dont know where to begin

[slamjam434]

So to start off, im a full time welder and love to tinker with motors and fix cars so its obvious why i got this idea in my head. So i bought a 399cc bombardier rotax enine and im basing my frame design off that. Im curious as to all the parts im going to need. So far just off my head i can think of the obvious. Shocks, tires, some kind of axels. What else because i know theres so much more than just a couple little things.

 

[rushking19]

So to start off, im a full time welder and love to tinker with motors and fix cars so its obvious why i got this idea in my head. So i bought a 399cc bombardier rotax enine and im basing my frame design off that. Im curious as to all the parts im going to need. So far just off my head i can think of the obvious. Shocks, tires, some kind of axels. What else because i know theres so much more than just a couple little things.

Welcome to the form, i also own a rotax 399cc bombardier engine that Im puting on an engine, a few other things to remember is to, make sure the engine is sitting in a place were its getting tons of air, and tuned for the warm weather, so it doesn't over heat
Also you need to find a secondary clutch to make some sort of drive train, to connect the engine to the tires, and other than that, just maybe making a custom exhaust system, and minor welding, and wiring and that's it, and you should buy a air filter for the engine since it's not in snow anymore .good luck on your project
And please upload pictures if you have some of what you have going so far

And if you can please upload a video of the engine running open header.or just running

 

[Desertduler]

And also take note that a diaphragm type snowmobile carburetor is not sealed against dirt even with a air filter installed on it. Dirt and dust WILL enter then engine through the throttle and choke shafts. If indeed the engine has a slide type carburetor like a Mikuni VM or TM series carburetor or Keihin PE,PWK or PWM series carb then you are good to install a Foam air filter and use foam filter oil on the air filter for off road use. Do not buy into the gauze filter craze that some people think keep dirt and dust out of the engine because they do not!

 

[rushking19]

And also take note that a diaphragm type snowmobile carburetor is not sealed against dirt even with a air filter installed on it. Dirt and dust WILL enter then engine through the throttle and choke shafts.

I forgot about that, I remember you mentioning something about that one time

 

[Desertduler]

I forgot about that, I remember you mentioning something about that one time

Indeed!

 

[rushking19]

Indeed!

i don't think I'll have to do that to mine because mine will be mostly a on road go kart

 

[Desertduler]

i don't think I'll have to do that to mine because mine will be mostly a on road go kart

It depends on how dusty the surface is for sure and I am totally against gauze filters because I have seen many engines with what I call screen door filters dusted out from dirt ingestion from using them and it depends to me how much you care about your engine. If you want to conduct a real good experiment then take a shop vacuum and clean it out real good and remove the filter from it and then take a treated gauze type filter without pointing at one certain brand and adapt it to the vacuum inlet on the vacuum and turn the vacuum on and take some flour and let the gauze filter suck the flour out of you hand and then watch the exhaust of the shop vacuum expel some of the flour out from it.

 

[rushking19]

It depends on how dusty the surface is for sure and I am totally against gauze filters because I have seen many engines with what I call screen door filters dusted out from dirt ingestion from using them and it depends to me how much you care about your engine. If you want to conduct a real good experiment then take a shop vacuum and clean it out real good and remove the filter from it and then take a treated gauze type filter without pointing at one certain brand and adapt it to the vacuum inlet on the vacuum and turn the vacuum on and take some flour and let the gauze filter suck the flour out of you hand and then watch the exhaust of the shop vacuum expel some of the flour out from it.

My carb is a tillotson HR diaphram carburater ,and my area isn't that dusty so I don't think it's a problem, because the road are very clean ,and I'll be checking on the carb so if it happens I'll, seal it

 

[Desertduler]

My carb is a tillotson HR diaphram carburater ,and my area isn't that dusty so I don't think it's a problem, because the road are very clean ,and I'll be checking on the carb so if it happens I'll, seal it

You can indeed seal the shafts, I have before.

 

[rushking19]

You can indeed seal the shafts, I have before.

I know but I will not do it unless it becomes a major problem

 

[Badot]

Do not buy into the gauze filter craze that some people think keep dirt and dust out of the engine because they do not!

Gauze filters are fine. Both gauze and foam have similar filtering abilities provided you get a decent quality filter. They both work on the exact same principle.

 

[Desertduler]

Gauze filters are fine. Both gauze and foam have similar filtering abilities provided you get a decent quality filter. They both work on the exact same principle.

Oh, Ok thanks.

 

[rushking19]

Oh, Ok thanks.

Yep thanks the one I plan on getting, if would work perfectly for my conditions

 

[Desertduler]

I just learned something after racing off road for 30 years.

 

[rushking19]

So to start off, im a full time welder and love to tinker with motors and fix cars so its obvious why i got this idea in my head. So i bought a 399cc bombardier rotax enine and im basing my frame design off that. Im curious as to all the parts im going to need. So far just off my head i can think of the obvious. Shocks, tires, some kind of axels. What else because i know theres so much more than just a couple little things.

Did you ever open up the heads to check the condition of pistons ?

 

[Denny]

Don't feel bad Desert it took me 40 years to learn gauze type filters are as good as normal filters. I guess all those engines I opened up with sand and dirt in the intake and ports were just an illusion.

Denny

 

[Desertduler]

Don't feel bad Desert it took me 40 years to learn gauze type filters are as good as normal filters. I guess all those engines I opened up with sand and dirt in the intake and ports were just an illusion.

Denny

At least someone knows what they are talking about! Thanks Denny, you have been there done that too. After 40 years of being a mechanic and racing off road for 30 years I learned a long time ago how good they are indeed.

 

[firemanjim]

Gauze filters are for cheap engines, run only on the street/track. They do not keep out the tiny micron dust that eventually eats your engine. Realistically, they are only for looks......
I run one on my Honda gx160, but it's only driven on the streets of my neighborhood. No dirt or major dust to contend with. Just blacktop..... Still, I SHOULD be running a quality filter.....

 

[Desertduler]

Gauze filters are for cheap engines, run only on the street/track. They do not keep out the tiny micron dust that eventually eats your engine. Realistically, they are only for looks......
I run one on my Honda gx160, but it's only driven on the streets of my neighborhood. No dirt or major dust to contend with. Just blacktop..... Still, I SHOULD be running a quality filter.....

Absolutely Jim!

 

[Badot]

If you guys are trying to convince me otherwise, link up some objective tests rather than anecdotes. Best I've been able to find is here -- not particularly scientific though: http://www.bobistheoilguy.com/air-filter-filtration-test/