Need More Top End??????????
Moderator: Moderator
Need More Top End??????????
My 66cc build in my signature has me stumped. Last year I was able to hit 50mph on 9.1 gears. This year I did the ZX and 8.44 to get some more top end and I got 2 more mph. I've tried everything from weights to springs and either the weights are to light and the motor is scream'n and going no where or to heavy and takes awhile to get up to 52mph@8800rpm.I have read other's doing 58-60mph on a 66cc. What am I missing? Do I need a bigger carb? Bigger BBK?
94 elite 50s
----
66cc bbk
118jet/Pre-Mix32:1
1"uni-filter,Keli 9g
1k center,8.44 gears,ZX Trans
V8 Pipe,IRC MB38 80/90 tires
H4 H.I.D
94 elite 50sr
-----
50mm BBK,105jet
1" Uni-Filter,8:44gears
----
66cc bbk
118jet/Pre-Mix32:1
1"uni-filter,Keli 9g
1k center,8.44 gears,ZX Trans
V8 Pipe,IRC MB38 80/90 tires
H4 H.I.D
94 elite 50sr
-----
50mm BBK,105jet
1" Uni-Filter,8:44gears
- Trafficjamz
- CBR1000RR
- Posts: 5353
- Joined: Tue Jul 14, 2009 7:53 pm
- Location: Eastlake, MI
- Contact:
Re: Need More Top End??????????
The ZX does not give you extra top end speed.
Go back to the S trans for top speed.
Go back to the S trans for top speed.
new best 1/8th mile time 9.647 seconds @67.155 mph 310lbs total weight
- Trafficjamz
- CBR1000RR
- Posts: 5353
- Joined: Tue Jul 14, 2009 7:53 pm
- Location: Eastlake, MI
- Contact:
Re: Need More Top End??????????
what size is your belt?
new best 1/8th mile time 9.647 seconds @67.155 mph 310lbs total weight
Re: Need More Top End??????????
if your maxing out at 8800rpms with the setup you have now, thats your issue. with the v8 pipe you should be seeing more in the 9500 rpm range. even a stock pipe will rev higher than 8800rpms. what cht temps are you seeing at wot?ZMUD wrote:My 66cc build in my signature has me stumped. Last year I was able to hit 50mph on 9.1 gears. This year I did the ZX and 8.44 to get some more top end and I got 2 more mph. I've tried everything from weights to springs and either the weights are to light and the motor is scream'n and going no where or to heavy and takes awhile to get up to 52mph@8800rpm.I have read other's doing 58-60mph on a 66cc. What am I missing? Do I need a bigger carb? Bigger BBK?
Nothing like getting stroked!
Thanks to my sponsors
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90 honda dio sp 72cc
87 elite 50 s with 86cc watercooled mini stroke
87 elite 50 race bike mhr 72cc
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90 honda dio sp 72cc
87 elite 50 s with 86cc watercooled mini stroke
87 elite 50 race bike mhr 72cc
91 yamaha tzr 250r
Re: Need More Top End??????????
Belt is 654x18x30 and I tried the 8.44 without the ZX and the bike hated it.
94 elite 50s
----
66cc bbk
118jet/Pre-Mix32:1
1"uni-filter,Keli 9g
1k center,8.44 gears,ZX Trans
V8 Pipe,IRC MB38 80/90 tires
H4 H.I.D
94 elite 50sr
-----
50mm BBK,105jet
1" Uni-Filter,8:44gears
----
66cc bbk
118jet/Pre-Mix32:1
1"uni-filter,Keli 9g
1k center,8.44 gears,ZX Trans
V8 Pipe,IRC MB38 80/90 tires
H4 H.I.D
94 elite 50sr
-----
50mm BBK,105jet
1" Uni-Filter,8:44gears
Re: Need More Top End??????????
i suspect that 118 main jet is whats causing it. thats a really huge jet for the stock carb
Nothing like getting stroked!
Thanks to my sponsors
Nos Energy Drinks,themopedcompany.com,nwautoevents.com,Cycle Gear
90 honda dio sp 72cc
87 elite 50 s with 86cc watercooled mini stroke
87 elite 50 race bike mhr 72cc
91 yamaha tzr 250r
Thanks to my sponsors
Nos Energy Drinks,themopedcompany.com,nwautoevents.com,Cycle Gear
90 honda dio sp 72cc
87 elite 50 s with 86cc watercooled mini stroke
87 elite 50 race bike mhr 72cc
91 yamaha tzr 250r
Re: Need More Top End??????????
