Updated porting temp plate

[waxhead]

Updated Porting Template – Now with Transfer Heights!​

We've updated the porting template to now include transfer heights when you print it out, making the process even easier.

Will this instantly turn your engine into a full race ski? No, that’s not the goal of this template. But if you're looking for a race-spec version, let me know—I’ll create one and make it available here.

For now, you can download the updated template for free from our website—this is our way of giving back and thanking you for your support over the years.

An 81mm version is also in the works and will be available soon, so stay tuned!

Porting Made Simple. Precision Made Easy. ​

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Exhaust Port template

Below are downloadable files from Wax Racing, offering traceable templates for 3D-printable exhaust ports. To access a file, simply click on the desired link, and a download window will open. Make sure to download the file specific to your ski and engine configuration. For example, if you are...

www.waxracingproducts.com

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[waxhead]

Here’s an engine I’m building for the upcoming race. Running 196° exhaust timing, 70% bore width exhaust, and 130° transfers, aiming for a smooth powerband that pulls strong without being too aggressive. Expecting it to rev in the 7400-7600 range, which should be just right.

It’s more of a rec-race port job, so it won’t hit super hard off the bottom, but it should still make solid power and keep pulling up top. For freeride, the higher transfer timing might soften the hit a little, but that’ll depend on the full setup. Overall, I expect it to be a smooth, rev-happy engine that just wants to keep going.

We’ll see how it runs once it’s in the water—I’ll report back!

Exhaust Port template

Below are downloadable files from Wax Racing, offering traceable templates for 3D-printable exhaust ports. To access a file, simply click on the desired link, and a download window will open. Make sure to download the file specific to your ski and engine configuration. For example, if you are...

www.waxracingproducts.com

 

[dwendel]

I need to print one and check it out.
Ready for the that kawi version.

 

[Toshbar]

Thanks for sharing.

 

[yamanube]

These are cool, nice work.

 

[mikidymac]

Hello @waxhead. Any updates on the 81mm templates?

 

[waxhead]

yup we have a 81 with 195exhaust and 126 transfers one up there. 65% bore width. This is an awesome port spec and I have used it for years

Exhaust Port template

Below are downloadable files from Wax Racing, offering traceable templates for 3D-printable exhaust ports. To access a file, simply click on the desired link, and a download window will open. Make sure to download the file specific to your ski and engine configuration. For example, if you are...

www.waxracingproducts.com

 

[mikidymac]

Thank you Wax.

 

[mikidymac]

Wax, these are great! Thank you again for keeping the sport alive and releasing great new products.

 

[waxhead]

your welcome. JUst trying to make it easier and cheaper

 

[Myself]

I'm a simpleton.......in the back woods of Arkansas with no way of 3D printing available. Heck, I don't even own a cell phone! Got any drawings or port maps I can print out all old school like..........on paper LOL!!

 

[waxhead]

haha
get a printer

 

[mn_reeds]

Assuming these are all for 62T cylinders? I grabbed the "81mm bore 195 exhaust 65% Bore with 126 transfers", printed it out, and bolted it in for fun tonight.

On my stock 61x cylinder the exhaust port was off fairly significantly, as were the transfers. I compared it with my yamanube template and that pretty much confirmed the suspicion.

The top of the exhaust port would be raised ~4.8mm:


The bottom of the exhaust port on the template is roughly 3.5mm above the stock exhaust exit:


And the transfers would need to be raised roughly between 1.8mm to 2.4mm depending on which exhaust/aux port was measured:



Having never run a 62t I wasn't aware that the differences were that significant for an 81mm cylinder.

@waxhead - would it be feasible to just drop the exhaust port 3.5mm and leave the transfers alone for the 61x?

 

[waxhead]

You could drop it if you really wanted, but keep in mind these porting templates are designed to help your engine make real power — not just for a light clean-up.


If you’re only planning a mild clean-up on a 61x, honestly, don’t bother. Instead, focus on tightening up the squish and bumping the compression. You’re correct about needing to raise it 4.8 mm to get any real power out of it — and it also needs widening, because the blowdown port time-area on the 61X is an absolute disaster.

