Join Date: Oct 2018
Location: Vancouver Island
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So as the title implies, I'm trying to solve an engine misfire issue.
The bike is a 2015, cb300f. Riden daily, rain or shine. However the last week or so it started to misfire under low speed acceleration, gears 1 through 3. Once up to cruising speed there did not seem to be any problem.
The issue has progressed and now misfires under acceleration and load, such as going up steep hills, also in higher gears while accelerating.
I put some injector cleaner in tank....still misfire.
I took the tank off and checked for water in the gas....none.
I checked the air filter.....clean.
I checked fuel filter....blew fuel through it from both sides and seems ok.
I then put the tank back on, put some gas in and tried riding and still had misfire.
I have now taken the tank back off, and changed my spark plug, however the old one looked OK.
One thing I noticed was that it was easy to take the spark lead boot off, and with the new plug in, the spark plug boot does not fully seat down around the lip of hole in the engine. ( am i describing this clearly ? ) I seem to get good connection to the spark plug though with a solid feeling connection. I also seated the spark plug as per the NGK guidelines. How loose or tight does the spark plug boot seat onto your engine ?
I have yet to try and ride with a new spark plug. If this does not solve the issue, my next plan is to buy a new coil pack and see if its that.
Anyway, any thoughts ? It seems like it could also be a fuel flow problem....injectors ?