wzuccarello
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Just swap the shrouds around. They're interchangable between the 2 engines!
Last edited:
Testing the 79 & 99 CC HF motors
- Thread starter Quenton Guenther
- Start date
Hi Mike,
I had the same problem with the factory test bike. It was a nice blue with the 79 CC Greyhound motor which as you know is also blue. I simply exchanged the covers and rope starter assembly and ended up with the 99 CC Predator motor in blue. If you use the 99 CC motor with the flex pipe be sure to drill the main jet out to .031", otherwise it will run too lean.
I agree the 2.75" primary pulley should be ideal with your H.D. [heavy duty, not Harley Davidson] frame.
You can use the motor mounting plate from the Predator as the pattern to drill holes in one of the stock 4-stroke motor mount kits. Be careful as the motor "foot" pattern is staggered on the 99 CC and not the 79 CC. One set of holes is 102 MM and the other is 104 MM. The side mounting holes use 8 MM bolts on the 79 CC motors, whereas the 99 CC motor uses 5/16 X 24 threads [not a common thread size].
You may also need an AX26 belt with the larger primary drive pulley. The AX26 is the same belt used on the vintage Whizzer motors, and you most likely will have one.
Have fun,
I had the same problem with the factory test bike. It was a nice blue with the 79 CC Greyhound motor which as you know is also blue. I simply exchanged the covers and rope starter assembly and ended up with the 99 CC Predator motor in blue. If you use the 99 CC motor with the flex pipe be sure to drill the main jet out to .031", otherwise it will run too lean.
I agree the 2.75" primary pulley should be ideal with your H.D. [heavy duty, not Harley Davidson] frame.
You can use the motor mounting plate from the Predator as the pattern to drill holes in one of the stock 4-stroke motor mount kits. Be careful as the motor "foot" pattern is staggered on the 99 CC and not the 79 CC. One set of holes is 102 MM and the other is 104 MM. The side mounting holes use 8 MM bolts on the 79 CC motors, whereas the 99 CC motor uses 5/16 X 24 threads [not a common thread size].
You may also need an AX26 belt with the larger primary drive pulley. The AX26 is the same belt used on the vintage Whizzer motors, and you most likely will have one.
Have fun,
Richard H.
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How many states would these be legal in for road use and which states would that be?
Hi Richard,
Several states don't have any CC limit and limit HP. For example Whizzers are 138 CC and are legal in CA because of the HP limit. There is another state on the east coast that has put the limit at 5 HP [might be CT, not sure].
We {EZM} will continue to ONLY supply the 49 CC HS 142a motor in our 4-stroke kits, to respect the majority of state rules concerning motorized bicycles. In fact we are making a kit to adapt our Q-Matic drive to several smaller 4-stroke motors for a couple of states that set the limit to 35 CC.
I live in NC and have titled several of my bikes as MC and have plates & insurance on them. I have a large selection of Whizzers [over 20], and the new edition versions must be tagged, but the vintage Whizzers are "grandfathered" in as antique and can either display a plate or not. Of course NC like many states has conflicting laws, and often difficult to understand. In NC one section limits the speed to 25 MPH and in another section it is 30 MPH. Scooters are in the same class as motorbikes, because a few years ago, a large hardware store chain tried to sell electric scooters and had the part of the law requiring "pedals" removed.
I would suggest everyone check their state laws, and even carry a copy, as even Law enforcement has a hard time with some of the rules.
I was once stopped by a NC state trooper and had to listen to him tell me several times I was going 55 MPH. The speed limit was 55 MPH, and the Whizzer had current plates, current safety inspection sticker, a MC endorsment on my lic., and wearing a helmet. He insisted the motor had to be smaller than 50 CC [wrong] and insisted it had to be stamped somewhere on the motor[wrong]. To add more to the story, I had a vintage gas tank on the bike and the original sticker stated "Do not exceed 25 MPH for the first 500 miles", which lead the Trooper telling me "see, you were speeding" [DUH].
Have fun,
Several states don't have any CC limit and limit HP. For example Whizzers are 138 CC and are legal in CA because of the HP limit. There is another state on the east coast that has put the limit at 5 HP [might be CT, not sure].
We {EZM} will continue to ONLY supply the 49 CC HS 142a motor in our 4-stroke kits, to respect the majority of state rules concerning motorized bicycles. In fact we are making a kit to adapt our Q-Matic drive to several smaller 4-stroke motors for a couple of states that set the limit to 35 CC.