The stock 61X cylinder is a poor starting point anyway — you’re far better off using a 62T. The 61X runs 118° transfers and a 179° exhaust, which is a terrible setup for making power. Cleaning it up is like polishing a turd: it might look shiny, but that’s all it’ll be.

 

[kevbo]

Low ports will limit power but they are the most responsive. I have found the throttle response gets slow unless you want to set compression and ignition timing for high octane fuel.

 

[mn_reeds]

Unfortunately for now I'm stuck with this 61x and was looking to go more aggressive than the previous templates that I have run.

I've been following the other thread on "How to Turn Your 701 62T Into a Real Mini Weapon". Would you be open to a parallel thread on "How to get second place with your 61x"? Second place is also fine since I'm not racing and just throttle blipping around.

Outside of the actual 62t I have everything else on hand:
- ADA head with domes that should put me at 195 psi (squish will be too high at 1.27mm based on notes)
- 4 hole sbn 44s because i got them on a package deal, vforce reeds
- zeel with the wax v3 curve on it
- mod b-pipe

Thoughts:
- ideally deck the cylinder .4mm to fix squish - thicker base gasket?

Porting:
- Widen exhaust to 65-70% - raise height xx mm
- Raise transfers xx mm
- Raise sleeve height 8mm?
- Widen/taper boost port tunnel

 

[waxhead]

Low ports will limit power but they are the most responsive. I have found the throttle response gets slow unless you want to set compression and ignition timing for high octane fuel.

Whe can disagree on that one. We agree on a lot of other things

 

[waxhead]

Unfortunately for now I'm stuck with this 61x and was looking to go more aggressive than the previous templates that I have run.

I've been following the other thread on "How to Turn Your 701 62T Into a Real Mini Weapon". Would you be open to a parallel thread on "How to get second place with your 61x"? Second place is also fine since I'm not racing and just throttle blipping around.

Outside of the actual 62t I have everything else on hand:
- ADA head with domes that should put me at 195 psi (squish will be too high at 1.27mm based on notes)
- 4 hole sbn 44s because i got them on a package deal, vforce reeds
- zeel with the wax v3 curve on it
- mod b-pipe

Thoughts:
- ideally deck the cylinder .4mm to fix squish - thicker base gasket?

Porting:
- Widen exhaust to 65-70% - raise height xx mm
- Raise transfers xx mm
- Raise sleeve height 8mm?
- Widen/taper boost port tunnel

I could do that, but the reality is these engines are very similar and will end up tuning much the same. Personally, if you want to widen the exhaust port, you’re far better off starting with a 62T cylinder — it will bolt straight on, and you can sell your 61X.

Another issue I see with your setup is the mod chamber. Get rid of it. Either run a limited/factory pipe chamber or one of our own chambers. From what I’ve seen, in terms of stock-style straight chambers ranked from least to most power, it goes like this: 650 Yamaha → 701 mod → 700 limited → 701 FX1.

And before anyone asks, no, I haven’t dynoed them — but I’ve been racing skis since 1993, built a lot of engines, and seen firsthand how different chambers perform on different skis.

Yes, drop the squish, but be aware your 33 cc domes will probably push compression too high, so you’ll need to change domes. You’ll also need a thinner base gasket — the stock one squashes to about 0.5–0.6 mm, so you should go down to around 0.2 mm.

The 61X transfers are a mess, and it takes a huge amount of work to get them to run anywhere near as well as a stock 62T.

 

[kevbo]

One other thing to consider about port height is your exhaust system. Once you go higher than stock 61x timing you also need a working tuned pipe or else you are trading torque for RPM. . A good pipe will boost a low port cyl but they get maximum boost with a little higher ports. You may notice wet pipes have a difficult time beyond the lower 7000 rpm range. Dry pipes can turn more RPM. Racing outboards have no pipe and are spinning over 8000 rpm with 175 degree exhausts.

 

[waxhead]

Racing outboards run 175° ports with no pipe — the pulse-tuned system keeps flow moving past 8000 rpm without needing a reflected wave not as good as a chamber but really only works on a triple configuration. v6 are the same as they are two triples. Wet pipes below 7000 rpm ? Did you mean dry pipes