Cutting cylinder skirt to match intake of the block on spree

[Wheelman-111]

Greetings:

Could it be that wise Honda-san kept aperture small to limit the RPM that beginner riders could attain with the entry-level Spree? Trouble is no one will tell you it's a good idea if it means rendering your jug and piston unusable. I've never read anyone raising this question, so gotta figure you'd be breaking new ground. Go for it, keeping in mind you may be needing all-new parts if it fails.

[bradbutlernc]

Its a good and bad thing. Its good for performance, but i would only do it with a forged piston. Opening up the spree intake allows higher RPM and the cast piston is already weak, youll just weaken it more by cutting it. I didnt touch my piston, i just raised the exhaust port 3 degrees, ported the intake and transfers, and milled the head .030. Also went with a 19mm zuma carburetor with an adaptor, and fabricated an expansion pipe exhaust from a 49cc pitbike. Milled the clutch drive face .15 and went with a wider belt. Drilled the clutch shoes for reduced weight, which brought the stall up about 1000 more rpm. It takes off quicker than it did stock and will pull near 55. A non vari engine will never pull as hard down low and up top as a variated engine because of the direct drive system, plain and simple, but that doesnt mean you cant get good speed out of them.

[kingkamehameha]

Spree motors dont do 55 man be realistic. You would have to change the gears for that to be possible. Probably feels like 55 but is more * 35

[Wheelman-111]

Greetings:

The Maff just doesn't work BradButlerNC:

35MPH @ 8,000 RPM (a guess) = 55MPH @ 12,500. I guess it's possible if you can get the Spree to rev up higher than a built-up Corsa. Care to explain how that's possible?

[kingkamehameha]

Greetings:

The Maff just doesn't work BradButlerNC:

35MPH @ 8,000 RPM (a guess) = 55MPH @ 12,500. I guess it's possible if you can get the Spree to rev up higher than a built-up Corsa. Care to explain how that's possible?

Just like others can claim they are hitting past 13k on a mhr or corsa but dont have the port maps to prove it.

[patthesoundguy]

Its a good and bad thing. Its good for performance, but i would only do it with a forged piston. Opening up the spree intake allows higher RPM and the cast piston is already weak, youll just weaken it more by cutting it. I didnt touch my piston, i just raised the exhaust port 3 degrees, ported the intake and transfers, and milled the head .030. Also went with a 19mm zuma carburetor with an adaptor, and fabricated an expansion pipe exhaust from a 49cc pitbike. Milled the clutch drive face .15 and went with a wider belt. Drilled the clutch shoes for reduced weight, which brought the stall up about 1000 more rpm. It takes off quicker than it did stock and will pull near 55. A non vari engine will never pull as hard down low and up top as a variated engine because of the direct drive system, plain and simple, but that doesnt mean you cant get good speed out of them.

Great point about the piston. I thinking about the durability of hacking up the base of the piston earlier tonight as I had a brand new one in my hands and a cylinder to look at. I like the idea of drilling the clutch maybe to raise the rpm at which it engages. What did you do for the adapter for the carb, is it something you fabbed up or did you buy it. I'm totally sold on the porting idea, from what I finding porting is a big thing to make the spree wake up.
I'm wondering what 3 degrees translates to in mm for the exhaust port raising. Did you raise the intake ports as well or just make them wider? Thanks for you input it all gives me something to think about.
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[noiseguy]

It takes off quicker than it did stock and will pull near 55.

Heh. You're going to need a printout from the local drag strip with trap time and speeds to convince folks here on that top speed.

How much mass did you remove from the clutch shoes, BTW?

[patthesoundguy]

I'm curious what kind of rpm its spinning, is there a tach on that thing. Im really glad I have a digital tach a CHT and a mount for my phone for GPS on my spree, I couldn't see if I'm making any changes for the better with out them.

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[Wheelman-111]

Greetings:

That's the best-instrumented Spree in all the world. But where's the Altimeter?

[patthesoundguy]

lol the altimeter is in the phone GPS

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[bradbutlernc]

It realistically will do probably 50 on flat land, 55 down a hill This is with a 200lb rider. It ran 40 stock with just a wider belt, gps verified. If my spree isnt fast enough to get me where i need to go i have a car that certainly will.

[kingkamehameha]

It realistically will do probably 50 on flat land, 55 down a hill This is with a 200lb rider. It ran 40 stock with just a wider belt, gps verified. If my spree isnt fast enough to get me where i need to go i have a car that certainly will.

No it wont

[tazland001]

lol 55. You hear that king. He is so full of s h i t.

Bro even if you shaved the face and ran a wider belt and did all the mods you still wont hit55mph. There are 3 major factors that keep the spree from hitting 50+. Short stroke, no variator and no room for taller gear ratios. Also if you did the wider belt and shaved the face you would have no lows. So all you have is

Taz

[Wheelman-111]

Greetings:

Short stroke is actually an advantage if you plan to increase RPM. It keeps piston speeds lower. This brings us to the Fourth Factor:
The fourth factor is a low-revving engine designed for torque off the line pushing a single-speed transmission. That factor CAN be addressed through extensive and Artful porting. But at the RPM necessary to go 50, one will almost certainly encounter lack of cooling and/or lubrication issues. And you can kiss what's left of take-off grunt goodbye. Still, I for one would like to see it.

[kingkamehameha]

I will paypal 100 dollars to anyone who can make a video of a spree witht the original spree motor go past 50. Being dragged by a car doesnt count haha