PW80 Cylinder and Piston on Tri Zinger YT60

[xlxrman]

Looking for a little more power out of the little zinger. Has anyone put a PW/BW80 cylinder and piston on these? Will it fit? If not, what are some of the other mods people to to get more power out of them? Thanks

[dcreel]

I don't know, but I'd be interested to hear if anyone has done this..

[Dirtcrasher]

I hope it is possible.....

I feel bad for FOX, he's been looking for a good cylinder for a long time now!

[dcreel]

I hope it is possible.....

I feel bad for FOX, he's been looking for a good cylinder for a long time now!

I've got 2 or 3 used cylinders.. I don't know if they are any good.. How would I check?

[xlxrman]

I am going to try and find one and see if it will fit.

[tecat-z]

I believe a E-ton 70 cyl is the closest. Plus, some of their pistons can be used as oversize in oem tri-zinger cyl. I had all of the 'interchange info' it one point from my yamaha friend who was big into this stuff 7-8 years ago. There are options, and i'll try and get this figured out at some point.

[thefox]

What are the options?

So far I am trying to get some bigger pistons out of the UK and I have heard the Honda Express oversized pistons may work as well. I have 2 junk cylinders here and another one that may be usable on the way.

I have not tried the PW80 cylinder just because I have not heard of anyone beeing able to use it yet.

Were these coated from the factory?

[cr480r]

I am not very familiar with these engines, But I would like to suggest buying a base gasket for the PW before spending the money on a jug.. you can then use the base gasket to determine if the cylinder studs are in the proper location... do the engines have the same stroke?

[dcreel]

Good idea..

[Vealmonkey]

If you want to put a larger cylinder on a zinger, you have to do pretty much what greenhuman does to the 200x cylinders. You need to build up the cases with welds, then you need to redrill your cases for new studs in a different location and then you need to machine out where the bottom of you cylinder fits into the cases. Without doing this, well, it's just alot of work for very little return.

[xlxrman]

Few more questions. I want to block off the pre mix stuff and mix my own gas. What all is required? What kind of throttle cable do I use?

What is the STD bore on the Zinger? Thanks

[Racerguy381]

I have a friend that has a PW50 with the PW80 cylinder on it. When I see him I will ask what it takes to do the swap. Not to familure with the Zinger so I dont know how close the engines are. Anybody on here know how different they are?

[Thorpe]

Few more questions. I want to block off the pre mix stuff and mix my own gas. What all is required? What kind of throttle cable do I use?

What is the STD bore on the Zinger? Thanks

Its pretty easy to block off... I took the pump all the way apart, used a small rubber washed on a tight fitting bolt with a steel locknut, and then tack welded the nut to the bolt, and sealed for extra protection (from the outside) with epoxy... Using the stock cable still, without issue. (just removed the injection cable)

[Vealmonkey]

You can buy all the stuff, cable housing, cable, and ends from Dr. ATV and then you have to custom cut and make your cable to size is the easiest way. There may be a motorcycle cable that fits, but I checked 20 or so cables and never found one myself. It was easier for me to cut and assemble my own.

[xlxrman]

I've heard of a lot of people bolting on the YT60 cylinder to the PW50, so if the PW80 cyl. fits on the 50, it should fit on the zinger.

[Racerguy381]

I will ask him, I know there are some older Yamaha's that the cylinder head works as a great starting point for head mods. The head doesnt have the angled spark plug hole so you can turn them easily. You might try a Moto 4 cable it my be the right length.

[69HemiGTX]

The stroke of the PW50 and YT60 are the same, while their bores differ (40 x 39.2 and 44 x 39.2, respectfully). The bore and stroke of the PW80 are 47 x 45.6, so if the cylinder will fit, the combo will net you a 68cc engine. I hope you weren't thinking it would be an 80. I sure wish that was the result! I have an 84 PW50 I'd like to mod with this if possible. :naughty:

[Racerguy381]

Looks just like his lol same yellow 84 PW. I wish I could find some of the old PW mod parts. Do you remember back in the day PAX racing and a few other companies had ooodles of performace parts for the PW's. There where big bore cylinders pipes carb kits extended swingarms forks frames you name it. Try finding that stuff now is about as hard as finding Tiger or Cagiva parts lol.

[Racerguy381]

Ok so heres the deal, I talked with my buddy today and got the info on this swap... The swap will not just bolt on unless you want to bolt the whole PW80 engine in the Zinger chassis. From what he told me the piston pin on the 80 is bigger than the 50 plus the rod length is longer on the 80 which makes the cylinder taller. On his he bored the stock 50 cylinder out to fit the 80 piston but that still isnt a direct swap. He has to machine out the rod to fit the piston pin which isnt running a bearing anymore, its just graphite coated so its not running metal to metal. Unless you want to weld up your cases do some machine work and relocate your studs at that point you can graph on a mini quad cylinder. He did this for a customer and ended up with a big carb and pipe got 12hp out of it. The mini quad cylinders are alot better starting point for the port layout than the OE yamaha. Hope that all this info is helpful to you guys.

[86trizinger]

you can find used ported MIni quad cylinders cheap. Some of the people that race them only run a few races sometimes.

As far as pistons goes.. Couldn't you just order a custom piston from somewhere online? I used to build watercooled VW's with custom piston and all you needed were the specs of what you want. It would take a few weeks . It cost around 400-500 for a set of 4 pistons. Just a thought though.

Wish I had a trizinger still. I sold mine on here about a year or 2 and it was in great shape.

[Racerguy381]

Ya you could have custom pistons made by Wiseco, it takes a run of 12 to place an order. I had a deal with Bahn Brenner to have custom pistons for my Turbo 16v made a few years back so I know Wiseco will do it. They make all of the big bore pistons for ESR and RPM among a few names out there. Here is the custom order form, you will need to measure pin to deck height pin diameter and overall piston size.

http://www.wiseco.com/Catalogs/Powersports/CustomOrderPowersports.pdf

[jeddy]

On the oil pump, I just removed the plastic gear that drives the pump on the inside of the motor. This way you still have the pump in place to plug the hole in the case and you can use the standard throttle cable. The gear is plastic, so you can just cut it off with a good pair of dykes and you don't have to remove anything (but obviously the gear will then be destroyed) other than the side cover. The pump, at least on the PW50 I was working on, had a spring on it that I needed to get the throttle to return. Then just put a cap over the oil inlet on the carb (I used a cut off piece of the oil line since it's so small and put a small bolt with sealant in it).