90MAX
Member
Good evening all,
I just got back from a nice long freeway trip (About 500 miles), and I noticed some slight surging when I was cruising at around 65 - 70mph / 4500ish RPM (5th gear). It's something I've noticed a few times in the past, but not too often, because most of my riding is 55mph or below. I'm wondering what might be causing this. I've searched the forums a bit, but haven't found much info regarding my particular set of circumstances. I'll lay out what I can below, and I would greatly appreciate any info that anyone is able to provide.
1990 Vmax
-Stock, except for what I think may be a K&N drop in filter.
~37000 miles.
-Starts and idles fine.
-Usually warm enough to turn off choke after warming up for a minute, and 2-3 minutes of gentle - normal riding.
-Once it's warm, it pulls nicely from about 2500RPM on up, with the expected kick in the pants after 6000RPM.
-Temp gauge when cruising around town usually reads below 3 o-clock (less than half-position)
-Temp gauge when cruising at 65 - 70MPH reads about 4 o-clock or a bit lower.
-Occasionally when I'm going past 4000RPM or so I notice a slight backfire.
-Occasionally I put out some gray smoke from the tailpipes, fairly certain I'm not losing any significant amount of oil or coolant.
-I noticed a slight surging at 65 - 70MPH/4500 - 5000RPM, it wasn't consistent, but came and went. :hmmm:
-Bike spent the winter in the garage, with fuel stabilizer in the tank, and run through the carbs.
-I've put about 750 miles on since I got it out for the season.
-I did notice this on a couple of occasions last year, after I purchased it in September.
I know that's a lot of info to digest, but I tried to list everything I thought would help. If I've missed a vital piece of info, please let me know.
I would sincerely appreciate any input that anyone has to offer.
Thanks!
/Sorry if this should be in the carbs/tuning section, I wasn't too sure.
I just got back from a nice long freeway trip (About 500 miles), and I noticed some slight surging when I was cruising at around 65 - 70mph / 4500ish RPM (5th gear). It's something I've noticed a few times in the past, but not too often, because most of my riding is 55mph or below. I'm wondering what might be causing this. I've searched the forums a bit, but haven't found much info regarding my particular set of circumstances. I'll lay out what I can below, and I would greatly appreciate any info that anyone is able to provide.
1990 Vmax
-Stock, except for what I think may be a K&N drop in filter.
~37000 miles.
-Starts and idles fine.
-Usually warm enough to turn off choke after warming up for a minute, and 2-3 minutes of gentle - normal riding.
-Once it's warm, it pulls nicely from about 2500RPM on up, with the expected kick in the pants after 6000RPM.
-Temp gauge when cruising around town usually reads below 3 o-clock (less than half-position)
-Temp gauge when cruising at 65 - 70MPH reads about 4 o-clock or a bit lower.
-Occasionally when I'm going past 4000RPM or so I notice a slight backfire.
-Occasionally I put out some gray smoke from the tailpipes, fairly certain I'm not losing any significant amount of oil or coolant.
-I noticed a slight surging at 65 - 70MPH/4500 - 5000RPM, it wasn't consistent, but came and went. :hmmm:
-Bike spent the winter in the garage, with fuel stabilizer in the tank, and run through the carbs.
-I've put about 750 miles on since I got it out for the season.
-I did notice this on a couple of occasions last year, after I purchased it in September.
I know that's a lot of info to digest, but I tried to list everything I thought would help. If I've missed a vital piece of info, please let me know.
I would sincerely appreciate any input that anyone has to offer.
Thanks!
/Sorry if this should be in the carbs/tuning section, I wasn't too sure.
