Page 1 of 3

50mm bore, 35mph, please help

Posted: Wed Mar 23, 2011 9:17 pm
by Pierce ramsay
ok so here is the scoop
50mm bore poli
9:1 gears
8.5 rollers
28mm V8 exhaust
24mm carb (45,130jets)
ct intake
and i still only go 35-40mph and i cant grab full throttle or she will die :( and bog out, please help.

one more question, i am premixing 40:1, i took the tube that normaly goes to the carb from the oil pump and screwed a screw in it, she leaks only barley, i want to take my oil tank and make it an extra gas tank with a "T" fitting and combine the gas tank and the oil tank as one tank.
so here is the question Can I Run with a Screw in the oil delivery line? and then connect with gas line????? or is running the oil pump dry BAD?
here is a link to the oil tank becoming a gas tank idea
http://www.hondaspree.net/phpBB3/viewto ... d&start=15

Re: 50mm bore, 35mph, please help

Posted: Wed Mar 23, 2011 9:24 pm
by bakaracer
Your main jet is to big. Try a 120. If your carb has the power jet,disconnect it.up that pilot to a 48 or 50.

Re: 50mm bore, 35mph, please help

Posted: Wed Mar 23, 2011 10:10 pm
by odinxxix
running the pump dry is bad, get a hold of vtcycles and get a pump plug for you scoot. and if you can modify you oil tank outlet to accept a fuel fitting then by all means go for it. might want to post a how to after you results have been proven to work.

Re: 50mm bore, 35mph, please help

Posted: Wed Mar 23, 2011 10:25 pm
by Pierce ramsay
ok jetting down it is. one more question, what is a power jet?? function that you talk about?
also will order a plug, and will be more than happy to post a how to on conversion of oil tank to extra gas tank
Thanks guys

Re: 50mm bore, 35mph, please help

Posted: Wed Mar 23, 2011 11:06 pm
by Petrock's 1984 Spree
VT cycles is no longer in business

Scooter assasins has one for close to $25 which is pretty steep. You could make your own out of change for about $3 bucks :smile:

Re: 50mm bore, 35mph, please help

Posted: Wed Mar 23, 2011 11:35 pm
by bakaracer
Pierce ramsay wrote:ok jetting down it is. one more question, what is a power jet?? function that you talk about?
also will order a plug, and will be more than happy to post a how to on conversion of oil tank to extra gas tank
Thanks guys
the power jet carb has a hose that goes from the float bowl to the mouth of the carb.

Re: 50mm bore, 35mph, please help

Posted: Thu Mar 24, 2011 12:55 am
by Trafficjamz
Petrock's 1984 Spree wrote:VT cycles is no longer in business

Scooter assasins has one for close to $25 which is pretty steep. You could make your own out of change for about $3 bucks :smile:

it is only $15 for forum members

Re: 50mm bore, 35mph, please help

Posted: Thu Mar 24, 2011 7:52 pm
by Pierce ramsay
ok jetting down it is. one more question, what is a power jet?? function that you talk about?
also will order a plug, and will be more than happy to post a how to on conversion of oil tank to extra gas tank
Thanks guys

the power jet carb has a hose that goes from the float bowl to the mouth of the carb.

ok i have a screw on the top of the carb, is that ok, should i remove it, or should i take the hose off?

Re: 50mm bore, 35mph, please help

Posted: Thu Mar 24, 2011 9:00 pm
by Bear45-70
This is a powerjet carb. The power jet is the hose from the front top of the float bowl to the top of the air inlet.

Image

Re: 50mm bore, 35mph, please help

Posted: Fri Mar 25, 2011 7:44 pm
by bakaracer
Disconnect the hose from the top nipple and plug the hose with a screw .

Re: 50mm bore, 35mph, please help

Posted: Sat Mar 26, 2011 12:28 am
by Wheelman-111
Greetings:

You can purchase vacuum line caps at Autoparts stores and just cap the barbs,too.

Re: 50mm bore, 35mph, please help

Posted: Sat Mar 26, 2011 12:45 am
by Bear45-70
Or just force a BB or a small ball bearing into the hose and reconnect it to the nipple.

Re: 50mm bore, 35mph, please help

Posted: Sat Mar 26, 2011 10:47 am
by Trafficjamz
Bear45-70 wrote:Or just force a BB or a small ball bearing into the hose and reconnect it to the nipple.
That how we do it a Trafficjamz :2thumbs:

Re: 50mm bore, 35mph, please help

Posted: Sun Mar 27, 2011 10:14 am
by Pierce ramsay
ok, i have 2 BB's in there have a screw on the top and its reconected, jetted to 48/125 as i have no smaller mains than that, but have some on the mail on there way here!! :) she is running better but i think still a little rich, now i can hit 40mph with out too much struggle.

Re: 50mm bore, 35mph, please help

Posted: Sun Mar 27, 2011 12:48 pm
by Wheelman-111
Greetings:

Consider dropping the needle while you wait for the 122-118-115 mains to arrive.
The pipe is a determinant of the optimal Main size, as is engine displacement and even the Air's Density Altitude.
That said, Flash liked the 118-120 @72cc and PG Long.