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Post by JoeyBee on Nov 14, 2015 11:03:23 GMT -5
Updated on top.
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Magneto
by: JoeyBee - Nov 11, 2015 18:41:05 GMT -5
via mobile
Post by JoeyBee on Nov 11, 2015 18:41:05 GMT -5
Do you know how many poles your stator has now?
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veterans
by: JoeyBee - Nov 11, 2015 13:18:39 GMT -5
Post by JoeyBee on Nov 11, 2015 13:18:39 GMT -5
Awesome thread cyborg. +1 bone |
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Post by JoeyBee on Nov 10, 2015 15:33:53 GMT -5
lain. Nice observation with the air fuel mixture screw. I didn't even notice that when I first viewed the picture. Looks like OP answered his own question.
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Post by JoeyBee on Nov 9, 2015 11:55:13 GMT -5
Go with Scrappy Dog Scooters. Their standard 150cc carburetor is well worth it. The jets are accessible, and the needle is adjustable. I'm assuming you have a 157QMJ engine. Thanks for the reply! Yes, you assumed correctly, I have the 157QMJ engine. Do you have any personal experience with one of the carbs from Scrappy Dog? I have ordered parts from them in the past and have never had any issues with their parts, but it would be great to hear some first hand experience with this particular part. I also saw that they have a 26mm carb available too... Thats the first I've seen a carb that size listed, although I've seen the 30mm ones before. Any thoughts in that? Just curious... Thanks again! Go with the standard stock model. Unless you have done some serious engine modifications, the stock with proper tuning is exactly what you need. |
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Post by JoeyBee on Nov 6, 2015 19:32:18 GMT -5
Just go to scrappy dogs main page. And it will be under 157QMJ common parts.
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Post by JoeyBee on Nov 6, 2015 12:03:53 GMT -5
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Post by JoeyBee on Nov 5, 2015 19:37:30 GMT -5
I'm happy to hear you are okay. That would have been a very nasty spill.
Did the fix to the engine hanger hold up this time?
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Post by JoeyBee on Nov 4, 2015 21:07:25 GMT -5
Well when you use a larger carb you also allow a larger band of air to enter which may be ratio-wise the same as the old carb but in quantity there is more gas to explode and more air to use to explode the gas which in turn creates more torque. Bigger more forceful explosions happening in the combustion chamber will force the piston away from the chamber with much more power, of course there is always a limit to how much particles you can fit in there. If you can figure out how to put more in there than physically possible your next project will most likely be a Tardis, lol. That was the same line of thinking I had. But larger carbs have been a hotly debated topic here, so I statistically wanted to confirm or denie it. As for a Tardis, I will leave that to manic doctors. |
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Post by JoeyBee on Nov 4, 2015 18:54:00 GMT -5
Yes, stock 157QMJ engine. And fine tuning will include everything from air:fuel screw, adjustable needle, to jets.
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Post by JoeyBee on Nov 4, 2015 15:21:44 GMT -5
The results of testing the larger 30mm carburetor on a stock 150cc engine (157QMJ) are done. I am very disappointed from the lack of performance gains and the very noticeable increase in fuel consumption. Clearly as ricardoguitars pointed out, without upgrading the engine the increased amount of inputted fuel is just being wasted. With the help of my wideband air/fuel sensor I was able to tune the 30mm to perform almost as my stock carburetor. I say almost because the 30mm did not have an adjustable needle. But after adjusting the mixture screw and swapping the main and pilot jets, I was able to get it to maintain near a 13.5 air:fuel ratio until WOT then drop to 12.8ish. After getting the tunes to match for both carburetors I ran some tests to see if I gained any speed. The quarter mile runs were .5-1.0 seconds slower, and WOT runs were several miles per hour slower. [Quarter Mile Runs]  [WOT Runs]  |
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Ad Free
by: JoeyBee - Nov 1, 2015 14:11:32 GMT -5
via mobile
Post by JoeyBee on Nov 1, 2015 14:11:32 GMT -5
Count me in. With all the help and technical advice I received from here, a donation to keep this forum ad free is the least I can do.
With all the members we have, I think we can easily raise another year of ad free fellowship.
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Post by JoeyBee on Oct 24, 2015 17:26:32 GMT -5
Have you thought about a 150cc? A lot of people grow out of a 50cc pretty quickly.
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Post by JoeyBee on Oct 23, 2015 9:38:22 GMT -5
How is your battery? Are you sure it is holding a charge?
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Post by JoeyBee on Oct 22, 2015 9:42:36 GMT -5
How does the spark plug look? Is it black? Sounds like a tuning problem. What is the needle in your carburetor set at?  |
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