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Post by wildwildip on Nov 22, 2014 15:29:59 GMT -5
Hey guys, to my knowledge this is the same scooter as a United Motors xpeed 50, ventro Triton R4, ect. If thats the case, this tech manual should be correct for my scooters jets right? www.49ccscoot.com/manuals/Vento_Triton_R4_Service_Manual.pdfits from our tech section. www.49ccscoot.com/manuals/manuals.htmlLooking at the manual I should have a main jet of #80 and an pilot jet of 57.5. The scooter has never run well, never could idle. I opened the carb and the main jet is 70 and the pilot is 22.5. Should I change both of them up to what the manual says? Scooter is stock, just has never run or idled very well. |
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Post by 90GTVert on Nov 22, 2014 15:36:02 GMT -5
 to the forum. Standard main jet size is 70-80 and pilots are usually 17.5-22.5 from what I've seen, but there are variations. Have you tried adjusting the idle mixture and speed settings? |
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Post by 90GTVert on Nov 22, 2014 15:38:27 GMT -5
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Post by niz76 on Nov 22, 2014 15:45:06 GMT -5
Welcome! With that jet check to make sure you have the snorkel in your airbox. If it isn't in there, it'll (more than likely) be letting in too much air for the 70 jet... I've had good luck running the stock 2t's with 70 jet and snorkel in, but everyone's setup is different!  |
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Post by wildwildip on Nov 22, 2014 23:15:31 GMT -5
Hey guys.
I have seen that video before and yes made many adjustments, but they never changed anything.
I also do still have the snorkel installed.
So after this attempt I removed and cleaned the pilot jet really well. It made a difference as the scooter can now idle well. I also adjusted the air idle jet to match.
Oddly enough after a test drive the scooter died after 20 seconds or so at full throttle. I then waited 60 seconds, kick started it, and it fired right up.
Then after 20 seconds at maybe 30-40 MPH, it died AGAIN. And again, started after sitting for 20 seconds or so. Is this a fuel starvation issue? I just put a brand new fuel lines, fuel filter and petcock assembly on, so hopefully its not. But still, I am not sure what this new, issue could be.
Thanks in advance.
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Post by niz76 on Nov 22, 2014 23:29:10 GMT -5
Hopefully you're not experiencing soft seizes! I would definitely try out some bigger jets and while you're in the carb make sure the float is horizontal while holding the carb upside down like this:  |
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Post by wildwildip on Nov 22, 2014 23:50:44 GMT -5
I dont think its a soft seize. I removed the oil pump and run 25:1 premix. I also THINK the motor is spinning while the scooter slows (during the stall). Plus it kicks over just fine right after.
As for the float, what do you think, not enough fuel? Its not set right?
To answer your question. No, the float (as your photo shows) is actually lower (so higher when the carb is up right) than in that photo. The carb doesn't sit parallel when held that way. I am not sure how to adjust it.
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Post by niz76 on Nov 23, 2014 0:55:57 GMT -5
I dont think its a soft seize. I removed the oil pump and run 25:1 premix. I also THINK the motor is spinning while the scooter slows (during the stall). Plus it kicks over just fine right after. As for the float, what do you think, not enough fuel? Its not set right? To answer your question. No, the float (as your photo shows) is actually lower (so higher when the carb is up right) than in that photo. The carb doesn't sit parallel when held that way. I am not sure how to adjust it. 25:1 is way oily- most here premix at 40:1-50:1. I premix at 45:1... |
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Post by 90GTVert on Nov 23, 2014 8:30:29 GMT -5
32-40:1 is the most common range and 50:1 is only for quality synthetics IMO. At 25:1 you're getting a percent or two less fuel in with the same volume going through the jets. I would try upjetting as Niz suggested. The engine doesn't always necessarily seize in the bore for long, but it gets tight from the hot piston expanding. You often get tell tale scoring on 4 corners of the cylinder/piston from this.
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Post by wildwildip on Nov 23, 2014 10:48:24 GMT -5
Would a too small pilot jet be the cause of the WOT for 20 seconds then dieing? While at high speed?
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Post by 90GTVert on Nov 23, 2014 11:37:32 GMT -5
No. For WOT you need to be looking to the main jet or to air leaks.
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Post by wildwildip on Nov 23, 2014 14:21:17 GMT -5
Opps, I meant to say
Would a too small MAIN JET be the cause of the WOT for 20 seconds then dieing?
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Post by 90GTVert on Nov 23, 2014 18:57:19 GMT -5
Quite possibly.
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Post by wildwildip on Nov 27, 2014 19:54:14 GMT -5
Main jet is a 70. Scoot has a 72cc bbk and pipe with some cvt work. What size jets should I pick up?
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Post by niz76 on Nov 27, 2014 23:27:22 GMT -5
Main jet is a 70. Scoot has a 72cc bbk and pipe with some cvt work. What size jets should I pick up? In my experience the 70 main jet is good for stock 49cc and stock exhaust- with that bbk and pipe you are almost surely running too lean! Partsforscooters.com sells a jet kit for only $15 (plus shipping)
Everyone's setup is different. There's a ton of good info on carb tuning in the Tech section! HERE. |
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