maybe it is lack of airflow. On my old bike, some gas backflowed out of the carbs into the air filter, even after the filter dried, it didnt get up n go anymore at higher rpm....so make sure your air filter is allowing all the air you need to pass through it.

 

I removed my carbs took apart the jets and used the finest piece of wire I could find (came from a twist tie that held my neighbors toy in the box). You don't want to use the wrong guage wire. You run the risk of widening the holes, making the problem worse. The Jets were unbelievably clogged. Only took me about 2 hrs.

(Note: My bike was sitting 4 yrs with old gas in it. Not sure how effective Seafoam would have been in this situation, but for me it was worth the experience of understanding how the carburator works).

 

Yeah, it sounds to me like your carbs need a good cleaning. However, in a car (was a car mechanic for 6 years), if you can sit at idle and rev it out, or rev it up slowly in gear, but kickin' it to WoT and it sputters, it's a misfire under a load situation.. Usually, in my experience, a good place to check would be your spark plugs. If those are old/corroded/carboned up/burnt off/improperly gapped, you'll get sputtering under heavy load like lockin' it back to WoT. I know, 90% of the time, I'd change the spark plugs and the wires in a car and it'd run like a champ! Hope that gives you another idea to check. Good luck!

 

Yup I had the same problem on an older bike it turns out the air filter was clogged to crap. It could get air through but when it needed alot at once it couldn't pull it. Replaced air filter and it worked.

 

Good sound advice. I'll be pulling the plugs and filters out thisweekend to make sure all is OK there. Keep you posted and thanks again.

 

i was wondering is it bad to pour sea foam directly into you carbs from the airfilter openings?

 

Are you reffering to the velocity stacks, when you say air filter openings? I've sprayed standard carburator cleaner down there before (while reving the engine a bit) with no ill effect, so I'm guessing Sea Foam is a similar type of product, but without a spray nozzle. Without the nozzle, you might get too concentrated an amount in there all at once, which would probably choke the engine off. You may also free up too much crap in the system which would clog the carbs up more. I once mistakinly tried STP carb cleaner in my tank in a too concentrated amount a few years back. It had the effect of releasing too much crud at one time and the carbs needed to be removed, soaked in varsol, recalibrated and reinstalled. Won't do that again.

 

Seafoam in the gas. Run the tank partway empty and let it sit for a day or two. Then run it down and put new gas in it. If that doesn't work then it is time for a carb cleaning.

Check to be sure there aren't any critters in the air filter or that you didn't over oil your filter if it is a foam or cotton guaze filter.

If you have a gas filter replace it. Double check your gas lines haven't deteriorted and gunked everything up. Double check your gas tank vents are not clogged.

Double check your throttle cable (s)are lubed so thatthey don't lag when you roll on to WOT.

Did you have any gas in the tank before you filled it up with the fresh stuff? If so you may want to flush the crud and rust out of the tank. On my Kawasaki Concours there is a little metal mesh screen in the petcock that should also be cleaned but not sure if you have that or not.

If it sat long enough all new plugs, fresh gas, tune up is probably worth while anyway.

I believe if you can't find the Seafoam you may be able to find the Chevron Techron cleaner or Berryman Carb Cleaner. (Techron, Berryman carb cleaner,and Seafoam is all they use at the Concours.org (COG)web forum) I believe the Berryman carb cleaner is found just about anywhere even at Walmart. So is the Techron cleaner. I always liked the Redline SI-1 fuel system cleaner but they now make a motorcycle specific fuel system cleaner.

 

Well dudes, too much OT at work and the fact that I also own a 2000 Honda Magna Cruiser have conspired against me and I just haven't checked all the things suggested in your replies yet. I have removed and cleaned the air cleaner. That did nothing. I've finally gone through 2 tanks of gas with Seafoam. One thing is for sure, Seafoam does improve overall throttle response very well. For a while there, I thought it may slowly be doing the trick, as I noticed that lower gear WOT was getting a lot better, but still problems in the higher gears. After letting the bike sit for a week, the problem came back in all gears under WOT only. One thing I never mentioned before was that the problem only occured as the RPM's hit 7-8000 plus. Never down in the lower RPM's. I'm guessing that plugs and wires have to be changed now. I don't put many miles on this bike per year as I ride the Magna a lot more. The plugs are 3 years old with maybe 6000 miles on them, but the wires are original. Keep you all posted and thanks again. Keep the sugestions coming if there are any new ones. Oh wait, when I had the tank off to clean the filter, the were a bunch of smaller little filters (sealed in little black plastic boxes) running off of thin foam air lines from somewhere (maybe the low soeed RAM air). How are thosefilters replaced and how often? They are originals.

 

Its most likely your carbs, time to suck it up and take em off and clean em out [:@]

Its only scary your first time around!