Re: Treats piston port VS MK reed kit, A Review

Seems like a shit ton of work. I know that the challenge is half the fun, but Polini/15 Bing does 50+ out the box, 60+ with some simple porting and a 19 del phbg...

I can't imagine the allure of this kit other than being able to say you got it to work properly, lol. Which would be pretty cool I guess.

Re: Treats piston port VS MK reed kit, A Review

In my eyes it a cylinder meant to be ported for race use only pretty much. Its got a huge reed block, big transfers, and a bridged exhaust making it the best candidate for a race 70cc cylinder, as far as I'm concerned. I'm pretty sure this could be a 65+ cylinder done up right.

I can't wait to see what jake does.

Re: Treats piston port VS MK reed kit, A Review

yeah this thing is nuts, having the bridged transfer opens up a lot more potential.

with that crazy shimming issue, a shim and a countersunk head would be the way to go for sure. i prefer cutting the cylinder down on a lathe, but i know not everyone has that technology.

it would really be ideal to just find the right damn piston, or a better one, something with one ring.

I know a lot of KTM cobra/junior/senior50 shit is very similar to puch, anyone looked into that? If you really are gonna put the beans to this thing you probably ought to have a real nice piston not some generic pot metal taiwan junk.

just guesstimating off that port map, i would say 12k no prob with the exhaust wide like that. whether it can do that running 18/36 gears i'm not so sure, but we shall see. drew human bean would be the one to talk to, he has the sickest AJH athena that i know of, i think he was getting near 70 on it last i heard.

Re: Treats piston port VS MK reed kit, A Review

Charlie BUZZARD Wrote:

-------------------------------------------------------

>

> I can't imagine the allure of this kit other than

> being able to say you got it to work properly,

> lol. Which would be pretty cool I guess.

Bingo. I have more fun experimenting and cobbling stuff together than I do just bolting stuff on and blasting. Theres been a lot of interest in this kit from 1977, but no one has documented their ventures with it.

Re: Treats piston port VS MK reed kit, A Review

12k at 18x40 is like 70. I think its doable. I'll have tons of pics with this next to an Athena in a few hours so just hold tight!

Re: Treats piston port VS MK reed kit, A Review

Intently watching this unfold......

I see lots of potential with this, with the right tools as graham has said.

Re: Treats piston port VS MK reed kit, A Review

I have access to a lathe and mill with all the tooling I could ever want. Just have to figure out how to hold the head when turning it and cylinder when I mill it.

Re: Treats piston port VS MK reed kit, A Review

Cant wait to see the results !!

Re: Treats piston port VS MK reed kit, A Review

Trying to haggle with Mr. Roff right now for a 36t sprocket...

Re: Treats piston port VS MK reed kit, A Review

Re: Treats piston port VS MK reed kit, A Review

This is the piston that solves the problem. Single ring, just needs a boost window cut. Ring gap is straight, still leaves you with 2.7mm of meat up top. Still need to countersink, but no need to do anything else.

Pics:

1977 w/ treats v2 piston bdc intake side, 1977 w/ treats v2 bdc ex side, 1977 w/ treats at tdc

1338937142815.jpg
IMG_20120605_184541.jpg
1338937545371.jpg

Re: Treats piston port VS MK reed kit, A Review

awesome!

holding the cylinder (if you want to do it) can be accomplished by making a simple mandrel. Mine is a big slug of brass and has the business end turned down to the size of the cylinder (slip fit) and there is a countersunk hole in the middle. Band saw cuts segment the one end into 4 sections, by tightening a countersunk screw into the hole in the middle, it wedges the four fingers out and they hold the cylinder. I have one that is stepped 38 and 40mm for doing puch and batavus cylindeers, and one that is straight 45mm, it sucks you have to make one for each cylinder you want to machine, but they work really well.

you can also fixture it in a mill and use a fly cutter, but you better make sure your mill is dead nuts.

all that said, yeah, getting the right piston is probably a much better idea.

