Sputter at full throttle
Thread Starter
Senior Member
Back Marker
Joined: Apr 2007
Posts: 147
From: Minnesota
Sputter at full throttle
Ok, hope someone can point me in the right direction. My 98 SH got a new paint job when pulling it out of storage this year (stored it last year like before using fuel stabilizer). Now when I hit full throttle (no matter what gear) once it hits about 6k rpm, there is a huge lack of power and it sputters until it gets closer to 8-9k rpm. Another thing is that I only put 72 miles on the bike last year (no that wasn't a misprint...72 miles).
So I wondering if the carbs could have gotten gummed up over that period of time or if a vaccuum leak would cause this? Possibly something was left in the tank from the paint job? Not really sure. I filled up the tank with 93 octane gas and about 4 ounces of Seafoam. Haven't run that tank empty yet so not sure if that will clean it out or not.
Any suggestion?
So I wondering if the carbs could have gotten gummed up over that period of time or if a vaccuum leak would cause this? Possibly something was left in the tank from the paint job? Not really sure. I filled up the tank with 93 octane gas and about 4 ounces of Seafoam. Haven't run that tank empty yet so not sure if that will clean it out or not.
Any suggestion?
Senior Member
SuperSport
SuperSport
Joined: Dec 2006
Posts: 880
From: Victoriaville, Quebec, Canada
Try cleaning the main jets, check the floats for proper operation, there is no vacuum at WOT so not much leak possible. First check your plugs, they should have something to say.
Thread Starter
Senior Member
Back Marker
Joined: Apr 2007
Posts: 147
From: Minnesota
When I bought the bike 5 years ago the owner had already installed a K&N Air Filter (I just cleaned with recharger kit when the bike was at the paint shop) and rejetting (not sure what size jetting though). The bike has the full TBR CF setup. I did put the factory exhaust on over the winter (was going to sell bike) but now have the TBR back on. The bike has 11,500 miles on it. My altitude is 841 feet above sea level.
Senior Member
Superstock
Superstock
Joined: Apr 2007
Posts: 293
Was he saying that he only got 72 out of the tank? I read it as, he only put a total of 72 miles on it, in the last year of riding ie: nothing to speak of. So I would think that yes, you have some varnish build up...though finding our your jetting would be useful info.
-R
Administrator
World Champion
Joined: Dec 2004
Posts: 105,287
From: Fulton, MO
hehehe, yes you are correct. I misread the post. Sorry. You will still need to find out what your carbs are doing and the best way to do that is to tear into them yourself...or pay someone to do it. Usually with gummed up carbs the idle circuits are affected first because they have the smallest orifices (orifi?). If you're not up to the task then bring it in and have them cleaned. Tell them to write down all your settings while they are in there. Remind them that the carbs are different so do one at a time.
Senior Member
SuperSport
SuperSport
Joined: Dec 2006
Posts: 880
From: Victoriaville, Quebec, Canada
Got to pull them out to check and correct the problems, it's the only way you'll know for sure what you got, seem like major surgery at first, but the second time I did it took me one hour and a half to pull the carbs back the needles and put them back on using a hand drill with a long phillips bit, all that sipping beer.
You may have to order new jets, maybe they are ok but clogged by some rust debris/goo.
You may have to order new jets, maybe they are ok but clogged by some rust debris/goo.
Thread Starter
Senior Member
Back Marker
Joined: Apr 2007
Posts: 147
From: Minnesota
Thanks. I figured that was the anwser but always hoping for that simple fix. Gonna run a tank of seafoam through it and then pull the carbs.
what jet size, clip position, ect... should the carbs be at 800 feet elevation, full TBR CF exhaust, K&N filter?
what jet size, clip position, ect... should the carbs be at 800 feet elevation, full TBR CF exhaust, K&N filter?
Member
Squid
Joined: May 2007
Posts: 99
From: Akershus, Norway
Thread Starter
Senior Member
Back Marker
Joined: Apr 2007
Posts: 147
From: Minnesota
RE: Sputter at full throttle
Thanks on the K&N report. I did clean and oil the filter when the bike was at the paint shop. Gonna take it off and reclean it and see if that changes anything
Senior Member
Back Marker
Joined: Oct 2006
Posts: 224
Sputtering
Did you have fuel stabilizer in the tank, carbs..fuel system? If the bike sat with the same gas for a long time without stabilizer it will have broken down in the carbs and gummed them up..Pretty much a carbs off cleaning job...If you had stabilizer, gas was fresh..did you have the carbs off at all??
Dave
Dave
Member
Squid
Joined: May 2007
Posts: 99
From: Akershus, Norway
Did you have fuel stabilizer in the tank, carbs..fuel system? If the bike sat with the same gas for a long time without stabilizer it will have broken down in the carbs and gummed them up..Pretty much a carbs off cleaning job...If you had stabilizer, gas was fresh..did you have the carbs off at all??
Dave
Dave
50% remember to charge their battery, and when we take the bikes out every single one of them starts without problems as long as there is battery power.
