Carb float bowl nightmare

[dietcoke]

Hi All,

I have taken the carb off of my mark 2, to give it a clean and install shiny new jets and gaskets from lesuire trail ( to solve surging issues on the overrun ), but I have stumbled at the first hurdle. The Float bowl screws are stuck hard and chewed to bits. I went to the local engineer workshop an he suggested 6 hours in coca cola, may help shift them. Which I am trying now. If not he can try drilling them out and helicoil but it will be around £150 quid, with no guarentees !!!! Any suggestions greatly appreciated.

Also I had picked up another carb off of ebay, which all looks fine apart from a bent idle screw. But the two carbs are slightly different, where the main jet pokes out at the bottom of the slide area, the one I bought off of ebay protudes only a couple of mil, but the one I took off of the bike protudes about 10 - 15mm in a semi circle ????? I presume these are differences in Marks 1 / 2 / 3 ??? Can anyone shed any light and are they interchangeble.

[knackeredMk1]

Not quite sure what you mean by 'protrudes in a semicircle' but the tube that the needle fits into shouldn't protrude that much ('10-15mm') into the area that the throttle slide controls.

Can you post some photos as attachments (I think you can do that without becoming a dite supporter) .

[dietcoke]

Hope photo links work. Both taken from the same side

Ebay purchase carb photo

http://i855.photobucket.com/albums/ab11 ... AG0082.jpg

Taken off bike carb photo ( CRM 250 mark 2 )

http://i855.photobucket.com/albums/ab11 ... AG0081.jpg

[knackeredMk1]

The 'shroud' that is in the second photo was not in the Mk1, but I think was in the Mk3 .

I have always found that even the most mashed float bowl screws can be removed by gripping the heads very firmly with pliers and turning them with the pliers. I suppose it depends on getting the right size of pliers . Post up a photo. £150 is just silly.

[twistednuts]

Agree, should easily undo with decent pliers, mine were the same an came out easily. If they still won't budge, try tappin them round with blunt blade of a flat screwdriver an a hammer. If you still can't manage it, send it to me an I'll do it for £145, ha

[knackeredMk1]

I'll do them for £100 .

[dietcoke]

You guys are brilliant !!!! One pair of mole grips and a couple of turns and they came right off :-) Thanks a lot all four screws out.

I will continue the clean and jet change tonight / tommorrow.

Now I just need to get some replacement screws.

[abigsupermoto]

The 'shroud' that is in the second photo was not in the Mk1, but I think was in the Mk3 .

Just had a look at my carb (MK3) and it does have the shroud as the second pic

[voodookid37]

Now I just need to get some replacement screws.

i usually bung in some stainless allens,witha smidge of copaslip or similar on the threads.......never had any probs after doing that ........

[knackeredMk1]

+1.