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Laszlo
PostPosted: Thu Sep 15, 2005 6:53 am  Reply with quote
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Joined: 15 Sep 2005
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HELP!
I have an Aprilia Mojito Custom 50, and recently am having some troubles. It'll start, but will only run for maybe 2-5 seconds then die. I'll then try to restart it, but all it does is turn over, and not fire. I've done some derestrictions to it, but didnt change the jet, just adjusted it. Could that be the issue? or something else?
I'm stumped!

Any advice?

Thanks!
-Laszlo
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morgan
PostPosted: Thu Sep 15, 2005 7:47 am  Reply with quote
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what did you "adjust"?
that's probably it...


Last edited by morgan on Thu Sep 15, 2005 7:55 am; edited 2 times in total
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Laszlo
PostPosted: Thu Sep 15, 2005 7:48 am  Reply with quote
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the jet
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Matty
PostPosted: Thu Sep 15, 2005 7:53 am  Reply with quote
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Jets themselves aren't usually adjustable, do you mean something else? Idle or air mixture screw?

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morgan
PostPosted: Thu Sep 15, 2005 7:53 am  Reply with quote
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i'm not familiar with the aparilla 50 engine exactly, but if you adjusted the idle mixture screw, that's likely the problem.

have you checked the plug yet? the color of the plug will tell you if your mixture is too lean or too rich.
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Laszlo
PostPosted: Thu Sep 15, 2005 8:05 am  Reply with quote
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I adjust...something...on the carb. For lack of a technical term, I'll call them the "small screw thingy" My carb has 2 "screw thingies", I'm guessing one is the idle adjust...not sure.

I did the adjusting a while back and it ran fine. The problem just recently happened.

I havent checked the plug, that was my next guess.
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Brad
PostPosted: Thu Sep 15, 2005 8:51 am  Reply with quote
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My Bajaj has two screw thingies. The one with the spring under it is the idle adjustment, the inset screw is for air/fuel mixture.

Is your air/fuel mix turned all the way in? If it is you might not be getting enough air and the scoot won't run (that's been my limited experience anyhow).

The advice is free, take it for what it's worth : )

Brad

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morgan
PostPosted: Thu Sep 15, 2005 9:04 am  Reply with quote
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there should be a set number of turns out from closed that the air/fuel mix screw should be to run correctly. on old vespas it's 1 1/2 to 2 turns out or something like that.

i don't know about your engine, but i'm sure there's a similar setting.

in general, don't "adjust" things unless you really know what your adjusting, why and how to do it.

find out how many turns out it should be for that engine (someone here might know), and then set it there. see if it runs ok, if it does, don't touch it. if it doesn't run ok, tweek the mixture screw with small, 1/4 turns to get the (warmed up!) engine running pretty smooth (you may have to tweek the idle a bit, but try to get the mixture right first). but you should be within the proper range of "turns out from closed" for your engine! if it's not, there's something else wrong.

you can learn to read your plug color (black/oily=too rich, white/dry=too lean, basically) to help you figure out what's going on in the engine.

good luck


Last edited by morgan on Thu Sep 15, 2005 9:12 am; edited 2 times in total
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morgan
PostPosted: Thu Sep 15, 2005 9:11 am  Reply with quote
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i just edited my post there for clarity...

i never edit before i post...
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Brad
PostPosted: Thu Sep 15, 2005 9:52 am  Reply with quote
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morgan wrote:
there should be a set number of turns out from closed that the air/fuel mix screw should be to run correctly. on old vespas it's 1 1/2 to 2 turns out or something like that.

i don't know about your engine, but i'm sure there's a similar setting.

in general, don't "adjust" things unless you really know what your adjusting, why and how to do it.



That's similar to my Bajaj. They say 1-2 turns out, but most dealers seem to set it at 1 1/4 ish out.

I'd be a concerned about the jetting if you've derestricted it. Usually the carb has to upjetted a little if it is derestricted or if you add a pipe, otherwise the engine runs lean (you're pushing more air through). The screw on the carb is just for the fine adjustment.

They run really well lean, at least until the engine seizes This I know from experience, because I compulsively screw with everything I own.

There is a manual posted for it on the Aprilia site, at http://www.serviceaprilia.com/public/lum/index.asp?l=Mojito%2050-125-150

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nate
PostPosted: Thu Sep 15, 2005 10:30 am  Reply with quote
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If I were going to take a completely unedumucated stab as to what was going on, I'd say that you've got sediment in your carb, and the auto-choke is screwed up. Cleaning the carb would probalby go a long way. However, I think it's usually kind of a pain in the ass to pull carbs on the new bikes, at least from what I've seen. Much less disassemble them once they're out, and then put them back together correctly.
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My Pal Foot Foot
PostPosted: Thu Sep 15, 2005 5:15 pm  Reply with quote
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Clean idle jet in the float bowl.
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