MOPED ARMY

Are you running the malossi or polini reeds? Also what pipe.

I have a polini, malossi, racing 21 phbg and a simonini and its running a 100 jet which seems almost right, I might need to step down to a 98 as it seems there is hesitation between 3/4 and WOT.

So you might be running a little rich or you have an air leak somewhere.

david is right about the air leak but totally wrong about the main jet. as you can see in the diagram below.... the main jet starts functionality about 1/3 of the way through but doesnt become truly effective till 1/2 throttle. if you are having issues at 1/3 throttle the best thing you can do is to adjust the needle setting. "lowering the needle" by "raising" the clip up one position makes the the gas flow leaner in the low to mid throttle range. its tapered so when the needle is 1/4 to 3/4 of the way out, the angle of taper is what determines how much gas can escape through your mainjet. Once you reach WOT the amount of gas is completely controlled by the main jet. actually there is one other element to the equation. the air/mixture screw. look at the chart see how it is moderately effective all the way through? that is because it uses a separate jet which also sucks fuel that doesnt have a needle. the adjustable screw thats flush with the carb body controls it. by turning that counterclockwise you will let a minute amount of more gas flow in to the system, by tightening it you will cut that off. so you can make minute adjustments by using the screw or major ones by changing the jet.

wow, i've never typed that all out at once, shits crazy.

who cares how it runs it 1/3 throttle. Who uses that. WOT all the time!

;)

sorry posted pic in wrong thread

down jet more!

I ran mine with an estoril and a 100 jet, and only really started to hit the top end well when we were riding back from the city and it was in the upper 30s (leaned it out). Don't be afraid to get it tuned right and make it rip. Way too rich is lame, a little rich is better.

if you want to know the dell'Ortho carby inside out then its time to do some reading of the manuals. if you dont have them then get them here

http://www.thisoldtractor.com/gtbender/dellorto.htm

but you need a pdf thing and better then dialup or beleive me it will take all evening to download the manuals.

..drop the main jet first, then once you get to the correct main jet for WOT, you may or may not need to adjust the needle if there are still problems around mid throttle.

oh one more q (and yes I know it's a stupid girlie question, but I'm so new to this)...

there are 4 needle settings: if you are at the lowest setting (needle high), does it mean you are lean? (less mixture flows up?) and if the needle is set to the highest notch, then you are rich? is that correct? just double checking...

lowest setting = little fuel = lean?

isn't that exactly what i said? why the opposite?

(by lowest setting I mean the lowest notch) man, I am confused.

Does anyone know which brass fitting on the 19mm race model is for the oil injection hose. It has 2 small ones, one on the top of the spout that goes in the intake and one on the side of the carb body. Thanks

I'm going to piggyback onto monica's thread since we're trying to do the same thing. I just bought a maxi with the 80cc airsal kit, dellorto phbg 21mm race carb, k&n filter, and am trying to get it running correctly (I'm new to mopeds). it came from a totally different altitude/climate (OR) compared to where I am at in SF so I think everything is out of whack.

right now it has an 85 main jet and a w7 needle set at the top clip point. it seems to run really rich all over, but being new to mopeds I don't have anything to compare it with feeling wise. I pulled the plug (just after rev'ing it in the garage) and the electrode looked decent but the threads of the plug were wet and oily.

does anyone know what jet I should start with? is the w7 the stock needle that comes with the carb? I also have a w9 and some assorted jets to play with if I knew what the rough starting point should be.

I stepped down to a 38 idle jet (from a 40), set the w7 needle on the 2nd clip point from the top, and played with the idle mixture and speed screws. it idles pretty well now and seems more peppy up to 1/4 throttle or so. as soon as I give it some juice though it completely bogs down and will even stall. any ideas? I spoke with treats and they thought the 85 main jet would be perfect for this setup.

yeah I guess that's why I am confused, since monica and I live in the same city and she is running 106. I don't know, treats said 85 was spot on. I'll try going to a bigger main jet for the heck of it and see what happens. how do I test for an air leak?

I put a 95 in today and it didn't seem much better. if I had an air leak, wouldn't the motor keep running if I screwed the mixture adjustment all the way tight? I did this, and the motor dies, as it should. the bike seems to rev up fine on the kickstand but as soon as I try and ride it's slow with no power and will bog and die out if I gun it. ideas?