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Post by ricardoguitars on Nov 30, 2014 4:49:24 GMT -5
Environmental friendly my gaiters!!, less fuel consumption means less pollution, the whole PCV/Airbox stuff is bullcrap  |
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Post by oldchopperguy on Nov 30, 2014 14:50:16 GMT -5
Ricardoguitars,
I have to agree... I rode a Chinese 150 for 6 years, and found the factory air-box setup with "tuba" intake (at least on my Xingyue) truly WAS total crap. The engine NEVER would run right with it. And, through long, hard experimentation I found my engine would ONLY run and tune properly either with NO air-filter (definitely NOT recommended) OR, with a UNI "sock" filter attached DIRECTLY to the carb-mouth. Even a short extension between the carb and filter degraded performance in a MAJOR way. Just an extension of any kind WITHOUT a filter caused the same irritating phenomenon!
But, using a UNI filter, the engine could be tuned to run perfectly. No way to explain that... Just the way it is with some Chinese GY6's. Leaner, cleaner, and running RIGHT uses less gas, and makes fewer emissions. Yup!
Although, as I understand, even when perfectly-tuned, the air-cooled scooter motors put out emissions somewhat akin to a 1970's 500 cid V8 Cadillac with the choke stuck on anyway...
Ride safe!
Leo in Texas |
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Post by shalomdawg on Nov 30, 2014 16:14:17 GMT -5
howdy, i'm not intending to be facetious or asking with some kind of agenda. does removing the airbox and using the aforementioned sock filter give you any problem with icing of the carburator or water ingestion when it rains?
lotsa miles and smiles to ya
ken
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Freshman Rider
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Post by ccr on Nov 30, 2014 16:57:11 GMT -5
you have to be very careful with dirty rainwater with that kind of setup, its not really about limiting engine performance with the stock box, it's more about making sure your combustion chamber doesn't get destroyed by contaminants.
but it sure does make a difference without it. i wish they would make a forward facing carb scooter engine with a water trapping ram intake and sponge filter.
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Post by oldchopperguy on Dec 1, 2014 0:49:40 GMT -5
howdy, i'm not intending to be facetious or asking with some kind of agenda. does removing the airbox and using the aforementioned sock filter give you any problem with icing of the carburator or water ingestion when it rains? lotsa miles and smiles to ya ken Ken,
Never had a problem with icing of the carb. The air-filter is pretty well centered under the seat-pan, and well-protected at the intake end by the fender, so I never had any real problem with water, either, but it could be a concern if you ride in heavy weather. And keep it away from the spray-wash, for sure!
I rode with the UNI for over five years with no trouble, except that it would wear badly from the "cat-back" engine mount over it. I just replaced filters every two years as they'd get beat up.
I had GOOD service with them, so I can recommend them.
Hope this helps,
Leo
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Post by oldchopperguy on Dec 1, 2014 1:01:30 GMT -5
you have to be very careful with dirty rainwater with that kind of setup, its not really about limiting engine performance with the stock box, it's more about making sure your combustion chamber doesn't get destroyed by contaminants. but it sure does make a difference without it. i wish they would make a forward facing carb scooter engine with a water trapping ram intake and sponge filter. Agreed, and I was watchful, but I seldom ride in rain. The few times I did, the filter was "buried" enough that it didn't even get wet. I suppose it depends greatly on the individual scooter setup.
And, absolutely and positively AMEN to the forward-facing carb!!! Had I kept the 150, THAT would have been my next mod! It's NOT difficult to accomplish. Lots of "Skelly" or "Nekkid" scoots use them. With a regular street 150 with plastics, I'm sure the intake manifold could be modded to face the carb forward, and the carb could protrude through the front plastic, under the nose of the seat. THAT would allow EASY access to the carb, and EASY experimentation with the air-filter. (A longer intake run which sort of goes with the forward configuration anyway, seems to enhance performance too.)
With all the front "mud-guard" plastic dash/floorboardd on these scoots, I've never even gotten my ankles wet, so the carb would be pretty safe "knuckles-in-the-wind" style. And it would LOOK mighty neat, too!
Yes, if I ever go back to a GY6 150 type, a forward-facing carb is a must! However, I'm SO happy with my tired, well-worn and beat-up "new" old '07 Kymco 250 (old "Minnie Mouse is as reliable as the family car, on 2-wheels...) that it's unlikely I'll ever downsize... Maybe I just might upsize a few cc's one day though!
Sincerely,
Leo
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Post by shalomdawg on Dec 1, 2014 2:04:11 GMT -5
howdy leo, yup i've been really pleased with my bv350 which has seen  mph on the speedometer and still gets 60 mpg everywhere i go. it would be i think, the best upgrade for the money if you can spare it. mine has better than 15,000 on it now in a little less than 2 years. the reason i'm so conscious of icing is that i did extensive mods on a datsun 510 motor with porting and polishing and matching and everything i could think of to do but in doing that i lost the carb heat system and it would ice up and quit running when conditions got just right. i'd just have to pull over and let it melt then buzz on down the road. nice sounding motor when i got done. lotsa miles and smiles to ya ken |
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mph on the speedometer and still gets 60 mpg everywhere i go. it would be i think, the best upgrade for the money if you can spare it. mine has better than 15,000 on it now in a little less than 2 years. the reason i'm so conscious of icing is that i did extensive mods on a datsun 510 motor with porting and polishing and matching and everything i could think of to do but in doing that i lost the carb heat system and it would ice up and quit running when conditions got just right. i'd just have to pull over and let it melt then buzz on down the road. nice sounding motor when i got done.