February 2, 201511 yr After poor running I found the carb to be missing what I believe to have been a blanking cap, but can anyone confirm it is just a blanking cap or is it something more technical? With it missing I think it would of made the bike run lean due to the open end delivering unfiltered air directly into the slide area of the carb!
February 2, 201511 yr FROM MEMORY MY REV4 HAD A BLACK RUBBER BLANK ON HERE THEY SEEM TO PERISH AND SPLIT ,IT DIDNT SEEM TO MAKE A DIFFERENCE WHEN I FIXED THE SPLIT
February 2, 201511 yr It does indeed have blanking plug and they do perish as you can see by the pic of my wife's 250 4T. On my next parts order....its a year old. In fact... I might pop down to local bearing supplier and grab a plastic blanking plug verses the cheap rubber stock one and no more perishing for ages. Mags
February 3, 201511 yr Jfc, take a look at http://www.trialscentral.com/forums/topic/42991-where-does-this-rubber-thingy-go/?hl=portman#entry313751 . Lampkins could never find a part number so couldn't provide a replacement. I ended up using something I had in the workshop, although it seals off the tube completely. I couldn't detect a difference in the performance (save that the backfiring problem mostly disappeared) but perhaps it explains why I still ride like a wuss!
February 3, 201511 yr Author Thanks for all the info. Portman I could do with a reason for riding like a wuss!
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