Planet Minis

bluebanshee · 03-01-2007, 06:44 AM

I got the 20mm sheng wey
bearing race cam
clamp on filter
ported 25/22mm valve head

it revs ok up to 1/4 throttle. wants the choke then it needs to be taken off. i tried all the needle settings and it runs the best middle to bottom clip and <1 turn out of the mixture screw. I don't know where to start with this. I hope the porting didn't screw up the velocity...

bluebanshee · 03-05-2007, 11:13 AM

bump?

Z · 03-05-2007, 11:14 AM

Quote:

Originally Posted by bluebanshee

I got the 20mm sheng wey
bearing race cam
clamp on filter
ported 25/22mm valve head

it revs ok up to 1/4 throttle. wants the choke then it needs to be taken off. i tried all the needle settings and it runs the best middle to bottom clip and <1 turn out of the mixture screw. I don't know where to start with this. I hope the porting didn't screw up the velocity...

Is the bike still a 70cc, or are you running an 88cc's?

bluebanshee · 03-06-2007, 06:41 AM

Yep still 72cc. Have to give it the throttle slow around 1/4, but revs up fast after that without a load to over 10k rpms.

fatcaaat · 03-06-2007, 06:49 AM

I don't know what jets the Shengway runs, but a stock 72cc motor with a 20mm Mikuni VM20 carb jets best at 15/130. If you could find the size of those jets and match them relative to the Shengway you'd be golden.

Sounds to me like your pilot is too big and/or your needle should be moved one notch upward.

bluebanshee · 03-06-2007, 04:36 PM

fatcaat, when you say stock is that completely stock? The SW takes Kehein jets, and has an 86 main. I guess I could measure a 130 mikuni and get the similiar in Kehein jets. It just doesn't have that pickup that I was hoping for and only winds out on the flats.

03-01-2007, 06:44 AM	#1 (permalink)
bluebanshee PM Newbie Join Date: Jan 2007 Posts: 40	20mm ct70 jetting help I got the 20mm sheng wey bearing race cam clamp on filter ported 25/22mm valve head it revs ok up to 1/4 throttle. wants the choke then it needs to be taken off. i tried all the needle settings and it runs the best middle to bottom clip and <1 turn out of the mixture screw. I don't know where to start with this. I hope the porting didn't screw up the velocity...

03-05-2007, 11:13 AM	#2 (permalink)
bluebanshee PM Newbie Join Date: Jan 2007 Posts: 40	bump?

03-06-2007, 06:41 AM	#4 (permalink)
bluebanshee PM Newbie Join Date: Jan 2007 Posts: 40	Yep still 72cc. Have to give it the throttle slow around 1/4, but revs up fast after that without a load to over 10k rpms.

03-06-2007, 06:49 AM	#5 (permalink)
fatcaaat 3rd Gear Member Join Date: Sep 2004 Location: Arlington, VA Posts: 3,972	I don't know what jets the Shengway runs, but a stock 72cc motor with a 20mm Mikuni VM20 carb jets best at 15/130. If you could find the size of those jets and match them relative to the Shengway you'd be golden. Sounds to me like your pilot is too big and/or your needle should be moved one notch upward.

03-06-2007, 04:36 PM	#6 (permalink)
bluebanshee PM Newbie Join Date: Jan 2007 Posts: 40	fatcaat, when you say stock is that completely stock? The SW takes Kehein jets, and has an 86 main. I guess I could measure a 130 mikuni and get the similiar in Kehein jets. It just doesn't have that pickup that I was hoping for and only winds out on the flats.

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