Spree Engine Swap: Honda Elite CH80 onto Spree

[Tyler VR]

I decided to try a cv carb mod I've been researching, I drilled the vacuum hole slightly larger on the throttle slide. I noticed a little improvement with acceleration, not bad for a free mod.

[patthesoundguy]

Wow I was thinking of doing that with my aero 80 last week but decided not to with out having gotten another variator to try it with looks like you did the same thing so smart The moped guys do that to the Honda hobbit pa50 variator but what they do is actually cut the wall out completely at the end of each ramp. http://outofcontrolmopeds.blogspot.ca/2 ... ching.html I wonder if you could save that variator doing that, because you could polish each ramp smooth so the rollers won't catch and cause your flat spot in the acceleration.

Sent from my Nexus 7 using Tapatalk 2

I thought about cutting out the end of the ramp, but figured it might be too much. It was experimental, now I'm thinking about modding a variator from a dio or gy6 to fit my ch80. But it's a gamble, could be a waste of my time and money.

A gy6 racing variator is likley to fit i bet. I took a chance on one for 24$ free shipping for my Aero 80. It might be too large by a little but ill find out in a couple weeks. The outer diameter is 115mm acording to the auction on ebay. http://www.ebay.com/itm/KOSO-Sport-Perf ... 3f1f01b9cd

Sent from my LG-C800G using Tapatalk 2

[Tyler VR]

A gy6 racing variator is likley to fit i bet. I took a chance on one for 24$ free shipping for my Aero 80. It might be too large by a little but ill find out in a couple weeks. The outer diameter is 115mm acording to the auction on ebay. http://www.ebay.com/itm/KOSO-Sport-Perf ... 3f1f01b9cd

Sent from my LG-C800G using Tapatalk 2

I'm thinking a 50cc gy6 variator might be all I could fit on the ch80, the outer diameters of those are 87mm. The stock outer diameter of the ch80 variator is 94mm, but it has a lip/edge on the variator at about 80mm wide the belt can't go past.

[Tyler VR]

Trying another cv carb mod on the ch80, cut 1 coil off the slide spring. Helped with throttle response, a little better acceleration. Maybe I'll try to cut off another half coil someday.

[patthesoundguy]

A gy6 racing variator is likley to fit i bet. I took a chance on one for 24$ free shipping for my Aero 80. It might be too large by a little but ill find out in a couple weeks. The outer diameter is 115mm acording to the auction on ebay. http://www.ebay.com/itm/KOSO-Sport-Perf ... 3f1f01b9cd

Sent from my LG-C800G using Tapatalk 2

I'm thinking a 50cc gy6 variator might be all I could fit on the ch80, the outer diameters of those are 87mm. The stock outer diameter of the ch80 variator is 94mm, but it has a lip/edge on the variator at about 80mm wide the belt can't go past.

My aero 80 variator is 96mm and I had it off yesterday and there seems to be enough room for that gy6 variator I have coming. I'll keep you posted I should have ordered the other half of the pulley so the two sides of the variator will match. I'm so very curious to see what happens with that new variator, it was worth the money just to see

Sent from my Nexus 7 using Tapatalk 2

[Tyler VR]

I bought another ch80 engine, now I have 2 spares. This newer model ch80 is nearly complete and looks clean. I'm planning on bolting it up to the spree and seeing how well it runs.

This winter I'm planning a porting project on a ch80 engine, should just be mostly head work. I've fully ported a stock bore nq50 engine last winter and took a lot of pics, check it out:
viewtopic.php?f=16&t=25780

[Tyler VR]

That will be a really nice swap in a spree. Smooth power. Your going to have to really strengthen up the spree frame where the ch80 mounts.

It's an okay swap, kinda funny having a 4 stroke spree.

The engine mounting is on pages 2 and 3, instead of making a conversion mount I fabbed the partial ch80 frame onto the spree. I didn't show all my work, but a lot of re enforcement was done. There's a lot of easier swaps that have more potential for speed but the ch80 is bullet proof and gets good mpg.

[Tyler VR]

On the battlescooter website there's a ruckus with a ch80 swap. Looking closly at the pic I can see that's not the stock cv carb. After searching for more info on it I finally emailed them and got a response.

Hi, I installed a Keihin PE20, it worked awesome. What that and the custom pipe I got huge gains.

Best regards,
Jason

Good to know someone had success putting a different carb on the ch80. It's a spigot mount type carb, I'm looking at some flange mount carbs now. I actually tried a old stock nh125 carb on the ch80 with the smallest jets I had. It started up but wouldn't rev much, the carb was leaking gas and it was just too rich for the ch80.

http://battlescooter.com/27.html

[Tyler VR]

I decided to buy a round slide carb to replace the stock cv carb. It's a pz19 carb that was $20 shipped off ebay. The flange bolts are wider and the opening is 19mm, the stock carb is 18mm.

I got it to run and rev up but haven't road it yet, got the rear tire to spin inside my garage though. I do expect some jets will need changing and messing around with tuning.

But it's mounted at a weird angle and it's leaking fuel out of the bowl overflow. I'm planning to make a adapter plate or mod the intake manifold to correct this issue before I test ride.

[Tyler VR]

My adapter plate idea didn't work out so I'm modding the intake manifold.

Cut in half, turn the flange to change the angle and weld it back together.

[Tyler VR]

I got the intake manifold welded and the carb is mounted at a correct angle now, not leaking fuel anymore. It actually fit up with the stock snorkel and air box, which doesn't fit under my spree body plastics.

So I'm running a foam filter and working on tuning. The jets that came on the PZ19 carb are unlabeled but I can feel I needed a larger main jet. This carb is sorta a copy of a keihin brand and actually uses the same size main jets as the stock ch80 CV carb. So I swapped in the 88 main, which is the common stock ch80 main jet. Seems to run better on the top end, might even try larger main jets.

Acceleration is great, nice to hit wide open throttle whenever I want. Not like with a CV carb that needs a vacuum diaphragm to raise for WOT.

[sleeperelite]

The CDI and coil pic posted are exactly what I swapped in. With a 100 main jet and Polini foam air filter my mid range and top end were less temperamental and overall power increased

[sleeperelite]

That CDI does have a rev limit. The "no rev limit" to which they are referring is that it is increased from the stock Honda rev limit. That CDI was originally meant for Honda scoots that were limited from the factory. It's supposed to be used in conjunction with other means to derestrict Honda scoots such as restricted exhausts, carb jets and those washers that limit top speed on the variator.

[sleeperelite]

The same CDI on my AF16 added better mid-range torque as well and a couple mph on my top end.

[Tyler VR]

A lot of people say different things about the performance CDI, but it's hard to prove anything without a rpm gauge or a dyno. Someone else said the stock CDI doesn't have a rev limit either, I think the valves would start to float before you hit a high enough rpm. Someday I'll switch back to the stock CDI to see if it's any different.

I do think my exhaust is limiting my performance, when I had to mod the stock header pipe it probably reduced performance. Even with the carb upgrade my top speed is still around 45mph, so I'm planning on a completely new homemade exhaust header from the flange back.