Scooter dies at high throttle angle

[jer]

Used bike starts great (in the cold, supposedly on choke) and takes right off.  After revving to shift point, about 50 feet maybe more, it dies rather than shift, it just dies.  If I let off the throttle, it will continue on.  I searched for a similar problem and only found a bloated topic that seemed to morph from issue to issue.

I'm only looking for a tip, I don't expect y'all to solve my problem.  Is it really a spark problem, like it seems?  Could it be a fuel problem disguised to look like spark?  This is my first foray into scooters, I've been a moped man until now, so I'm familiar with 2-stroke.

Thanks all...

[190mech]

I would look into the carb,seems like the main jet may have some trash in it,,a good cleaning of the entire carb might correct the problem..

[jer]

Well thanks, I can certainly handle that. By the way it sounds, I thot it was some spark problem. This is my first scooter that starts, so I'm easily fooled, I guess. I've been running mopeds with a bit of success. I just picked it up yesterday and don't know much about it. I'm amazed at how many scoots/mopes are for sale that the owner knows nothing about.

This scoot says Moskito on the body. Is there a good spotter's guide to identifying this brand? Or a manufacturer's site?

Thanks again

[190mech]

That would be a CPI brand,its a better quality Taiwan scoot..Lots of mods out there for it,one of my favorites to grind on!!

[jer]

Yeah, I ran that free VIN decoder that is listed here somewhere. It said it was made in Taiwan, which is a much better reputed manufacturing base than China. I wanted to remove the carb to have a look, but the lighting in the new repair bay is so inadequate that I need to repair it before I start any bike repairs. I couldn't even see how to pop the seat, assuming it is mounted on a hinge. I have lots of old 4ft fluorescent fixtures laying around for just this purpose...rip the guts out and wire line voltage directly to one of the pin-bases and stick an LED in.

[190mech]

A key lock on the left rear of seat is the release..

[jer]

Dec 22, 2018 20:21:45 GMT -5 190mech said:

I would look into the carb,seems like the main jet may have some trash in it,,a good cleaning of the entire carb might correct the problem..

Yeah, good tip.  Looking thru the main jet I could only see a pinhole of light.  I took a long cactus-needle and poked it thru.  The hole was obviously larger when I was finished.  I also changed the filter to be thorough.

Thanks

[pinkscoot]

Excellent work. Add cactus needle to the list of things to use to clean jets. No cactus in the wild here but maybe it's time to start cultivating one. You could probably find one for every jet size.

[jer]

Jan 9, 2019 10:34:15 GMT -5 pinkscoot said:

Excellent work. Add cactus needle to the list of things to use to clean jets. No cactus in the wild here but maybe it's time to start cultivating one. You could probably find one for every jet size.

You would only need one cactus.  If you select one with thick needles, you wouldn't need any others because, as you should know, the needles are very sharp so they will fit into the smallest jet sizes.  Once they are in, they will deform slightly to match the gauge.  From there you just twist it back and forth a few times to force out the gunk.  For good measure, I inserted the needle from the opposite end and repeated the procedure.

I have plenty of cactus needles to go 'round if you really want one, just let me know.

But seriously, I was genuinely surprised at the amount of gunk built up inside the jet's orifice.

And as long as we're on the subject of jets, I'm wondering if anyone drills jets for thrift (of money, as well as, material?)

[aeroxbud]

Jan 11, 2019 10:10:58 GMT -5 jer said:

Jan 9, 2019 10:34:15 GMT -5 pinkscoot said:

Excellent work. Add cactus needle to the list of things to use to clean jets. No cactus in the wild here but maybe it's time to start cultivating one. You could probably find one for every jet size.

You would only need one cactus.  If you select one with thick needles, you wouldn't need any others because, as you should know, the needles are very sharp so they will fit into the smallest jet sizes.  Once they are in, they will deform slightly to match the gauge.  From there you just twist it back and forth a few times to force out the gunk.  For good measure, I inserted the needle from the opposite end and repeated the procedure.

I have plenty of cactus needles to go 'round if you really want one, just let me know.

But seriously, I was genuinely surprised at the amount of gunk built up inside the jet's orifice.

And as long as we're on the subject of jets, I'm wondering if anyone drills jets for thrift (of money, as well as, material?)

Brent did a guide on drill sizes vs jet sizes www.49ccscoot.com/printdrillsize.html some people do drill them. But more use a drill as a check to make sure the jet is what it says it is . There is always going to be a bit of error when drilling.

[repherence2]

If you can find a hobby micro drill set, I'm sure you'd be able to do it. I found my micro drill set at an R/C hobby shop. There are conversion tables on the net that correlate the # drill size to a jet size.
When I first got into tuning, I would buy individual jets, one at a time, from a local shop and test it. After buying my 3rd individual jet, I went back and bought a jet that was smaller than the stock size, and that became the jet that I would drill,then test. If the jet bogged during testing, I would remove it and drill it to next drill size up, and so on. When I finally got the carb tune good, I checked the jet/drill chart to find out # jet size and went back to the scoot shop to purchase that specific jet.

[pinkscoot]

I have had a few 35 pilot jets that were clogged beyond repair and just replaced them. Problem solved.