Got The Holeshot
Arm chair racerJust too addicted
My PK 70 needs a heart. I Refuse to put a Lifan etc. In it! So, should I go with the trail bikes high end 88 kit? Comes with head and all that. Or will I see epic results with the stroker kit? I intend on on splitting the lower end no matter what path I take. I just want to retain as much old school, original coolness of this trike.
So, who's done it and how was it??!
Power User
Roostin Away
If it were mine.....I'd have to go with the 108 Stroker motor. Good for you for not wanting to use one of the Chinese motors.
* 1978 ATC 90/180 Pauter PJ1 / Springer "Team BAPP" Bike *
* 1980 ATC 110/180 "Danny's Machine Works" 3D Sprint Dune Bike *
* Nicholson 500 Race Bike *
* HPATC Yamaha RD350 "Big Moe" Trike *
Got The Holeshot
Arm chair racerJust too addicted
Yea, that's all the atc 70 fb page people do. China China China engines, and stretched frame. �� I really wish I could get the same performance out of a re worked stock piece at a reasonable price. I'm a sucker for a period type build.
First Time Rider
Arm chair racerNew to the board
I put a piranha 140 in my 84 and it is an animal. Ive barely ridden the thing and it wheelies in every gear. I did it for the manual clutch. The guy to talk to is Gordon Spangler on fb, he can hook you up with any kit you want and it will all be correct, along with a custom exhaust that is less restrictive than the stock exhaust. His website is www.hondaatc70com. Thats where I got most of my parts and is a great guy to deal with.
Trikes Owned:
1983 Honda 200x - Durablue Axle
1986 Honda 250r - +2 westcoast
1984 Honda ATC 70 - Piranha 140 swap
1983 Honda 200e - Stepdads
Got The Holeshot
Arm chair racerJust too addicted
Yea. No piranha. No China motors. In in for a stroke!
Power User
Got the holeshot
I was really happy with the $100 88cc kit I got from DRATV on my TRX70. I used the stock head, carb, pipe, etc. Really woke up a tired engine.
Power User
Got the holeshot
That-a-boy! Old school race parts will always be worth more and have the coolness factor (even though I think these kits are all new repops). Plus you don't have to worry about something not fitting, mounts, exhaust, a kickstart, etc. And you still have that Honda reliability. Only real reason I'd want a Chinese motor is for the manual clutch.Originally Posted by 90nut
You plan on upgrading to a CDI? Some people say it's great, some people don't have luck with them (my one friend being one of them).
Power User
Roostin Away
You can do a manual clutch with a ct/sl 70 side case and basket and primary gears. Like any h/p upgrade it all comes down to what you want to spend and how much time you want to take in building it. I have a old Honda 70 motor that I put a custom sleeve in and a 110 big bore piston in with a ported sl head and old Honda race cam and a 200x carb and a button style rm ignition. It came out to 90cc and runs really good it don't have to torque of a stroker motor but it will hold its own with the bigger motor on top end. If I had it to do over again I would stroke it with the big bore.
If its on the internet its got to be true they can't put any lie's on the internet
Power User
Got the holeshot
The ct and sl 70/90 cases and engine usually go for as much as a whole bike and are hard to find for the same reason we want one. If I could find one I'd do the sub trans delete on my 110 and do the conversion. But if you are lucky enough to find one cheap, snatch it up while you can.
Power User
Roostin Away
I'm almost positive the 90's are different than the 70's.
First Time Rider
Arm chair racerNew to the board
Definately go for the 108cc stroker if you are going to tear into the motor anyway. The 88cc is not all that impressive for adults to ride on and will leave you wanting more quickly. Plus who knows how many miles are on that stock crank and bearings as these motors are over 30 yrs old. Would be wise to freshen up the bottom end with a nice stroker crank before running it hard like you will with the increased power.
1985 ATC 350X all original/OEM Honda parts
1972 US90 Dickson Designs 2" stretched tube chassis, 200x Forks, Piranha 150cc, VM26
1985 ATC70 Piranha 114cc BBK, Ported Race Head, TB300 Cam, Spangler's Exhaust
1985 ATC70 Piranha 150cc, VM26, Z40 cam, Ported head, Two Brothers Exhaust, 2" stretch
1970 Honda CT70125cc Mikuni 24, XR80 Forks, Aluminum Swingarm, Carbon Exhaust
1972 Honda CT70110cc e-start, Mikuni 20 carb, Carbon Exhaust, Aluminum Wheels
1993 Honda Z50R all original
Got The Holeshot
Arm chair racerJust too addicted
Yea, I wouldn't go to the effort of putting that nice new too end on a 30 yr old crank and bearings, I was just fishing for anyone that has actually ran one. I had an 88 kit, just the bigger bore, stock head etc, it was ok on my crf50 but the atc 70 has a bit more rolling resistance.
At The Back Of The Pack
Arm chair racerFirst time rider
The other non-chinese option is a TRX90 engine. I have one converted to a full proper manual clutch with a 49.5 China crank and 52mm "race head" top end, and its brutally quick for what it is. The downside is the amount of Chinese pieces I needed to do the manual clutch conversion and the longer motor took some wiggling to fit it in my pit quad. Sometimes the motors are cheap, sometimes not.
But if you want to go off your cases, pony up for the 108 and put an HD clutch in it. My dad's 81 CT70 really woke up with a stock head 108 kit.
At The Back Of The Pack
Arm chair racerAt the back of the pack
Glad to see someone doesn't just throw a cheap Chinese motor in there trike. Good for you.
Power User
Roostin Away
Go big or go home ?
I just wanna go fast. If your not first, your last!!
Reproducing the Tecate CDI. Contact me if you need one. I'm most accessible on FaceBook. You can find me on the 1984-1987 Kawasaki Tecate KXT250 Group.
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