I don't have a temp gauge just a tach. But I dont think it has much rpm left IMO. I am running no oil pump and plug is perfect.
94 elite 50s
----
66cc bbk
118jet/Pre-Mix32:1
1"uni-filter,Keli 9g
1k center,8.44 gears,ZX Trans
V8 Pipe,IRC MB38 80/90 tires
H4 H.I.D
94 elite 50sr
-----
50mm BBK,105jet
1" Uni-Filter,8:44gears
----
66cc bbk
118jet/Pre-Mix32:1
1"uni-filter,Keli 9g
1k center,8.44 gears,ZX Trans
V8 Pipe,IRC MB38 80/90 tires
H4 H.I.D
94 elite 50sr
-----
50mm BBK,105jet
1" Uni-Filter,8:44gears
Re: Need More Top End??????????
i got way more to go. the v8 can rev all the way to 10300rpm. if your running that size jet and theplug looks good then you must have a leak somewhere letting air in. because thats a really big jet. that size jet is whats used in a 24mm carb. stock is 14mmZMUD wrote:I don't have a temp gauge just a tach. But I dont think it has much rpm left IMO. I am running no oil pump and plug is perfect.
Nothing like getting stroked!
Thanks to my sponsors
Nos Energy Drinks,themopedcompany.com,nwautoevents.com,Cycle Gear
90 honda dio sp 72cc
87 elite 50 s with 86cc watercooled mini stroke
87 elite 50 race bike mhr 72cc
91 yamaha tzr 250r
Thanks to my sponsors
Nos Energy Drinks,themopedcompany.com,nwautoevents.com,Cycle Gear
90 honda dio sp 72cc
87 elite 50 s with 86cc watercooled mini stroke
87 elite 50 race bike mhr 72cc
91 yamaha tzr 250r
- Trafficjamz
- CBR1000RR
- Posts: 5353
- Joined: Tue Jul 14, 2009 7:53 pm
- Location: Eastlake, MI
- Contact:
Re: Need More Top End??????????
Did you change the pulley boss when you did the zx swap?
Mark the variator and make sure the belt is being pushed out all the way.
Mark the variator and make sure the belt is being pushed out all the way.
new best 1/8th mile time 9.647 seconds @67.155 mph 310lbs total weight
Re: Need More Top End??????????
if he didnt and is still using the s boss his lowend would suck not the topend. plus his rpm is kind of low at 8800rpm if thats what the rpm is maxing out at.Trafficjamz wrote:Did you change the pulley boss when you did the zx swap?
Mark the variator and make sure the belt is being pushed out all the way.
Nothing like getting stroked!
Thanks to my sponsors
Nos Energy Drinks,themopedcompany.com,nwautoevents.com,Cycle Gear
90 honda dio sp 72cc
87 elite 50 s with 86cc watercooled mini stroke
87 elite 50 race bike mhr 72cc
91 yamaha tzr 250r
Thanks to my sponsors
Nos Energy Drinks,themopedcompany.com,nwautoevents.com,Cycle Gear
90 honda dio sp 72cc
87 elite 50 s with 86cc watercooled mini stroke
87 elite 50 race bike mhr 72cc
91 yamaha tzr 250r
- Trafficjamz
- CBR1000RR
- Posts: 5353
- Joined: Tue Jul 14, 2009 7:53 pm
- Location: Eastlake, MI
- Contact:
Re: Need More Top End??????????
bakaracer wrote:if he didnt and is still using the s boss his lowend would suck not the topend. plus his rpm is kind of low at 8800rpm if thats what the rpm is maxing out at.Trafficjamz wrote:Did you change the pulley boss when you did the zx swap?
Mark the variator and make sure the belt is being pushed out all the way.
Very true
that 118 jet is probably way to rich
and the scooter just does not have enuff power to push to the higher RPM's
new best 1/8th mile time 9.647 seconds @67.155 mph 310lbs total weight
Re: Need More Top End??????????
