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Bike bogs down at high rpm's

  • Thread starter Thread starter Splittie
  • Start date Start date
S

Splittie

Guest
On my way to work yesterday, I noticed that when I went to pass a car my bike was very sluggish.:-k
I own an 89 750L and it has been running pretty good for the last three months or so.
As I rode the rest of the way to work, I tryed in all gears to rev it up and when I would get about 5-5.5k rpm it would flatten out/bog down.
Does this sound like a carb problem? (This is my guess)
Should there be adjustments made or is a carb cleaning in order?
Thanks for any info
 
Lots of possible causes. Top of the list is fuel starvation. Is there a kink in your gas line.... dirty petcock filter or inline fuel filter...
 
Zook said:
Gas cap vent partially clogged?
Click to expand...

By the way, I have noticed a 'sucking' sound coming from the gas tank when it gets hot.
Is this normal??
Could this be my problem?
I would imagine if I run it with the gas cap off and it doesnt act up, this is the problem?:-k
 
doctorgonzo said:
Lots of possible causes. Top of the list is fuel starvation. Is there a kink in your gas line.... dirty petcock filter or inline fuel filter...
Click to expand...
Fuel line not kinked-haven't checked petcock yet-no inline filter
 
Splittie said:
By the way, I have noticed a 'sucking' sound coming from the gas tank when it gets hot.
Is this normal??
Could this be my problem?
I would imagine if I run it with the gas cap off and it doesnt act up, this is the problem?:-k
Click to expand...

Sounds like you're on the right track.
Run it with the cap open. Yes, you are correct if it doesn't act up that is the problem.
 
Flip the cap over and take a look at the outer edges. There should small slit openings all the way around the perimeter. Attach the small red hose that comes with a can of carb cleaner and spray in to each one of those slots until no rusty color comes out. Be sure to wear gloves and safety goggles. you should also notice that the center of the cap has a housing with two very small Phillips screws. Take that hosing off and clean everything inside there. Turn the cap right side up and stick the end of the red carb cleaner hose in to the key slot and spray that direction also. Do all that and it should be clean as a whistle.

Good luck.

Don
 
don_gibb6512 said:
Do all that and it should be clean as a whistle.
Good luck.
Don
Click to expand...
Well it isn't the fuel cap. I took the whole thing apart last night and cleaned it all up.
On the way to work today, I kept on the throttle and got it up past the 6k range and once I did the power kicks in!?!?!?:confused:
So I have a flat spot in the 5k-6k rpm range.
WHAT NOW!?!?
 
chef1366 said:
If it's not fuel related that's the first sign of a failing igniter.
Click to expand...
Hey Chef,
You feel like coming up here to Lemoore and working on this bike for me???:o
Seriously though, is there any other troubleshooting I can do before replacing the igniter?
I am looking at giving the carbs a good cleaning this weekend to see if that will help.
I am still able to keep up with traffic on the freeway, so I am going to ride to and from work for the rest of the week.
 
I had a similar problem, for me it was restricted fuel flow. I took the petcock apart and cleaned it up, I also re routed the vacuum line for the petcock. If the vacuum to the petcock is bad, you won't get any fuel. Rebuilding the carbs is also a good idea, but be careful. The intake boots that the carbs fit into have a tendency to crack one they get old. New ones cost $35 a piece from the Suzuki dealer.
 
Ok so I am on my way home from work and my bike died on me.
I checked the fuses and two of them were blown.
I changed them out (Once my wife came and picked me up)and tried to start it, but all it did was crank.
I pulled the plugs one at a time to check for spark and it was there.
After cranking it and choking it for a bit, it started up, buuuuttt the right two (3&4) cylinders weren't firing. The bike was running crapy and the two headers (3&4) were still cold and (1&2) were hot.
Any ideas???
 
Last edited:
Splittie said:
Ok so I am on my way home from work and my bike died on me.
I checked the fuses and two of them were blown.
I changed them out (Once my wife came and picked me up)and tried to start it, but all it did was crank.
I pulled the plugs one at a time to check for spark and it was there.
After cranking it and choking it for a bit, and it started up, buuuuttt the right two (3&4) cylinders weren't firing. The bike was running crapy and the two headers (3&4) were still cold and (1&2) were hot.
Any ideas???
Click to expand...
Quite possible what ever took your fuses out took a coil out with it? Or maybe the coil itself took the fuses out. Bust out the multimeter and start testing. Check the stator and RR too, as a overcharge could have started the whole process i suppose.
 
Thanks Kid,
The debate begins--Tomorrow I will drive my gas guzzling 4x4 Suburban to work, then after I will pick up gaskets that came in today for my 75 CB750 and come saturday one of these bikes is gonna get on the road come monday.
Thanks for the info;)
 
Splittie said:
Thanks Kid,
The debate begins--Tomorrow I will drive my gas guzzling 4x4 Suburban to work, then after I will pick up gaskets that came in today for my 75 CB750 and come saturday one of these bikes is gonna get on the road come monday.
Thanks for the info;)
Click to expand...
Yanno, and this is just a theory, but if you were experiencing that bogging prior to all of this happening, its possible that your coil was the cause, and when it finally bit the dust, it caused this other stuff to blow too. I would start at the battery, then the rest of the charging system, and work my way around the ignition system to see whats going on. Its possible you have a short or an open causing this too.
 
TheCafeKid said:
its possible that your coil was the cause, and when it finally bit the dust, it caused this other stuff to blow too.
Click to expand...

Would I still be getting spark at the plug if the coil(s) is bad?
I pulled the plugs to check for spark and it was there.
 
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