Some might take a some turns on the starter, but they all start, and continue to run. I don't think you will meet people in Norway that ever heard about gasoline stabilizers unless they've been to american forums or newsgroups.
So what is this magic stabilizer thing? Maybe we have them allready in our gas?
Senior Member
MotoGP
Joined: Sep 2006
Posts: 4,138
From: Austin, Tx
I think it might be the opposite - maybe you do not have all the bullshit in your gas that we have. From what I understand it's all the additives that "give up" "age" here's a stretch "percipitate" making these kinds of reversal agents required. If you don't have the additives - you don't have to reverse them.
Senior Member
Back Marker
Joined: Oct 2006
Posts: 224
Looks like a hi-jacking to me..
I think Nuhawk nailed it..it's the quality and junk in modern gas...it will not survive long if not used..the smell of stale gas will make you ill..Anyway back to the issue..still waiting to hear about how the bike was stored and if the carbs were off before problem..
Dave
Dave
Thread Starter
Senior Member
Back Marker
Joined: Apr 2007
Posts: 147
From: Minnesota
Yes, I used fuel stabilizer and stored the bike like I have for the 5 years I have had the bike. The carbs have not been off before or after the problem. The only thing that was off was the K&N filter which I "recharged" with the K&N Filter kit. So that could be the problem, but again, the bike was at the paint shop and I can't be positive that something didn't get into the tank while at the paint shop.
Out of my mind, back in 5
MotoGP
Joined: Nov 2006
Posts: 6,109
From: Skurup, Sweden
Humm, what kind of fuel do you have in US? My club store about 60 bikes every looong winter in Norway, and about as many as 2 of them drain their carbs. Some have empty tanks, but that's beside the point.
50% remember to charge their battery, and when we take the bikes out every single one of them starts without problems as long as there is battery power.
Some might take a some turns on the starter, but they all start, and continue to run. I don't think you will meet people in Norway that ever heard about gasoline stabilizers unless they've been to american forums or newsgroups.
So what is this magic stabilizer thing? Maybe we have them allready in our gas?
50% remember to charge their battery, and when we take the bikes out every single one of them starts without problems as long as there is battery power.
Some might take a some turns on the starter, but they all start, and continue to run. I don't think you will meet people in Norway that ever heard about gasoline stabilizers unless they've been to american forums or newsgroups.
So what is this magic stabilizer thing? Maybe we have them allready in our gas?
+1 on that... My regular yearly routine of storage is as basic as filling up the tank, and disconnecting the battery...
And if I remember to hook up the battery again it starts at the first push of the button every year... migth need some coaxing with the choke, but it fires...(Yes I did tear almost the whole bike apart one spring... Only to then remember that I hadn't reconnected the battery...
)
Thread Starter
Senior Member
Back Marker
Joined: Apr 2007
Posts: 147
From: Minnesota
Sputter at Full throttle FIXED!!!
Thanks Babelfish. You were right. Too much oil on the K&N filter. Took it off and cleaned it again and did not oil it. Put it back in, took for a test drive, and problem solved. Guess it was just starving for air at high rpms. WHEWWWWW! Glad that was the simple fix. I usually don't get that lucky.
Thread Starter
Senior Member
Back Marker
Joined: Apr 2007
Posts: 147
From: Minnesota
Finally found it...
Hey Hawkrider, got a question for ya.
So, my sputter at full throttle is fixed, but I finally found out what kind of jetting I have after doing some digging. Micron Jet kit with 180 front, 185 rear, needle set at 4th groove, and 48 Main Pilot. My elevation is 1010 feet above sea level.
Does this seem right?
So, my sputter at full throttle is fixed, but I finally found out what kind of jetting I have after doing some digging. Micron Jet kit with 180 front, 185 rear, needle set at 4th groove, and 48 Main Pilot. My elevation is 1010 feet above sea level.
Does this seem right?
Administrator
World Champion
Joined: Dec 2004
Posts: 105,287
From: Fulton, MO
Well, the Micron kit is made by Dynojet. I've no experience with them and their main jets are sized differently than Factory and Keihin. The needles are shaped differently as well. Hopefully someone with a DJ kit will pipe up and give you some good base settings. At first glance though the mains seem a bit small to me.
Thread Starter
Senior Member
Back Marker
Joined: Apr 2007
Posts: 147
From: Minnesota
Proper jetting
Ya know, the bike isn't running bad. It is just that you only know things are as good as what you currently have. So just wondering if the jetting seems off and maybe changing it (if incorrect) would give the hawk a new life I didn't know it had?
Senior Member
SuperSport
SuperSport
Joined: Dec 2006
Posts: 880
From: Victoriaville, Quebec, Canada
your setting is what I'm currently running, but since you have a K&N filter, I'll swap the 185 in the front and find a 190 for the rear. For the needle you mean 4 th notch from the slide end ?
Thread
Thread Starter
Forum
Replies
Last Post