I live in NC and have titled several of my bikes as MC and have plates & insurance on them. I have a large selection of Whizzers [over 20], and the new edition versions must be tagged, but the vintage Whizzers are "grandfathered" in as antique and can either display a plate or not. Of course NC like many states has conflicting laws, and often difficult to understand. In NC one section limits the speed to 25 MPH and in another section it is 30 MPH. Scooters are in the same class as motorbikes, because a few years ago, a large hardware store chain tried to sell electric scooters and had the part of the law requiring "pedals" removed.
I would suggest everyone check their state laws, and even carry a copy, as even Law enforcement has a hard time with some of the rules.
I was once stopped by a NC state trooper and had to listen to him tell me several times I was going 55 MPH. The speed limit was 55 MPH, and the Whizzer had current plates, current safety inspection sticker, a MC endorsment on my lic., and wearing a helmet. He insisted the motor had to be smaller than 50 CC [wrong] and insisted it had to be stamped somewhere on the motor[wrong]. To add more to the story, I had a vintage gas tank on the bike and the original sticker stated "Do not exceed 25 MPH for the first 500 miles", which lead the Trooper telling me "see, you were speeding" [DUH].
Have fun,
Last edited:
Richard H.
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Thanks, good advice.
Last edited:
Gen3Benz
Member
Nice work! Great info from your testing.
Where did ya find that air cleaner?
I bought a 79cc back when they started selling them. Took a long break from motoredbikes and think i'm gonna start another project soon.
Where did ya find that air cleaner?
I bought a 79cc back when they started selling them. Took a long break from motoredbikes and think i'm gonna start another project soon.
azbill
Active Member
Benz,,,
that is a chrome whizzer air filter I believe
that is a chrome whizzer air filter I believe
Gen3Benz
Member
Thanks Bill!
Looks like it'll flow better than the original which has to turn 90 degrees to enter the carb.
Looks like it'll flow better than the original which has to turn 90 degrees to enter the carb.
Hi Gen3Benz,
Many have simply used a "tuna" can. Filled with mesh [from pot scrubber from a dollar store] and drilled holes to affix to carburetor and more holes to allow it to flow more air.
Of course a little paint to cover up the "tuna" infromation on the can wouldn't hurt.
I did in fact use a breather from a 1999 Whizzer, and drilled holes to mount to carburetor.
Have fun,
Many have simply used a "tuna" can. Filled with mesh [from pot scrubber from a dollar store] and drilled holes to affix to carburetor and more holes to allow it to flow more air.
Of course a little paint to cover up the "tuna" infromation on the can wouldn't hurt.
I did in fact use a breather from a 1999 Whizzer, and drilled holes to mount to carburetor.
Have fun,
More ratio options on the HF motors using the Q-Matic drive system.
2.5" primary pulley
75 tooth rear sprocket:
2500 RPMS = 12.5 MPH
3600 RPMs = 18 MPH
4500 RPMs = 22.5 MPH
72 tooth rear sprocket:
2500 RPMs = 13 MPH
3600 RPMs = 18.75 MPH
4500 RPMs = 23.4 MPH
2.75" primary pulley
75 tooth rear sprocket:
2500 RPMs = 13.8 MPH
3600 RPMs = 20 MPH
4500 RPMs = 24.8 MPH
72 tooth rear sprocket:
2500 RPMs = 14.4 MPH
3600 RPMs = 20.7 MPH
4500 RPMs = 26 MPH
3" primary pulley
75 tooth rear sprocket:
2500 RPMs = 15 MPH
3600 RPMs = 21.8 MPH
4500 RPMs = 27 MPH
72 tooth rear sprocket:
2500 RPMs = 15.8 MPH
3600 RPMs = 22.7 MPH
4500 RPMs = 28.4 MPH
Have fun,
2.5" primary pulley
75 tooth rear sprocket:
2500 RPMS = 12.5 MPH
3600 RPMs = 18 MPH
4500 RPMs = 22.5 MPH
72 tooth rear sprocket:
2500 RPMs = 13 MPH
3600 RPMs = 18.75 MPH
4500 RPMs = 23.4 MPH
2.75" primary pulley
75 tooth rear sprocket:
2500 RPMs = 13.8 MPH
3600 RPMs = 20 MPH
4500 RPMs = 24.8 MPH
72 tooth rear sprocket:
2500 RPMs = 14.4 MPH
3600 RPMs = 20.7 MPH
4500 RPMs = 26 MPH
3" primary pulley
75 tooth rear sprocket:
2500 RPMs = 15 MPH
3600 RPMs = 21.8 MPH
4500 RPMs = 27 MPH
72 tooth rear sprocket:
2500 RPMs = 15.8 MPH
3600 RPMs = 22.7 MPH
4500 RPMs = 28.4 MPH
Have fun,
