200cc Gio Beast Winter=Death???? - Page 3

waynev · 01-07-2010, 09:39 PM

Well now that we all agree that colder temps need more fuel, (sorry if i offended anyone with my last posts) then it seems that a larger pilot jet will allow more fuel to flow and will aid starting in cold weather.
I've never had to use any extra heat to start my snowmobile in the last 30 years, but if you look at the choke system in a snowmobile carb you will see it's much better than just a butterfly plate, when you pull the choke on a sled it opens up a passage that lets lots of fuel in on the engine side of the throttle slide, this extra fuel helps with cold starting and explains why going to a larger pilot on my beast allows more fuel which inturn means my beast now starts as good as it does in warmer weather.

Ok time to get these Beast logo's finished and get some envelopes and mail them off. I hope in my rantings you have read thru that mikuni tuning guide and have learned something about jetting ( for those of you who didn't know much about that topic ).

It's snowing like crazy here tonight, i might have to go sledding this weekend instead of some beast time.

Reveeen · 01-08-2010, 08:25 AM

It's snowing like crazy here tonight

You keep that snow right there where it's needed!

Something that has not been explored is the variety of needles (different tapers) for mikuni carbs.

Another thing to explore is the spigot vs flange mount. You can get some carb heating through the flange, but the spigot mount isolates the carb from engine heat.

If you keep an eye on the "dew point", many times it matches ambient temperature, and you can get a feel for carb icing. I regularly encounter carb icing here on my scooter between 35F and 45F.

01-07-2010, 09:39 PM	#31
waynev Join Date: Aug 2009 Location: London, Ontario Posts: 1,097	Well now that we all agree that colder temps need more fuel, (sorry if i offended anyone with my last posts) then it seems that a larger pilot jet will allow more fuel to flow and will aid starting in cold weather. I've never had to use any extra heat to start my snowmobile in the last 30 years, but if you look at the choke system in a snowmobile carb you will see it's much better than just a butterfly plate, when you pull the choke on a sled it opens up a passage that lets lots of fuel in on the engine side of the throttle slide, this extra fuel helps with cold starting and explains why going to a larger pilot on my beast allows more fuel which inturn means my beast now starts as good as it does in warmer weather. Ok time to get these Beast logo's finished and get some envelopes and mail them off. I hope in my rantings you have read thru that mikuni tuning guide and have learned something about jetting ( for those of you who didn't know much about that topic ). It's snowing like crazy here tonight, i might have to go sledding this weekend instead of some beast time.
	0

01-08-2010, 08:25 AM	#32
Reveeen Join Date: Jun 2009 Location: orbital platform Posts: 741	It's snowing like crazy here tonight You keep that snow right there where it's needed! Something that has not been explored is the variety of needles (different tapers) for mikuni carbs. Another thing to explore is the spigot vs flange mount. You can get some carb heating through the flange, but the spigot mount isolates the carb from engine heat. If you keep an eye on the "dew point", many times it matches ambient temperature, and you can get a feel for carb icing. I regularly encounter carb icing here on my scooter between 35F and 45F.
	0