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Tue Feb 24, 2009 3:59 am

I have a progressive carb on a 1835cc sand rail and I am having problems with the carb linkage sticking open for the secondaries. I have cleaned the linkage with carb cleaner and I am not lubing it just leaving it dry. It will work fine until sand gets thrown up and gets into the linkage. Is this a normal thing for the progressive? I put a stiffer spring for the secondaries but I think the problem is in the linkage for the main's. I have not taken it apart yet to see if something is worn out in the main linkage. Is there an easy fix out there or a kit to fix this problem? I also have been thinking of making a thin aluminum deflection plate to block the sand from getting to the linkage, has anyone tried this approach? Thanks for any and all help.

Tue Feb 24, 2009 7:55 pm

Shield sounds like a good idea.

Wed Feb 25, 2009 1:00 am

I was thinking about this and was wondering if there is a way to make the secondaries open/close with the mains so it is no longer a progressive but like a single 40/44? It is in a sand rail so fuel economy is not a big concern. Would there be a problem tuning the carb this way or do you think that it would work? Has anyone attempted to do this before? Thoughts concerns?

Wed Feb 25, 2009 1:44 am

weber sells a carb like that its a 36/36

http://www.webercarbsdirect.com/product_p/wk410-36s.htm

Wed Feb 25, 2009 2:33 am

shakira wrote: weber sells a carb like that its a 36/36

http://www.webercarbsdirect.com/product_p/wk410-36s.htm

If I am going to go with a new carb it will be the single 44. That is what I am going to try to make mine like. I don't know if it will be possible or what the tuning problems will be but I would think it can be done if I can figure out the linkage situation. I have a couple of ideas to look into to see if they will work or not. If anyone else has tried this and has a sure way to do it, I would like to know how it was done. I will update on my findings.

Wed Feb 25, 2009 4:59 am

I will be interested to hear how that goes. I have a progressive that only performs well when the secondary is operating. I have to keep my foot in it so they may as well operate together.

Wed Feb 25, 2009 6:03 am

larryvance66 wrote: I will be interested to hear how that goes. I have a progressive that only performs well when the secondary is operating. I have to keep my foot in it so they may as well operate together.

Do you have the carb tuned right? I know that these are a pain to properly tune/setup. I was lucky and seems that the guy that had the motor before me had it tuned pretty good.

It will probably be a little while before I get to this but might be able to get to it next week. I will keep everyone updated and will give the best parts list to my ability if all works.

Wed Nov 04, 2009 1:55 am

OK I forgot about this thread but here is an update. I did attempt to "sync" the main and secondary with two of the aftermarket linkage kits for the 32/36. The flat spot on the butterfly's are not "clocked" the same so it didn't work out as planed. I still think it is possible but you would have to custom make your own circular cams that mount to the butterfly. I am over it and getting a single 44 for this car.

Wed Nov 04, 2009 5:47 am

whenever i was into large scale r/c (1/5th and bigger) we would put o-rings on the outside of our carb shaft and cover them in dielectric grease and put a balloon over that to keep them from sticking when duning... may be worth a shot, just a one trip use, then wash the o-rings off, rinse the grease, and start again for the next trip!

Wed Nov 04, 2009 6:40 am

Bruno Vegas wrote: whenever i was into large scale r/c (1/5th and bigger) we would put o-rings on the outside of our carb shaft and cover them in dielectric grease and put a balloon over that to keep them from sticking when duning... may be worth a shot, just a one trip use, then wash the o-rings off, rinse the grease, and start again for the next trip!

Thanks for the tip, I might of tried it before the last trip. I tried to make a shield and that didn't work either. I am sick of ruining trips because of this carb, I am getting the single weber 44 setup.