thunder1295 Posted April 22, 2015 Share #1 Posted April 22, 2015 Wondering what makes a carb pop or back fire, had the air breather off and on occasion number 1 and 3 carb pops. Is it because its running rich? Plugs are new. Link to comment Share on other sites More sharing options...
tz89 Posted April 22, 2015 Share #2 Posted April 22, 2015 I would start by looking for air leaks - make sure everything got back together as it should. Link to comment Share on other sites More sharing options...
thunder1295 Posted April 22, 2015 Author Share #3 Posted April 22, 2015 What I did was block off the YICS ports and took off the air breather cover, sprayed carb cleaner on the intake manifolds and the bike didn't rev up stayed the same, don't think there are any leaks on the carb's, any other reason's it might be doing that? Thanks Link to comment Share on other sites More sharing options...
BlueSky Posted April 23, 2015 Share #4 Posted April 23, 2015 If you have the air filter off, popping back is normal. Link to comment Share on other sites More sharing options...
van avery Posted April 23, 2015 Share #5 Posted April 23, 2015 Your valves may be too tight. You might do a compression check. Link to comment Share on other sites More sharing options...
tz89 Posted April 23, 2015 Share #6 Posted April 23, 2015 I think you may be too lean in one or more cylinders. And you should sync your carbs. Link to comment Share on other sites More sharing options...
camos Posted April 23, 2015 Share #7 Posted April 23, 2015 What I did was block off the YICS ports and took off the air breather cover, sprayed carb cleaner on the intake manifolds and the bike didn't rev up stayed the same, don't think there are any leaks on the carb's, any other reason's it might be doing that? ThanksDoes that mean there was no popping before blocking off the YICS ports...seems that might be what you are saying? Or, did you block off the ports because it was popping? Popping is usually a sign there is a lean condition which is why spraying carb cleaner on potential leak areas is an effective test. Any leaks will draw carb cleaner into the intake and make the REV's go up. Link to comment Share on other sites More sharing options...
thunder1295 Posted April 23, 2015 Author Share #8 Posted April 23, 2015 Yes there was popping before, 1 of the YICS hose was broken off the plastic box, so I figured I just by pass that, cut the hoses short and put in 8mm bolts with little bit of high temp gasket maker., Then I sprayed the carb cleaner on the manifolds no leaks, syn the carbs and adjusted the pilot screws. Running much better now, no popping and it fired right up today and it was 0 outside, never did that before I be cranking away on the starter. Still have to take it for a spin to really find out how it's running, hope all is good. Thunder. Link to comment Share on other sites More sharing options...
Marcarl Posted April 24, 2015 Share #9 Posted April 24, 2015 You need to have the airbox and filter in place for it to run well. Also for doing a carb sync. Link to comment Share on other sites More sharing options...
thunder1295 Posted April 24, 2015 Author Share #10 Posted April 24, 2015 I had the air box back on when I syn the carbs and tested for leaks, like I said running much better now, when I ride it I'll know for sure. Thanks Link to comment Share on other sites More sharing options...
tankerman Posted April 24, 2015 Share #11 Posted April 24, 2015 Just my two cents worth but I've had that problem on a previous Star with aftermarket exhaust turns out the jetting was to lean I fattened it up a bit and the popping disappeared. Link to comment Share on other sites More sharing options...
Kc9ojn Posted April 25, 2015 Share #12 Posted April 25, 2015 Had same problem on my gen 1 ,checked sync fire ,air, then pulled all the plugs and put new ,no more popping and power Is back. Plugs are cheap worth a try. Link to comment Share on other sites More sharing options...
thunder1295 Posted April 26, 2015 Author Share #13 Posted April 26, 2015 Good new's, been a long process getting the bike to run perfect, after changing plugs, cleaning all connections going to the tci and pick up coils, trimming the coil wires and screwing the plug caps on again, sync the carb's, adjust the pilot screws, still didn't run right, cylinder would still cut out after 10 miles or when it got warmed up good from idle to 3000rpm. What was left to do, move the tci onto the airbox, nope. came across a thread about the YICS, sure enough one hose attached to it pretty well fell off when I pulled on the hose, not sure what shape the rest of the plastic box YICS was in so I by passed it. Cut off all the hoses capped them, re sync the carb's and pilots took it out for a good long run and "WOW" not one miss, runs as smooth as glass, couldn't be happier. Get rid of that YICS, had that on my 750XJ and it was a huge pain on that bike to. Like to say a big thanks to everybody that joined in to help me solve this problem. Great site. Hope this might help another member solve their problem if their bike is running the way mine was. Thunder Link to comment Share on other sites More sharing options...
flyday58 Posted April 26, 2015 Share #14 Posted April 26, 2015 Glad to hear it. Removing and capping the 'YUCKS' was one of several things I did at the same time like you did. Was never sure which thing actually got rid of the popping but the YICS probably had a lot to do with it. Enjoy that bike. Which you should totally add to your profile so we all know what you ride! Link to comment Share on other sites More sharing options...
thunder1295 Posted April 26, 2015 Author Share #15 Posted April 26, 2015 I will thanks, I posted in the Gallery, brown Royal, ... Link to comment Share on other sites More sharing options...
jasonm. Posted April 29, 2015 Share #16 Posted April 29, 2015 all I can say is.....intake O-rings below each manifold Link to comment Share on other sites More sharing options...
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