Re: Treats piston port VS MK reed kit, A Review

Got my gearing changed to 18x36 but didn't get time to test it out. I'm sure takeoff will be hurt, but I can't wait to see what it does on the top end. Stay tuned for a speed run and video tonight.

Re: Treats piston port VS MK reed kit, A Review

Tuned in and waiting patiently.

Re: Treats piston port VS MK reed kit, A Review

Overpriced Parts /

Me too.

Potential polini killer ?

Re: Treats piston port VS MK reed kit, A Review

My clutch needs tuning. :/

Can anyone say KTM?

Re: Treats piston port VS MK reed kit, A Review

STILL NOT TRANSFER MATCHED and piston issue still hasn't been fixed. Clutch also needs tuning or I need KTM, BUT here's the video.

Held max speed from :55 to 1:20, then showed a kid my GPS and asked him what the max GPS speed was at 2:00. Turn your sound all the way up.

Re: Treats piston port VS MK reed kit, A Review

that is with the porting though?

sounds like you could go down on your gearing, but when you get the piston thing fixed you'll probably have power to pull it.

57 is pretty gnarly either way.

Re: Treats piston port VS MK reed kit, A Review

Nope, not ported, case matched or anything. Just bolted on.

Re: Treats piston port VS MK reed kit, A Review

woaaaahhhhh

you'd be hard pressed to get 57 out of a slap-on gilakit, thats insane.

wish i had a spare puch motor on the shelf waiting for a kit.

Re: Treats piston port VS MK reed kit, A Review

Next step will be ramping the transfers and widening the exhaust. Re-test. Then later on experiment with piston options and countersunk heads.

Re: Treats piston port VS MK reed kit, A Review

At first all I could think about is how the hell are you seeing the road without a bright ass headlight....

This is all impressive so far, thanks for the good work.

Re: Treats piston port VS MK reed kit, A Review

Try 17x36. I feel like you might go faster or have better take off with the same top speed.

Re: Treats piston port VS MK reed kit, A Review

Ok, geared at 17x36 now. Going to ride it to work today and get some miles on it.

Re: Treats piston port VS MK reed kit, A Review

Hell ya, I can't wait for the results.

Re: Treats piston port VS MK reed kit, A Review

nice. if you make the exhaust port all huge like in that port map, you should kill just about anything.

Re: Treats piston port VS MK reed kit, A Review

Ϫ‡☄ಬ∞ ƀƖḬƝƊ ƤǂƿƎ ∞ಬ☄‡Ϫ - Hoke from Black Pipes Moped Gang /

are you running the reeds that came with the kit or some other setup?

thanks

Re: Treats piston port VS MK reed kit, A Review

The stock metal reeds. Some don't trust them, but I think they're fine. My MB5 runs the same metal reeds.

Re: Treats piston port VS MK reed kit, A Review

derbeez ryderz /

Hey graham drew from the human beans had the small reed athena. He took a bunch off the piston skirt and opened the intake a hair. Not sure if he did anything to the exhaust, but it had good low end and tons of revs with the 8p. Towed broke down bikes at 50.

This one looks like it has a lot more potential. It sucks these chinese kits are way off with the ports and the pistons crowns are stupid. I guess you get what you pay for, but this one might really be worth the headaches.

Re: Treats piston port VS MK reed kit, A Review

i raised the exhaust 3mm

also widened 1mm on each side..(i would go wider now)

i took a 25 cent piece and used it as a templet for for the cut out on the piston

mark the piston at TDC

so you know when the piston is at the top of the intake stroke. mark at the top of the intake on the piston.. thats the peak of the arch you want to cut

trying to achieve 360 degree intake duration

it went really fast.. over 65mph

korado cdi

20mm carb

homoet 8p

ktm clutch.

but mostly ran a 3 shoe from the korado.

some really wild case matching

spun over 12500rpm

with that bridged exhaust .. you are going to be able to get wild.. this will be fast (edited)

Want to post in this forum? We'd love to have you join the discussion, but first:

Login or Create Account