docc Posted July 8, 2008 Share Posted July 8, 2008 The Sport's been running awfully lean: popping on the overrun, stumbling at idle and such. When I spray solvent into the spring on the bottom of the right throttle body, the idle goes up a couple hundred rpm. I presume the seal on the shaft is done. Are these rebuildable with an O-ring or such? Can I take it apart on the bike? Link to comment Share on other sites More sharing options...
gstallons Posted July 8, 2008 Share Posted July 8, 2008 Does his happen to the other side? There is a good chance you can do this to ALL V11 bikes. Link to comment Share on other sites More sharing options...
docc Posted July 8, 2008 Author Share Posted July 8, 2008 It's not so pronounced on the left. I've never had a throttle body apart. Surely, it couldn't be as bad as a carburator? Link to comment Share on other sites More sharing options...
raz Posted July 8, 2008 Share Posted July 8, 2008 I never did that test but I am sure I have the same problem. My springs underneath collect dirt very fast, and they drip. Very little, but it is there. I haven't got around to fixing it but I will follow your lead, it should be easy to dismantle it and hopefully find an o-ring there that is not too hard to find a replacement for. Link to comment Share on other sites More sharing options...
Paul Minnaert Posted July 8, 2008 Share Posted July 8, 2008 And you are shure that it ain't the intake rubbers? because they can have little leaks. Link to comment Share on other sites More sharing options...
docc Posted July 9, 2008 Author Share Posted July 9, 2008 I have retightened the intakes (maybe overtightened?), wrapped them with electrical tape and done the spray test on them. I've thought to just replace them as a matter of course. The positive spray test on the bottom of the TB shaft seems definitive. Does anyone else's raise rpm when the lower shaft is sprayed? Link to comment Share on other sites More sharing options...
andy york Posted July 9, 2008 Share Posted July 9, 2008 I haven't had time to dive into it yet...The unfortunate thing is that I don't think there are any o-rings to replace This was a problem on the Weber carbs on 911's ....the throttle shaft rides on the aluminum body of the carbs. There was a place in LA that had a fix for the Webers. i actually saw a few drips of fuel run down the bottom of the throttle body. If I rode in stop and go traffic this would be terribly frustrating. I don't so its not. It is a little annoying. Yes ...I have already tried the computer adjust and no luck. Mine is 3K and below and I rarely ride at that rpm (when I'm being paced ) I have 55k on mine, yours is close to that, and I know of another at almost 30k that might just be starting this. andy Link to comment Share on other sites More sharing options...
docc Posted July 9, 2008 Author Share Posted July 9, 2008 So this may be a case of the shaft 'ovaling' out the housing? All is well with the throttle open (which is where I like it after all! ), but slow speed turns and idling in traffic are annoying, even alarming if the thing pops in a turn pulling away from a stop. I'm going to try to get to Corse Motorsports in Nashville the next couple of days and tickle the ECU with the Axone. (57,500 miles on the Sport now!) Link to comment Share on other sites More sharing options...
andy york Posted July 9, 2008 Share Posted July 9, 2008 Did she ram your cargo into the back of the gas tank ? I'm looking for a used set of throttle bodies to see what can be done . hopefully high mileage I at the shop now call me andy Link to comment Share on other sites More sharing options...
Dan M Posted July 9, 2008 Share Posted July 9, 2008 It's not so pronounced on the left. I've never had a throttle body apart. Surely, it couldn't be as bad as a carburator? I've never had one of these apart either but you are right about easier than a carburetor. There is not much there. I doubt there is an o-ring or other rubber seal on the throttle shaft. Most rely on the fit of the throttle shaft against the brass bushing. The only replaceable seal is probably an o-ring on the air screw. (I'd certainly be interested to know if anyone has dismantled one of these and there actually is a replaceable seal) Try to wobble the throttle shaft from side to side. There should be a very small amount of play. If it is really sloppy the bushings are worn and that is the source of your vacuum leak. If it is snug, I'd look elsewhere. Link to comment Share on other sites More sharing options...
Skeeve Posted July 9, 2008 Share Posted July 9, 2008 This was a problem on the Weber carbs on 911's ....the throttle shaft rides on the aluminum body of the carbs. There was a place in LA that had a fix for the Webers. Did they call this fix "...a heavy dab of grease?" Just curious... Link to comment Share on other sites More sharing options...
docc Posted July 12, 2008 Author Share Posted July 12, 2008 I've never had one of these apart either but you are right about easier than a carburetor. There is not much there. I doubt there is an o-ring or other rubber seal on the throttle shaft. Most rely on the fit of the throttle shaft against the brass bushing. The only replaceable seal is probably an o-ring on the air screw. (I'd certainly be interested to know if anyone has dismantled one of these and there actually is a replaceable seal) Try to wobble the throttle shaft from side to side. There should be a very small amount of play. If it is really sloppy the bushings are worn and that is the source of your vacuum leak. If it is snug, I'd look elsewhere. There is some play. Especially up and down on the right. Yours? Link to comment Share on other sites More sharing options...
stormsedge Posted July 12, 2008 Share Posted July 12, 2008 My right side has a drip and gathers dirt as well. I also have a stumble and pop right around 3Krpm that I have been unable to cure. I hadn't thought that this could be the problem, but am now suspicious of it. Pls post what you do to fix. k Link to comment Share on other sites More sharing options...
Dan M Posted July 15, 2008 Share Posted July 15, 2008 There is some play. Especially up and down on the right. Yours? Sorry docc, I just saw this. Yes, both have minor play side to side and up / down. I'd guess about 1-2mm each way. Link to comment Share on other sites More sharing options...
docc Posted July 16, 2008 Author Share Posted July 16, 2008 I just compared the play to another V11 with 55,000 miles and it was much worse than mine (and suffering from the same*pop*-stumble). I still intend to tweak the CO but suspect that the shaft play is going to be a trouble-maker for all the higher mileage v11s. Link to comment Share on other sites More sharing options...
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