Awesome, thanks for the response. What is so wrong with starting with a 62t cylinder in most peoples minds and porting it? What do you gain/lose? I was under the impression the 62t is more mid/top while the 61x was more low/mid. I am a rec rider for now however I want to keep my options open when I build the motor.
I know I want more power out of the ski and the next step is displacement and porting. Currently its a 62t/61x, ada head @170, Coffman sizzler, Concord big hub 9/15, worx 205. I feel like it needs a bit more midrange brapp and at least as much bottom end as I currently have, more top end would be nice but not what im after.
I have more time than money so I dont mind trying to port it myself. My local shop will bore the cylinders for 80 a hole and that seems fair. I guess my question is would I be better off using my 61x cylinder and porting that or the beefier raider 62t cylinder that has more cylinder wall?
Thanks for your help.
I think the 61x vs 62t cylinder debate has kind of died off in the past few years as everybody has come to the realization that neither option is really a true FREESTYLE setup as it was once considered and most people that have dedicated freestyle machines are using aftermarket cylinders and/or stroker cranks. Really what most people want/need (at least most people who are porting their own cylinder) is an overall increase in performance and likely spend most of their time in the "midrange". Most people aren't doing off-idle tricks with stock cylinder engines so where the 61x cylinder feels quite snappy down low, it starts to sign off up top and the 62t cylinder really runs pretty well throughout. The 62T cylinder also has better transfer and boost port matching from the factory which is a big plus for the DIY person that doesn't have the tools or knowledge to modify their transfer ports. If you ride a superjet or a blaster, you aren't flatwater flipping and generally you are jumping and riding and spend a lot of time on plane. If you have an aftermarket, light hull, the slight loss in low end power you might see with the 62T cylinder is negated by the lower overall weight.
The honest truth is you are likely being held back by the Sizzler exhaust, porting either cylinder will make a noticeable difference, adding a better exhaust system to it will be better still.
This is all just my two cents, I am not a professional engine builder or any kind of two stroke guru. Just a DIY and tuning enthusiast that has put in some time researching, reading, studying other peoples work and took all of that info and designed my templates around it. These where 100% drawn by me, not traced, not modified from, drawn by me in AutoCAD, tested on my own setups and then released here. So far I have only had positive feedback, but am 100% open to all feedback and encourage it (positive or negative).
This is for yamanube or anyone that has used his 701 port templates. What do you do to finish up after I did the cutting in the transfer? Do I file it to a taper or just leave as is or what is the finishing step? Photos would be best, here is where I am at now.
