Nelso90 Posted July 27, 2021 Share Posted July 27, 2021 For some context I was coming home from work yesterday, approximately 92F outside and I chose to take surface streets so I wasn't going too fast. The bike got up to 223F coolant temp, fan came on as normal and cooled things down. As I kept riding I started to notice a "popping" noise out of the intake (my flapper has been deactivated) when I would let off the throttle and slow down. With this popping/gurgling noise would come a slight lurch...like barely noticeable. As I kept riding, the bike seemed to start missing under part throttle. If I whacked the throttle open it would run totally fine, but trying to maintain any cruising speed say under 10% throttle position and it just kept surging and lurching and cutting out. I had this happen a few years ago when I lived in Indiana, and it got so bad the bike would just die and I'd have to wait for it to cool before it would even restart. When I got home, I parked the bike and raised the revs to around 3-4k (hard to keep them steady anyway on these bikes) and it would just rev up and cut out totally, then cut back in, then out again. My first inkling on this one is maybe it's ignition coils getting heat soaked and breaking up...but before I replace $270 worth of those I figured I'd get some help. Thanks, Link to comment Share on other sites More sharing options...
Member Contributer Cogswell Posted July 27, 2021 Member Contributer Share Posted July 27, 2021 FWIW, Honda coilpacks are made by Denso and are of high quality. Failures are rare. If replacing though, those used on the VTEC engine are the same ones used on many Honda / Acura automobiles - CRV, Civic, RSX and others. Find the Denso part number and do a search - you'll tons of them on ebay or elsewhere - you do not need to buy them from Honda Powersports. Just curious - why has your flapper valve been deactivated? Link to comment Share on other sites More sharing options...
Member Contributer Thumbs Posted July 27, 2021 Member Contributer Share Posted July 27, 2021 Fuel boiling? Link to comment Share on other sites More sharing options...
Nelso90 Posted July 27, 2021 Author Share Posted July 27, 2021 42 minutes ago, Cogswell said: FWIW, Honda coilpacks are made by Denso and are of high quality. Failures are rare. If replacing though, those used on the VTEC engine are the same ones used on many Honda / Acura automobiles - CRV, Civic, RSX and others. Find the Denso part number and do a search - you'll tons of them on ebay or elsewhere - you do not need to buy them from Honda Powersports. Just curious - why has your flapper valve been deactivated? Good to know on the coil packs. If I end up replacing those I'll check around. I did the intake snorkel delete and flapper valve mod because it sounded better, pure and simple. I wanted some more intake growl. It didn't seem to affect the bike really other than sound and it's run well for years prior. Link to comment Share on other sites More sharing options...
Member Contributer BusyLittleShop Posted July 27, 2021 Member Contributer Share Posted July 27, 2021 Motorcycle troubleshooting is a form of problem solving... It is a logical search for the source of a problem so that it can be solved... it ain't about jumping to conclusions... always eliminate the battery first... because you find that 90% of the time it proves to be the weakest link of your bike... and so much depends on correct voltage that it's pays to have your battery tended to a charger at all times... Start with the battery for it's the weakest link in the whole system... To determine the condition of an Maintenance Free battery give it a refreshing charge... wait 30 minutes... measure terminal voltage... 12.8 or higher is a good battery... 12.0 to 12.8 is a insufficient charge... recharge... 12.0 or lower... battery unserviceable... Link to comment Share on other sites More sharing options...
Member Contributer DannoXYZ Posted July 28, 2021 Member Contributer Share Posted July 28, 2021 Also coils tend to fail at high-load/high-RPMs when mixtures are denser and there's less dwell time to charge them. Trouble at low-load/low-RPMs while clean-running at higher-loads is certainly not coils. Link to comment Share on other sites More sharing options...
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