Gixxer 750 with a 174 track

[Brett Kobernik]

Well, I started this project intending to use a 950 Superenduro but things change. For numerous reasons which I'll cover during this build, I decided on a GSXR 750. I wanted a 1000cc but found a 750 cheap.

The goal is to see how big we can go with tracks and skis while using appropriate horsepower.

Got lots of parts already. Just sizing things up right now. Hope to test in a month or so if I'm lucky.

 

[Brett Kobernik]

I'm going to ditch the gixxer sub frame and incorporate the seat into the tunnel subframe. Basically, this is what I'll start with

 

[n2otoofast4u]

Interesting

 

[Mtn. Muncher]

You have a interesting project there, I think that you are on the right track by removing the bikes stock subframe and placing the rider on the snow bike kit. I can provide you some good advice if you want it to handle properly. There has been other people who have tried this with no luck. The problem is you cannot manage riding and handling it due to how bulky it will be. The biggest drawback you will have is rider position and transmission functionality. This will be necessary if you want to comfortably ride it on anything but flat ground. For proper handling the rider will need to sit at least 16 inches further back than a normal snow bike. You also will want CV clutching or you will not be able to utilize the power of that engine.

Allen from Timbersled.

 

[tomk]

You have a interesting project there, I think that you are on the right track by removing the bikes stock subframe and placing the rider on the snow bike kit. I can provide you some good advice if you want it to handle properly. There has been other people who have tried this with no luck. The problem is you cannot manage riding and handling it due to how bulky it will be. The biggest drawback you will have is rider position and transmission functionality. This will be necessary if you want to comfortably ride it on anything but flat ground. For proper handling the rider will need to sit at least 16 inches further back than a normal snow bike. You also will want CV clutching or you will not be able to utilize the power of that engine.

Allen from Timbersled.

Holy S! I hope this is a little bit of a teaser on what is to come in the future from Timbersled!!! How else would a guy know so much about this topic

Awesome build Brett, I cant wait to see the final results!

 

[rottinjonny]

A 24" wide ski seems appropriate... Lol

 

[Brett Kobernik]

Thanks Allen, already have been thinking about rider position a bit. I have a few other ideas that may be beneficial for this type of project. Keep in touch.

 

[M5-]

That thing is going to be huge. You might want to nickname it "Project Mother Ship". We've used that name before (174 turbo Apex) but in this case it may be appropriate. LOL

Keep the pics coming.

M5

 

[tedesweden]

I BUILDT ON LAST YEAR ON A 2003 GSXR 750 WITH MY OWN INVENTED TEDESLED KIT

 

[Brett Kobernik]

You Swedes are nuts!! I like your style. I think I've seen a video of that machine on the flats. How does it do in the hills?

 

[Brett Kobernik]

Slowly making some progress. The gixxer is running nice after a fuel pump and one injector cleaned. Just starting to line things up now.

 

[n16ht5]

Move the motor back 12" at least. get on top of the track, not levered out way in front

 

[Brett Kobernik]

Started to fit the YZ forks. Looks like they will go on without too much custom work. The lower bearing of the YZ has an ID of 30mm, same as the Gixxer, so I'll use the Gixxer bearing. The YZ stem is a bit longer than the Gixxer's so I put a spacer under the inner race before I put it on the YZ steering stem.

The upper bearing on the YZ has an ID of 28mm. The Gixxer uses a 30mm ID and a 55mm OD. I have not been able to find a bearing with a 28mm ID and 55mm OD. That is what's needed to finish the triple clamp swap. So, I know some folks who can make me a 28mm ID X 30mm OD sleeve that I'll press onto the YZ steering stem which will then accept the Gixxer upper bearing.

 

[Mofood]

Kowneering!

 

[Brett Kobernik]

 

[Brett Kobernik]

Making a little more progress. Ultimately, I want to be able to climb a few hills with this thing as well as be able to traverse around in deep snow. When engineering something like this I find myself getting bogged down with theories and ideas. So many options. Sometimes you just gotta make a move.

My Papa always says 'easy things first' so I'm following that philosophy. I'm going to let this thing come together 'organically', test it, and then make adjustments and refinements over the summer.

Rider position was a choice that I was struggling with but following my Papa's rule, I'm going with a fairly standard motorcycle position. It's the easiest. I think Mountain Muncher has valid points on getting the rider farther back but I'm not going to have time to make that happen AND test this thing this season. Plus I gotta see for myself how poor the thing handles in the standard position.

Fabricated some crude foot pegs today.


This is not what you call 'precision machining'. It's scrap steel from my garage but will work for testing purposes. I usually ride in ski boots or snowboard boots and have skis or snowboard along. I've been thinking about a forked shift lever so I thought why not give it a go.

 

[Brett Kobernik]

Looks like it's time to start on the sub frame and tunnel next. I'm going to leave a lot of room for future tweaks. Two things that have become obvious potential future considerations are:

• Ditch the stock fuel tank and fabricate one to mount on the tunnel
• Ditch the radiator and use a heat exchanger on the tunnel

Both these will shift quite a bit of weight toward the rear of the machine.

 

[Brett Kobernik]

A lot of people are shaking their heads at this build but I'm getting a good vibe off it. Got a good start on the spindle. I'm using my Timbersled ski plus custom oversized tray. I've used this on my 570 for a year now. I figure using the same ski that I already use will be a great test on this beast.

 

[Brett Kobernik]

Putting dirt bike forks on the GSXR street bike makes for an easy spindle configuration. The longer YZ dirt forks eliminate a tall spindle. The ski sits only a few inches away from the YZ axle. The spindle in the photo still needs some drilling and welding. It's just bolted into position for rough fitting right now. I'm using very low tech mild carbon steel for prototyping because I have it and it's cheap and easy to prototype with. IF this ride works, I'll go to all aluminum over the summer.

 

[Brett Kobernik]

While engineering this, I'm trying to make room for lots of adjustment in geometry. I want to be able to ride it and make adjustments in the feild while testing. I've built in adjustable 'trail' to the spindle. A few trials should tell what position is best for what I want. All I need to do is pull out the two gold bolts and move the mount back to the desired holes to tweak the 'trail'.