I did the complete ZX from VT. Boss,face,rear pulley and clutch.Trafficjamz wrote:Did you change the pulley boss when you did the zx swap?
Mark the variator and make sure the belt is being pushed out all the way.
I run amsoil interceptor so I think thats why I'm jetted so high.Trafficjamz wrote:bakaracer wrote:if he didnt and is still using the s boss his lowend would suck not the topend. plus his rpm is kind of low at 8800rpm if thats what the rpm is maxing out at.Trafficjamz wrote:Did you change the pulley boss when you did the zx swap?
Mark the variator and make sure the belt is being pushed out all the way.
Very true
that 118 jet is probably way to rich
and the scooter just does not have enuff power to push to the higher RPM's
So how many R's can I get out of the 66?
94 elite 50s
----
66cc bbk
118jet/Pre-Mix32:1
1"uni-filter,Keli 9g
1k center,8.44 gears,ZX Trans
V8 Pipe,IRC MB38 80/90 tires
H4 H.I.D
94 elite 50sr
-----
50mm BBK,105jet
1" Uni-Filter,8:44gears
----
66cc bbk
118jet/Pre-Mix32:1
1"uni-filter,Keli 9g
1k center,8.44 gears,ZX Trans
V8 Pipe,IRC MB38 80/90 tires
H4 H.I.D
94 elite 50sr
-----
50mm BBK,105jet
1" Uni-Filter,8:44gears
Re: Need More Top End??????????
O...and Tjamz thanks for that crankshaft you sent me. it worked perfect!
94 elite 50s
----
66cc bbk
118jet/Pre-Mix32:1
1"uni-filter,Keli 9g
1k center,8.44 gears,ZX Trans
V8 Pipe,IRC MB38 80/90 tires
H4 H.I.D
94 elite 50sr
-----
50mm BBK,105jet
1" Uni-Filter,8:44gears
----
66cc bbk
118jet/Pre-Mix32:1
1"uni-filter,Keli 9g
1k center,8.44 gears,ZX Trans
V8 Pipe,IRC MB38 80/90 tires
H4 H.I.D
94 elite 50sr
-----
50mm BBK,105jet
1" Uni-Filter,8:44gears
Re: Need More Top End??????????
that belt height looks good. that oil your using is not the cause for the larger jet. sounds like a leak somewhere thats causing you to up jet so big. what exhaust gasket are you using? also what head are you using? if its the stock one then that the issue right there. to high a compression ratio to the fuel your using.
Nothing like getting stroked!
Thanks to my sponsors
Nos Energy Drinks,themopedcompany.com,nwautoevents.com,Cycle Gear
90 honda dio sp 72cc
87 elite 50 s with 86cc watercooled mini stroke
87 elite 50 race bike mhr 72cc
91 yamaha tzr 250r
Thanks to my sponsors
Nos Energy Drinks,themopedcompany.com,nwautoevents.com,Cycle Gear
90 honda dio sp 72cc
87 elite 50 s with 86cc watercooled mini stroke
87 elite 50 race bike mhr 72cc
91 yamaha tzr 250r
Re: Need More Top End??????????
I figured the oil because "guen84" was having heat issues last year and when he switched oil that all went away.So we figured the oil wasn't for bigger builds but good enough for my 66.bakaracer wrote:that belt height looks good. that oil your using is not the cause for the larger jet. sounds like a leak somewhere thats causing you to up jet so big. what exhaust gasket are you using? also what head are you using? if its the stock one then that the issue right there. to high a compression ratio to the fuel your using.
The exhaust gasket is the one that came with the v8,And yes it is the stock head. This is the 66cc bbk from daywot and it didnt come with a head.
94 elite 50s
----
66cc bbk
118jet/Pre-Mix32:1
1"uni-filter,Keli 9g
1k center,8.44 gears,ZX Trans
V8 Pipe,IRC MB38 80/90 tires
H4 H.I.D
94 elite 50sr
-----
50mm BBK,105jet
1" Uni-Filter,8:44gears
----
66cc bbk
118jet/Pre-Mix32:1
1"uni-filter,Keli 9g
1k center,8.44 gears,ZX Trans
V8 Pipe,IRC MB38 80/90 tires
H4 H.I.D
94 elite 50sr
-----
50mm BBK,105jet
1" Uni-Filter,8:44gears