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Flaw636



Joined: 25 Oct 2007
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Location: United States- Detroit

PostPosted: Thu Nov 01, 2007 4:01 am    Post subject: Still boggin Reply with quote

Hi all, I went in and got the cr7hsa plug for the 39QMB 50cc, and the guy said it should be pre gapped, I installed it but see no difference. The scoot is still boggin out when trying to accel rrom 0 to 5km hr,after 5km it seems like it accelerates like it should. Could it be a tight engine? Its a new scoot and it has 25 miles on it. I tried the 10 second at full throttle, then cool down for 10 seconds, it seemed to increase my top speed so far to 38mph (60km)but that was with the old plug, Now it seems to be suckin the gas down fast, 25 miles off a full tank and less than half a tank left.so I guess I'm just wondering what I should try next and anyone know the correct gapping?
Thanks



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Yellow Scooter



Joined: 20 Mar 2007
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Location: North Carolina USA

PostPosted: Thu Nov 01, 2007 11:32 am    Post subject: Reply with quote

For a brand new engine, 50miles to a tankfull sounds a bit much, but it's not that far from right. It has to break in before you'll see the 75-85 mpg. I think you just got a very tight motor.
I'm curious about that bogging during initial takeoff. when the light turns green, are you just jerking that throttle open? These bikes dont like it when you do that. When the clutch grabs as your takin off, it takes a second or 2 for the variater to open and drop the belt for your low-gear setting. Try a nice steady roll onto the throttle and it should smooth out.



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Flaw636



Joined: 25 Oct 2007
Posts: 122
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Location: United States- Detroit

PostPosted: Thu Nov 01, 2007 4:03 pm    Post subject: Reply with quote

Thanks Scoot, I went out today and kick started it, it ran at a higher rpm since it was cold but then just stalled after about two minutes.(like someone just shut the gas off) I tried re-starting it but it didnt want to start right up(electric start)so I let it set a minute or two, tried again and it started right up. I Checked the gas line to make sure it wasnt crimped and From a dead stop, I tried giving it the least amount of throttle possible after it warmed up trying to caress the throttle but it still bogged way down and almost stalled. My other ChualL runs stronger but it too hesitates. I'm not giving them full throttle but its like they dont want to take any gas until 5km. I still might not have gapped the plug right, I think its .025
omg did I say caress the throttle? Question



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einstein1984



Joined: 22 Oct 2007
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Location: Romania, Bucharest

PostPosted: Thu Nov 01, 2007 4:09 pm    Post subject: Reply with quote

That sounds more like a mixture problem, or poor idle rpm setting. What colour was the plug you took out?



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Flaw636



Joined: 25 Oct 2007
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Location: United States- Detroit

PostPosted: Thu Nov 01, 2007 4:12 pm    Post subject: Reply with quote

The original plug was only in for a week but when it pulled it it was a little black, appeared to be running a little rich. Also I noticed I am supposed to put 92 octane, I accidentally put 87 octane if that makes a diff.



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Flaw636



Joined: 25 Oct 2007
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Location: United States- Detroit

PostPosted: Sat Nov 03, 2007 9:46 pm    Post subject: Reply with quote

The 50cc QMB is now finally running better, The scooter has less bog after adjusting the muxture screw just a bit although I think its still running a bit rich, the only upgrades to the scoot so far are just the cr7hsa plug, but now I'm hitting a top speed of 56km but it seems like it just wont go sny faster so I think I'm going to look for the pink wire which intimidates me but if I cut the pink wire(if I have one) and add the free flow air cleaner is it a must I change the rollers or anything else? what would make the top speed a little faster basically
Thanks in advance



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Fox



Joined: 05 Jan 2007
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PostPosted: Sun Nov 04, 2007 3:51 am    Post subject: Reply with quote

I hate to be the bearer of bad news Flaw, but the top speed is pretty much going to be around 45-50 mph no matter what you do to it. The thing about free flows, jets, and rollers is not to gain top speed, but to make it reach top speed quicker and to increase hill climbing performance. The reason is because the gearing in the rear end and the engine red-line are a constant. Theres no increasing red-line rpm. You can if you have money to burn put in different gears in the back, get a variator with a slightly larger diameter, put a 70 or 80 cc cylinder kit, a bigger carb., and a custom exhaust on it and maybe get 60 or 65 mph out of it but after all that, you could have bought a 125cc or a 150cc scoot that does 60mph out of the crate. But by all means, cut the pink wire and get some 4 or 5 gram rollers because a de-restricted scoot that is as quick as it can be is fun because you can keep up with traffic.

50 cc scoots are mainly around to act as an alternative means of transportation on short to medium commutes to save money on gas. If you stop dwelling on how slow you are going and concentrate on how much money you are saving it is actually quite fun to cruise around town. In heavy traffic we have the advantage. It beats the hell out of waiting for the bus! Wink Icon_icon_scooter-


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Flaw636



Joined: 25 Oct 2007
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Location: United States- Detroit

PostPosted: Mon Nov 05, 2007 4:57 am    Post subject: Reply with quote

Quote:
The thing about free flows, jets, and rollers is not to gain top speed, but to make it reach top speed quicker and to increase hill climbing performance. The reason is because the gearing in the rear end and the engine red-line are a constant


AHA! now I get it. Icon_icon_hello_wave



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