ratdog
Scoot Enthusiast
Posts: 342
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Post by ratdog on Aug 21, 2018 18:38:12 GMT -5
If you use anything but the correct belt, you limit your speed range. With a normal belt, you should be able to get your front pull all the way to the outside, while the rear pull gets as small as it can. With a shorter belt, the front pulls might get to say 90% of it largest size before the back pulls “bottoms out” at its smallest. In effect you are limiting your top speed. If you were going say 35 with the normal belt, you might be limited to say 30-32 with the short belt. Of course on scoots that never produce enough power to fully expand the front pull there would be a lesser effect
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Post by katt on Aug 30, 2018 22:57:43 GMT -5
Tired of getting owned by dudes with 150cc man no matter how much money i spent on the crappy QMB139 it will only lower reliability and still going to suck compared to any stock 150cc, i am putting a cap on spending on this piece of junk, it cannot even get to 40mph without investing like fortune into it.
i put 50mm BBK and it rides virtually the same compared to 47mm bbk i had from factory, now to uncover full potential i need new carb and exhaust and also spend like $50 on variator and weights just so it gets 10% faster if any.
Then when i throw it away and buy 150cc i will end up needing all new parts again because none of them are compatible.
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ratdog
Scoot Enthusiast
Posts: 342
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Post by ratdog on Aug 31, 2018 7:21:24 GMT -5
The carb has nothing to do really with the switch from 47mm to 50mm. to get full potential out of the 47mm engine it should have had a bigger carb.
i very much doubt that spending the $$ on a different exhaust will be cost effective. an aftermarket exhaust will look better, and god knows it will be lighter, but I doubt you will get "10%" more power.
The whole point of getting a 150 is so you don't NEED all those "Parts" the 150 in 100% stock condition will give you the extra speed you want
I don't understand why you think you need a different variator. what you do need, it appears, is the CORRECT belt for the bike. Just personal basis, I'd recommend the Erlandson 669 drive belt. the only reason to change the weights would be to change the RPMs that you are running WHEN YOU ACCELERATE. the weights effect you from, lets say 5 mph to the mid thirties. If when you go to WOT taking off, and your RPMs sore over 8000, you would most likely benefit from heavier weights. If you gas it and the RPMs only jump up to 6000, then you would benefit from lighter weights. If you take off and the RPMs stay at around 7500 up into the 30s, you have the "right" weight now.
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Post by katt on Aug 31, 2018 16:12:36 GMT -5
That piece of junk only goes 35mph with 50mm kit what the heck.
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ratdog
Scoot Enthusiast
Posts: 342
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Post by ratdog on Aug 31, 2018 20:43:50 GMT -5
Well dump it and get a 150 then
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Post by katt on Sept 1, 2018 0:44:57 GMT -5
Lol I will as soon as i run trough the list of possible problems if nothing helps i will do just that.
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Post by katt on Oct 30, 2018 13:28:33 GMT -5
Drove 10 miles up the hill mostly small hills and big ones and it made me understand that my scooter is totally useless piece of junk.
82cc was not enough it was dragging 20mph and felt like its going to fall apart from all the extra load.
Plus all this going up hill for miles and miles added extra load to engine and made it overheat badly i know it was running rich, yet oil temperature still grow to 100* C.
Yeah its drives good any road that goes even slightly down hill, acceptable on flat roads, but it can hardly maintain speed going up the hill.
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Post by diynuke on Oct 30, 2018 15:16:27 GMT -5
I think you are kind of overrating the power of an qmb139. you are probably running about 4.5hp and that's it on a light bike it would be plenty but on an heavy scoot with big wheels it just isn't that much power. and well with hills... even cars struggle with hills..
I would say just keep it as it is or just put the 47mm back on and the 18mm carb and make it running right and just save for a good bike. not some cheap ass Chinese one. which you will throw more money at in the long run than a good brand scoot.
I can go 44mph with just an 47mm bbk and a new jet. (and an non rev limited cdi) nothing special.
after putting an foam filter and porting the head a bit I was able to get 46mph out of it
and don't pay too much attention to the temperature. it will run hotter than normal. just because of more surface compared to an 47mm cylinder
you could try one of those performance air fans but I think they don't make such a big difference
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Post by katt on Oct 30, 2018 18:18:29 GMT -5
Bro i do have performance fan and 50mm bbk and i can hit 55mph on speedometer realistically probably 42mph or so, but this with a long acceleration imagine i need to accelerate up the hill from stop sight its going to suck ass.
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Post by SMALL CC TEK on Oct 30, 2018 22:24:43 GMT -5
Quit getting owned by 150cc's = TWOSTROKE 72 or more loll
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