I cannot answer about 100cc bbk, but the 72cc bbk seems to add more takeoff torque. It actually has a bit of 'grunt' when you open the throttle. A 39mm piston will not allow acceleration while climbing the hill leading from home. A machine with a 47mm piston and cylinder will accelerate, or can, when climbing the hill. A '100cc' bbk should do even more. At lower engine speeds, you'll have more torque, and actually don't need the flow rate of a larger carburetor. You would need the flow at higher rpms, but if the carb cannot flow, the engine won't know, it will just consume whatever it is fed. You can expect a bit higher top speed, but be careful you aren't revving the beans out of the engine while running fast. Having a tach connected, even temporarily, can be of value when figuring out if things are working properly. If you get consistent and quick pops to high rpm without any increase in speed, that's an indication of the need for CVT investigation, for example. In my case, I figured a bit more variator weight, and finally a new belt, and it made a big difference. tom
It's not how hard you work, it's how much you get done. simplificate & add lightness
Post by donaldsonta on Dec 11, 2019 12:53:23 GMT -5
If you're trying to keep it super cheap I'd probably do the 80cc (actually 72), pod filter, drill the muffler, and rejet. That's about $40-45, leaves you plenty of room for a decent belt, tuning weight set, and a set of rollers.
That will probably be a very significant improvement on a stock 49 with unknown rollers, but without getting into a bunch of money.
**2007 Manco Matrix** 72cc cyclinder, stock head, stock carb Foam filter, straight pipe, 100 main 6g rollers, stock clutch and spings, vented CVT cover 10 inch rims Kenda 3.5R10 K329s 23k on the Chinometer, another few thousand unaccounted for.
I have used a few super cheap 80cc kits here in the U.K. and find they valves burn out quite quickly in the head and that's with the correct valve clearances. So might be worth lapping in the valves before using. At £24 for a complete bbk can't expect quality that's for sure. Barrel and pistons hold up well. Beat I found is the Naraku products bit more in price but better quality.
Violet the Vespaclone (lml star 2t 150cc 4speed) with sidecar. LML Cut Down 125cc 2006 It's TYRE'S not TIRE'S A reminder to self, do not buy anymore damn scooters especially Peugeot's or Vespa 4 poke with in inaccessible spark plugs ever!
Senna1Rossi: Thanks renagade281!
May 23, 2016 14:59:12 GMT -5
Fox: I don't really know how to say this but straight. I am Dave's Girlfriend Kellilee and bluntly and VERY SADLY he passed away early Tuesday morning. I know he would want ya all to know this. Thank You Brent for befriending my love he was very happy on here!
Jun 18, 2016 16:26:04 GMT -5
Fox: www.gofundme.com/29mgf6b8 I hope it is ok to pass on his gofundme page link. If not you will un-post it I'm sure. Thanks again all!!
Jun 18, 2016 16:31:18 GMT -5