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Scooters - 50cc => Agility 50 => Topic started by: biggazmo on July 09, 2012, 08:20:14 PM
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57 reg ag50 , cdi cut , smooth boss , 102.5 main jet , k+n filter , 5.5 rollers , new exhaust = poo uphill and slow acceleration !
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What pipe is it. Your main jet seems a little big in my humble opinion. Try a 95.
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Its a sports pipe . no brand really but sounds good . went from stock 82jet to 85 , advised locally on a102.5 ?
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Sounds like your jet is way too big
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Sounds like your jet is way too big
Yup too rich prob. Check the plug and i bet its all black and sooty.
Depending how black it is ypu will have to judge how much to rejet down which means buying a selection of jets and plugs and going thro them till it runs well and the plug reads good.
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I have ordered a 1500 torque spring and a selection of clutch springs . ill buy a 95 main jet tomorrow .
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advised locally on a102.5 ?
It's crazy how much jet sizes can differ too. Anytime someone standardizes the jet size with a certain setup I can almost guarantee it won't be right, aside from the de-restricting.
When I bought an 85cc kit from Scootertronics they said a 95 jet was what I should use with my specific setup, since then I've installed a 72cc kit instead and I have a 105 that's in right now that's running lean, about to go up to a 110 or higher.
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IMO a set of jets is the way to go...
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Would an oversized jet affect acceleration ?
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I would think it would affect acceleration, top speed and midrange depending on how oversized it was. I know when I had a 95 in with my setup it wouldn't go above 15mph because it was so starved. Seems like the opposite would be possible as well.
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Would an oversized jet affect acceleration ?
Yes if the jetting is not right it will affect acceleration, overall power and uphill speed too.
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Ill try a 95 tomorrow while i wait for clutch springs to tour the globe on way to me
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Im in Glasgow and i reckon ive narowed mine down to a 94-96 after months of trial and error so you may luck out on the 95 jet. No 2 scoots are ever the same tho, too many variables, but you never know it may be there or there abouts.
Have you checked to see how the plug thats in now looks?
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No not checked plug yet . i thought 102.5 was a bit big.......
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No not checked plug yet . i thought 102.5 was a bit big.......
Mine ran with a 102 in it, even ran with a 110 in it too but it was too rich for me and i had the same symptoms you described. Just be sure to keep an eye on the plug once you chamge the jet out, youre going to need a new plug now to be sure since the one you jave in mow will be blackened and you wont be able to get a reading off it now from the new jet.
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Put my 85 jet back in . stock was 80 . Will give it a try if the rain ever stops while i wait the year for my springs to arrive
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Would an oversized jet affect acceleration ?
A few sizes up from the perfect jet (e.g. from 90 to 94 in my case) will change a fast and responsive scoot to a lifeless and boring ride...
But beware : a few sizes down from perfect will change the same scoot into a short lived piston-eater ;D
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Would an oversized jet affect acceleration ?
Absolutely
Work your way down one size at a time. Jumping around can be confusing.
You can run rich for years and do no damage. Run it for a few weeks one or two sizes too small(lean) and oops, there goes the piston.
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Absolutely
Work your way down one size at a time. Jumping around can be confusing.
You can run rich for years and do no damage. Run it for a few weeks one or two sizes too small(lean) and oops, there goes the piston.
Never had a piston go on me, yet, what happens when it goes? Does the engine just seize up and stop?
Hopefully i never experience it, just wondered what the worse case scenario is tho? Is the engine normally repairable with a new piston or not if it does happen?
Got me worried now since im sure i was running lean for a few weeks after i fitted a Leo Vince, upjetted last weekend anyway and all still seems good so im hoping it hasnt done any damage.
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4 strokes are much less sensitive to running lean. The enemy here is heat. 2 strokes need the fuel/oil for cooling as well as lubrication. 4 strokes do too, just not as much. Not matter what condition the fuel mix is, there is always oil pumping through the engine.
Most of the time the rings shatter and score the cylinder and you immediately loose all compression. That's the best case scenario.
What's the worst that can happen?
A chunk of piston falls down into the crankcase and wedges itself somewhere it should never be. The crankcase gets cracked and that's it. The entire engine is done.
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YUP!
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+1 YUP
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Well like i said i think im ok and it seems fine, just wondered.
If the worst case scenario happened i have peoples who can get me a spare low miles stock engine for under £100 so its no biggie.
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Well like i said i think im ok and it seems fine, just wondered.
If the worst case scenario happened i have peoples who can get me a spare low miles stock engine for under £100 so its no biggie.
That's good
I see those A50s all the time