Post by jake aka:ventoscoot on Oct 19, 2010 22:33:50 GMT -6
I really like my ceramic 160 kit from scrappydog they carry a 180 kit as well.
2007 Vento Phantom GT5 150cc(160cc w/59mm kit) Iridium plug, MRP coil and CDI UNI Filter, Custom exhaust with O2 Sensor, 28mm FS carb LED forward assist lighting and ground effects, Tail Mods, removed stock air box and all CARB crap, new head with no EGR valve. And a bunch of other crap!! THE PUNISHER!
The P engines have a taller head, (73 mm) a different cam lobe, larger valves and bigger ports. They produce a couple of HP more than the 'standard' GY6...
You can use a 'standard' BB on the P engine, but you can't use the standard cam chain. As I recall the P engines can chain is one link longer. I think the chain sprocket on the crank shaft is the same, but I'm not certain...
I think that is the only change you need to make...but for 180cc you need to enlarge the hole in the case...
The reason I mentioned this is many guys have put standard BBs on their P engines and have a lot of trouble even getting them to run...until they replace the cam chain...
Just trying to inform and save you headaches...
Last Edit: Oct 21, 2010 10:52:20 GMT -6 by sprocket
Post by monstergy6 on Oct 21, 2010 13:34:22 GMT -6
Most of the motors we work on are the 1P57QMJ, I have not found those to have the taller cylinder. My personal scooter has a 1P57QMJ and it takes the stock everything, I have a 63mm kit on mine.
Now the motors that have a two bolt valve cover, some of these have a different cylinder, if you have a two bolt valve cover, then measure the cylinder bolts diagonally, if they are 3" then the stock sizes apply, if it is 3.25, then that is a different cylinder and harder to find.
I have also found the scooters made by QJ (Quing Jang), Keeway, I think the UM Matrix, and there are a few others, also have the different motor with a different bolt pattern and taller cylinder. About 18 months ago I worked on this Keeway with the weird motor, It looks like that motor number is KW158QMJ it had the odd bolt pattern for the cylinder, it also had a longer timing chain, the bore was 57.5mm, the crank was also different.
It gets really confusing, but again I have not found the 1P57QMJ to be a problem, If you want to do the 63mm (180) kit we have the cases that are already bored out.
I hope this helps, all the input from everybody is helpful when it comes to this issue.
Post by monstergy6 on Oct 21, 2010 19:41:33 GMT -6
Maybe I am missing something here but on my P157QMJ & all the other ones we work on and build the regular head works just fine, my cam chain is the stock size. Now agreed when you use a BB kit you want to go to a BB head as well otherwise the combustion chamber is too small.
By the way what is the make and name of this scoot in question?
monster, its a home built trike i use to get around town . The motor was bought off ebay new a couple of months ago. the # off motor is BD1P39MB and other # on motor is 50030667.For all your trouble i will be buying the parts from you thanks