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Sly_JAX



Joined: 30 Mar 2008
Posts: 22
Karma: +1

Location: Jacksonville ,FL, USA

PostPosted: Sat Apr 05, 2008 6:22 am    Post subject: Does fuel additive products ..... Reply with quote

Does fuel additive products really help increase your power?

Not in my case.... I`ve used almost everything you can get from your neighborhood part store and/or Gas station ( like octane booster etc etc ...) ...and.... I got to tell you QMB139 run the best on regular 87 octane gas.... testing new products cost me labor time for cleaning my carb from wax and other unknown gelly-like substances.... My scoot used to cruise at 40 mph on flat ( up to 45mph using air drag from Van or Semi in normal traffic{ my weight is only 135lbs - 5`9" } I should fly on that thing). But anyways experimenting with dose "helpful" things made 30 mph top max speed for my scooter.... And still can`t figure it out..where is the F problem...changed oil, fuel filter, cleaned air filter, got pure 87 octane gas, then 87 with 10% ethanol ( thats what they sell at Hess right now , you got no choice...) Well still it is something missing...or maybe 3.654 miles its all what you can get from china engine 139QMB...and I`m chasing a ghost , that died at 2000 miles....

P.S. I have no problem to start it, cold or warm. It will idle smooth...it will accelerate fairly good, but it won`t go faster than 30(35 down hill {not many of them in FL, unless artificial, like bridges , ramps etc}) and there is no spacers, pink wires and other restrictions, IT USED TO GO 40mph+.

P.S. II. Sorry for my English ... I was born in Eastern Europe.... (PL) in states just few years... Wink



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Aerostudent



Joined: 02 Mar 2008
Posts: 147
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Location: SoCal, USA

PostPosted: Sat Apr 05, 2008 7:26 am    Post subject: Reply with quote

I'm sorry, I can't help with your loss of power, but I can say that I use something called "Liquid Nitrous: Octane booster, race additive" and it works nicely. Nothing insane mind you, but it gave a noticeable increase in power and throttle responce. I have a 150cc though , and I don't know if you'll see much of a gain for a 50...

Oh, I just realized, you might want to check your belt and replace it if it is indeed the original. That would probably your loss of top end right there. Also, despite that it may "run better" on 87oct, I would stick with the 91+ as it is recomended for most scooters and you're looking at maybe $0.10/tank difference so maybe $10-$12/year, not a biggie in order to run the right fuel...

Aero



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Sly_JAX



Joined: 30 Mar 2008
Posts: 22
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Location: Jacksonville ,FL, USA

PostPosted: Sat Apr 05, 2008 7:39 am    Post subject: Reply with quote

Well I was thinking about belt.... but I don`t know how to tell if it`s "done" or not .... How do you know, or better how many miles one belt may last?.
In my Owners Manual Book they said 87-90 octane gas will work the Best.



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Sly_JAX



Joined: 30 Mar 2008
Posts: 22
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Location: Jacksonville ,FL, USA

PostPosted: Sat Apr 05, 2008 7:52 am    Post subject: Reply with quote

P.S. one time I have used "106" octane gas ...(custom mix).. it welded my spark plug.... So I`ll stick with 87....
87 Octane gave me best results...
Right now I got no Idea what the F is wrong with my scoot..... Next week I`m going to pay almost half of the new one just to make some cheks and tune ups that are not really tune ups...reg. maints.....



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Yellow Scooter



Joined: 20 Mar 2007
Posts: 7113
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Location: North Carolina USA

PostPosted: Sat Apr 05, 2008 2:06 pm    Post subject: Reply with quote

I have to agree it sounds like a belt failing to me too. From what your saying, everything else seems fine with the motor. It's the only thing left that would make sense.
If theyre harging half the value of your scooter for that, you need to find another place to take it. Or invest in tools and a repair manual. we'll be here of corse too. Wink



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Aerostudent



Joined: 02 Mar 2008
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Location: SoCal, USA

PostPosted: Mon Apr 07, 2008 3:07 am    Post subject: Reply with quote

There is no real cut and dry mileage to tell if a belt is done, but I would look at it for any signs of cracking and in the belt cover for excess belt dust (black rubber dust, nasty stuff, try not to breathe it), also check the edges of the belt and if they look glazed then it is past it's peak performance, even if the rubber is still ok. At said 3600 miles, you are probably ready for a new belt, mine started loosing noticeable performance at about 1700 miles, and some have had them fail as soon as 700-1000 miles. Also, I have no doubt that 106 oct fuel is to hot for a scooter, but 91 would be no problem, try it sometime and see if you/your scooter likes it. Also, it may have been a blessing in discuise for the plug to melt, as the stock plugs are generally crap and break relatively quickly anyway (get an NGK, maybe Iridium).

Yeah, I agree with YS, if a shop is charging you that much, then something is wrong and I would either find a new shop, or learn to wrench it for yourself. I personally wouldn't trust any of the shop around here with it (other than the dealer I purchased it from) and I wrench mine myself for just about everything, it's only been to the dealer once, and that was for a stuck piston, covered under warantee.

Just my $0.02

Aero



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1fixitman



Joined: 19 Jun 2008
Posts: 473
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Location: Augusta, GA USA

PostPosted: Sat Jun 21, 2008 12:58 am    Post subject: Belt tolerances Reply with quote

I own a 50cc B08 Peace Sport with 139QMB engine and I have a Suzuki Burgman 400 and the service manual-belt maint for the Burgman shows to measure the width of the belt and check against the width of a new belt and gives a minimum width in MM which will not apply on these scoots. The decrease in your MPH makes sense for a worn belt.....I will explain. The belt width decreases with wear and tear and as it does this it will ride lower on the back/rear CVT pulley. The lower it rides on the back pulley....the slower it will go due to reduced ratio. SOOOOO. I highly recommend you purchase an inexpensive pair of vernier calipers( A measuring device) from lowe's or home depot and learn how to use them. Hell...the pep boys might carry it also. When you purchase a new belt make sure you measure it and the old belt in MM or millimeters. Report back what the difference is between a new belt and your old one. I am sure you can measure the old belt with it in place as long as you remove the CVT cover. I can measure my belt as it is brand new with only 6km on the scoot.
Best Regards,
Dwayne


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larry8



Joined: 14 Oct 2006
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Location: Cleveland, Ohio USA

PostPosted: Sat Jun 21, 2008 1:17 am    Post subject: Reply with quote

A vernier caliper can be had from Harbor Freight for less than $10US.
Check the tire pressure too. Low pressure will slow down a 50cc scoot 5MPH - more or less.
Also if your tires arent in balance that will effect your top speed. Get a bottle of "Slime" or equavalent tire sealer and balancer - works pretty good. Some use "balancing beads" which only balance the tire not seal it too.



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