Post by jjoshua20213 on May 19, 2014 16:55:56 GMT -5
So ive been wondering if the A9 would help or hurt a stock 139qmb since its designed for the power bbk's put out.
Scootzy created a post about it too. :
I am what I am in my sig. except for the iridium plug. Got to tell you guys about that as well.
Fist bought my scoot, 0-1000mi. orig. plug, changed to an NGK ran for 1500mi. and changed to iridium. 1500mi. later I had spark prob. SO.... I checked the plug only to find out the center dode was hanging off the side of the ceramic coting. I changed back to the NGK plug with 1500mi. on it. Rouhg about 7500mi on this NGK plug.
Ok, Now about the A9.
Is there any other cams for the stock 50cc???
I've seen on you tube, gy6 unspecified cc's, that he broke both vv springs inner and outter from just installing an A9 cam.
Is this true on a stock app?
?
scrappy's mo says it is ok to use on stock app.
what do you guys say?
So I just thew it in to fully test it out, and lets just say i'm never taking it out.
Better, smoother accel all the way around and mid to high rpm lift raises top speed.
Stock took way too long to open the valve in order to have quicker more efficient ignition.
Stock head, cylinder& piston.
No installation problems or running problems.
I used to recommend the A9 only for bbk's but now I recommend it for all 139qmb engines.
I think the stock camshaft is a bottle neck or the "restrictor" everyones trying to find on their scooter. I've installed a bbk and gained ZERO actually lost top speed with the stock camshaft. Haven't played with gears due to the complicated pressing involved, but i'm sure that is a bottle neck too. Unless the engine is able to over rev itself to destruction I feel there are restrictions whether physical,air/fuel or electrical. I'd rather have capabilities and self control than limitations and irritation.
Thanks for reading!
Scootzy created a post about it too. :
Fist bought my scoot, 0-1000mi. orig. plug, changed to an NGK ran for 1500mi. and changed to iridium. 1500mi. later I had spark prob. SO.... I checked the plug only to find out the center dode was hanging off the side of the ceramic coting. I changed back to the NGK plug with 1500mi. on it. Rouhg about 7500mi on this NGK plug.
Ok, Now about the A9.
Is there any other cams for the stock 50cc???
I've seen on you tube, gy6 unspecified cc's, that he broke both vv springs inner and outter from just installing an A9 cam.
Is this true on a stock app?
?scrappy's mo says it is ok to use on stock app.
what do you guys say?
So I just thew it in to fully test it out, and lets just say i'm never taking it out.
Better, smoother accel all the way around and mid to high rpm lift raises top speed.
Stock took way too long to open the valve in order to have quicker more efficient ignition.
Stock head, cylinder& piston.
No installation problems or running problems.
I used to recommend the A9 only for bbk's but now I recommend it for all 139qmb engines.
I think the stock camshaft is a bottle neck or the "restrictor" everyones trying to find on their scooter. I've installed a bbk and gained ZERO actually lost top speed with the stock camshaft. Haven't played with gears due to the complicated pressing involved, but i'm sure that is a bottle neck too. Unless the engine is able to over rev itself to destruction I feel there are restrictions whether physical,air/fuel or electrical. I'd rather have capabilities and self control than limitations and irritation.
Thanks for reading!
Main Jet
