Carb Trouble?

[technomix]

Hello; I`ve got a problem with my 1998 Beta Techno. History of the bike is unknown; when I received the it was in pieces, and I just put it back together.

Problem is, the bike will start, but runs really "heavy", poor throttle response. Adjusting the idle and mixture screws has absolutely no effect, and it won`t idle. I pulled the plug, and it`s really wet and oily. Adjusted the carb float to reduce fuel in float bowl, no change. Took out the airf filter to give it more air, no change, still runs rich. Shut off the fuel petcock and run it for about 10 seconds, and the engine suddenly starts to rev like crazy, quickly turn the fuel petcock back on and it goes back to running rich again.

It`s got a Dellort carb on it with the following jets installed (bad eyesight so I could be mistaken!) Pilot 100, Main 54, Needle 262. Needle in the top clip at the moment.

Any and all advise appreciated, Thanks

[houseape1000]

Clean the carb out with can of carb cleaner and a compressor, then clean it out, then again, and again, and once more for good luck.

If this doesn't sort it at least you will have a really clean carb.

Also, clean the fuel tank and fuel line. You don't want to dirty your nice clean carb.

[technomix]

Sounds like a good place to start. I`ll clean out the carb tomorrow and let you know the result.

Thanks for the speedy reply

[stork955]

Gday, as far as I can tell from my parts books, that Techno should have a Mikuni fitted (my 99 certainly has). I'd say someone's has been "fixing" it. See if you can get a Mikuni from a later techno and fit that. It would solve your issues in one foul swoop. Carb swaps dont work easily as there is always setting up to be done.

Cheers,

Stork

[technomix]

After cleaning my carb so it`s spotless, still no change for the better. I think STORK955 may have a good point. The engine and electrics are from a 1998, but the frame is a 1994. The only manual I have is for a 1994, and it shows the Dellorto carb. I`m starting to think that my friend gave me the wrong carb for this year motor. I`m going to see him on Sunday and try switching carbs and see what happens.

Thanks for the tip, I`ll let you know how it works out.

[vgstef]

Make sure your float do not have any fuel in them. I did have a problem with Del carb on a Gas Gas, the float did have some fuel inside.

Stef

[technomix]

Thanks, will check. Are those floats hollow?

[technomix]

My bike is fixed!. My friend fired up the bike and it ran like a dream. Nothing to fix, it run`s great he says. He was quite amused when I told him that I had been using the choke in reverse!. This is the first time I`ve ever seen a carb where lever up = off. I had been starting the bike with the choke in the off position (up), then soon switching it to the on position, causing it to run rich. Oh well, if you can`t laugh at yourself, who can you laugh at!?

Thanks for all your input and advise, very much appreciated