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Post by brandonscoot on Aug 25, 2011 12:52:07 GMT -5
so i got my scrappy doggy doo pipe installed, after HOURS of modification, bending, drilling, and custting. and now i need the jet. does anyone know the details of the jet i should get ex. (muniki full size main jet #87 short style)
not that thats the way its described^^ but i mean like the straight up details of it. i have to get it from this local store and they are real rude so i have to describe what i want to the tee or they just say "we probably dont have it kid, bring us something we can compare to and we might look"
im planning to pull the jet in the parking lot to compare to but id like to know exactly what size range to get.
any suggestions are appriciated! ;D
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Post by 90GTVert on Aug 25, 2011 13:19:11 GMT -5
Mikuni VM11/22 is the style of jet. JetsRUs and Rocky Mountain ATC/MC are good spots if you can't get them at the local place. You'll probably end up 5-10% larger jet size than whatever is stock. So IF it's a 70 main, you'll probably want 72.5, 75, 77.5. I'm always worried I won't have the right one so I'd probably get a few more to be safe. If you want to get a larger selection for the same money you can skip the half sizes and do 75, 80, 85. Again, this is all GUESSING that it's a 70 stock. See what you've got in there.
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Post by brandonscoot on Aug 25, 2011 13:35:45 GMT -5
okay awesome! thats exactly the info i was looking for
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Post by brandonscoot on Aug 25, 2011 15:17:39 GMT -5
oh yeah, one other thing. once i put the jet in and adjust the carb i can start smashing it WOT again right? i heard without the jet it would be "lacking fuel" or something and risk effing the engine up...
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Post by 90GTVert on Aug 25, 2011 15:37:03 GMT -5
Once it's in tune you can ride it however you like.
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Post by brandonscoot on Aug 25, 2011 15:41:58 GMT -5
Once it's in tune you can ride it however you like. thats what she said... :doh: lol |
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Post by 90GTVert on Aug 25, 2011 15:42:34 GMT -5
:lol:
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Post by brandonscoot on Aug 25, 2011 17:26:03 GMT -5
49ccscoot.com/printdrillsize.htmlwell, looks like they didnt have it in stock, all of the ones there were too small of threading to go to my carb, so im a drill it. if my jet is a "70" does that really mean 170? or is 170 just a huge jet? i noticed this list goes up very high 579.12 if my jet is a 70 how could any scooter in the world possibly have a jet that big? thats just a hole. any guidance is appriciated.
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Post by brandonscoot on Aug 25, 2011 17:28:31 GMT -5
BTW anyone who reads this: DONT BUY THE SCRAPPY DOG EXHAUST!!! no joke its really crappy. it took foever to get it even close to fitting my vento. the power increase is real decent and it looks pretty rad but the quality was a serious let down... -1pt for scrappy dogg.  |
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Post by 90GTVert on Aug 25, 2011 17:39:42 GMT -5
70 means 70 (0.70mm). 170 would be huge... wouldn't even start.
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Post by brandonscoot on Aug 25, 2011 17:44:56 GMT -5
okay thankyou again!  |
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bigjeff
Scoot Enthusiast
just scootin
Posts: 294
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Post by bigjeff on Aug 25, 2011 17:48:31 GMT -5
note to self....keep everything stock so it will work correctly...
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Post by brandonscoot on Aug 25, 2011 18:17:46 GMT -5
lol!
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Post by brandonscoot on Aug 27, 2011 16:55:26 GMT -5
ok so stock was 70, right now its out to about 87, is that too big or is it possible to tune it to work with that? im having trouble understanding this: if there is more air, you need a bigger jet, so why not just have as much air as possible then put a huge jet to acomidate that? the 87ish size is running pretty good but in the mid range it bogs alot. im planning to pull the plugs tonight after work and do some color testing too.
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tango
Scoot Enthusiast
Ad agendum semper parati
Posts: 389
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Post by tango on Aug 27, 2011 19:26:22 GMT -5
ok so stock was 70, right now its out to about 87, is that too big or is it possible to tune it to work with that? im having trouble understanding this: if there is more air, you need a bigger jet, so why not just have as much air as possible then put a huge jet to acomidate that? the 87ish size is running pretty good but in the mid range it bogs alot. im planning to pull the plugs tonight after work and do some color testing too. The problem with that is something called a stoichiometric ratio. You can pump as much air as possible, say 15grams, but you would have to put about 1gram of fuel for proper combustion to occur. The small carbs we are using can't supply enough fuel from the bowl for that sort of thing, particularly since we have gravity fed fuel systems. The size of the jet is only part of the story, the rate of flow is another. |
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