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erectordale
05-12-2006, 10:01 PM
the Tiger 500 I'm working on has been run with alky. I was wondering with the mods that are made for the alky will it run on pump gas with rejettingor a differant carb all together :wondering
WIkid500
05-13-2006, 12:11 AM
probably different seals in the carb. the jet sizes have been raised from stock. because you need more alcahol to run compaired to gas. and mabee a high compression piston.
Billy Golightly
05-13-2006, 12:16 AM
Probably had a fuel pump and an enlarged carb bowl for the alcohol. Jetting as mentioned would be different and probably the needle/seat setup too. Maybe even the float. Not sure what methanol does to plastic? :wondering
atcsteve
05-13-2006, 09:30 AM
Save yourself some trouble,and get a new carb.The jets are either drilled out or way too big for pump gas.Also check your crank bearings cause people who dont purge the system,tend to have rust down deep!
WIkid500
05-13-2006, 10:00 AM
Save yourself some trouble,and get a new carb.The jets are either drilled out or way too big for pump gas.Also check your crank bearings cause people who dont purge the system,tend to have rust down deep!



humm did not know that about the rust. but I guess it makes sense, cause alcahol attracts water. just something I never thought of.
erectordale
05-13-2006, 06:53 PM
thats what I thought I still have the set up if I want too use it but will use the stock carb I have and stock cylinder
nate b
05-13-2006, 07:59 PM
Your probably gonna have to run high octane fuel, because if it was running alcohol it probably has some pretty high compression.
KASEY
05-13-2006, 09:39 PM
and mabee a high compression piston.


actually we are talking about a 2 stroke,,, no such thing as a high compression piston for one :eek:


trying to use a carb for both is way to much work ,,, it would be alot easier on your brain to get another carb,
erectordale
05-13-2006, 09:43 PM
well with the latest ebay bargain I got I have 7 bing 55 carbs 2 stock not moddded and 3 allky 1 thats a mixed up mess
HondaHarry
05-13-2006, 11:39 PM
Alky likes advanced timing, so I you decide to run gasoline in it, check the flywheel to see if another keyway has been added, or the stock one welded up and a new groove machined. Im not sure what kind of advance it has from rotax, so there is a good chance the ignition is stock, but it dosent hurt to check. HH
erectordale
05-14-2006, 12:32 AM
Thanks for all the input guys I will check on all the mentioned changes that could have been made
WIkid500
05-14-2006, 10:12 AM
actually we are talking about a 2 stroke,,, no such thing as a high compression piston for one :eek:


trying to use a carb for both is way to much work ,,, it would be alot easier on your brain to get another carb,


well excuse me!

how about a shaved head or different cylinder domes...

there that better?

no hard feelings man. just bustin your balls LOL
hrc85250r
05-14-2006, 05:02 PM
well, first off the timing is different, for sure. then the porting is alcohol specific if its not cobbled together, the head is usually specific too. and remember when you ru alcohol, it takes 1 and a half times as much alcohol as gas because alcohol is an axygen carrying molecule, so to get 14.7:1 you need more fuel. you should run a vacuum fuel pump too.