start it, it will do the exact same thing. 15 or so seconds in, it starves of fuel and dies. Sometimes it's hard to start/restart, sometimes it's not. No matter what though, it will not stay running. Bear in mind, this carb is the new EPA model that has no adjustment screws. (Someone tell me I need a new carb and link me an adjustable version  I'm pretty sure it's gonna end up being related to the main diaphragm up top, leaky or something. I took it all apart, cleaned my jets etc.. Main diaphragm and accelerator pump looked fine, but I'm not all that experienced with these chinese carbs. Any thoughts? |
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Post by teddy554 on Mar 26, 2013 17:05:13 GMT -5
Sounds like you need a valve adjustment more then a new carb, have you tried that yet if not i recommend doing that first before spending any money
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Post by gy6girl on Mar 26, 2013 17:08:37 GMT -5
Have you checked the fuel pump or valve and the fuel filter?
Or just checked to see if the fuel flow is fine?
I'm taking that you have.
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Post by mattdel on Mar 26, 2013 17:59:50 GMT -5
No I haven't checked valves, although that maybe makes sense. I had a faint pop today that sounded like a valve problem.
The fuel system is working as it should. I checked it, then I bypassed it. Same results all around.
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Post by teddy554 on Mar 26, 2013 18:37:46 GMT -5
let me know if you need any how to links
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Post by alleyoop on Mar 26, 2013 18:41:18 GMT -5
When did you her it pop on decel or on throttle?
Alleyoop
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Post by scootercapecod on Mar 26, 2013 19:09:39 GMT -5
These new EPA carbs are garbage at best. I had one on my peacesports Dash 150 and after I took off the EGR crap, it ran like junk also After I bought a new standard CVK type carb with adjustments and was able to up-jet the main, my ride is a lot better. I still have some small work to do, like reduce the roller weights just a bit and maybe a new contra spring. As it sits right now I am seeing high 60's for speeds on flats, downhill I havent bothered to look but I would think around 70.
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Post by mattdel on Mar 26, 2013 19:30:21 GMT -5
let me know if you need any how to links If you happen to have any, that'd be sweet. I'll take care of it tomorrow, gonna be nice out. |
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Post by teddy554 on Mar 26, 2013 20:24:33 GMT -5
The second video is probably the best one but i want to post some with the motor on the scooter
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Post by mattdel on Mar 27, 2013 18:10:47 GMT -5
Update: works! The intake was at less than .001 and the exhaust was closed tight. Set them both to .004 and we're off to the races! Best it's ever ran! Thanks ;D
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Post by rockynv on Mar 27, 2013 22:29:15 GMT -5
Now just remember to add a monthly fuel system cleaner to you routine and keep up with the valve adjustments. I use Lucas for regular maintenance and Berryman's Total Fuel System cleaner for remidiation.
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..BAD TO THE BONE..