shifting to late

when you shift to late are you greeted with a high pitched sound or a rev limiter? 1982 maxim 750

 

no rev limiter on these bikes you can rev them till they blow, and I can shift anywhere to redline with no odd sounds.

 

oh so the sound i here is what it almost sounds like a bloody waste gate and my rpm tach is too slow to keep up with me where would you shift if running a quarter mile?thanks for the response

 

Does valve float @ 12,500 count as a rev limiter ??

You would shift @ 9,500 unless the "pull" of your bike tapers off a little before that.

Never quite heard that sound - my bikes have 4 in 1's.

 

I short shift 1 most of the time because you are into the power of 2 already and I feel I get more out of it that way.

 

okay i guess my best bet is to get a better tach i thought i was shifting somewhere around 9000 rpm but this is my first bike and for all i know i was shifting way to high if anything i bet im getting as xj wizrd sais valve float because it does stop pulling then pulls all the way to through the next gear till the same rpm. Will valve float cause you to loose power untill you shift ?

 

shifting at 9000 all the time on the road would be fairly hard on the bike id imagine, everyday i ride i do venture into the red but for normal riding i change up just between 3000- 5000 RPM, just cause they can rev high doesnt mean you have to flog it, but if i was on the drag strip , i would be into 2nd sooner than later and changing around 10000RPM, at these higher revs you want your bike to be in a well tuned state , just my thoughts

 

I agree

Also Hash if your tach is not keeping up you may be able to fix it by striping th gauge down, clean, and regrease it,

 

Valve float will get your pistons very intimate with the valves in a big hurry if you are not carefull.

You are well into the powerband on every gear by 5k. The only reason to run it up to redline would be in the final gear. Redlining every gear is just wasting time, and abusing the motor.

Ghost

 

ok thanks guysno i dont redline it all the time most of the time i ride slow and enjoy the ride only time i give it is when im almost home or in a race i love the kick it now gives while well tuned thanks for all the help

 

Correct me if I'm wrong, but I understood the powerband to be between Peak Torque and Peak HP. Peak torque's supposed to be around 6 or 7k rpm, so that would mean you haven't even gotten into the technical power band until then.

I agree that there is a noticable increase in "pull" at 5k rpm, but the "Rocket Ship" effect really doesn't start until 7k. These engines are quite peaky.

Valve float shouldn't be an issue until you are in the redline. I know I rarely hold on that far (bike seems to get a little too "jumpy").

As for the OP, fix the tach so you don't run too deep into the redline without knowing. Test the compression? Just to make sure it's there? Not really anything that should be making any kind of sound unless something's wrong.

 

I would agree with MiGhost. Valve float not only sounds horrible your engine thinks it's horrible too. No need to go into the red on any engine.

 

On the XJ550R (Seca) peak HP is at 10K rpm; peak torque is at 7500.

Once you're moving quickly, the bike still accelerates quite briskly between 8K and 10K. Since peak HP is AT redline, I don't feel the least bit abusive hitting redline on (frequent) occasion. The bike seems to thrive on it. I sure do.

 

Red-lining does sound a bit abusive for street use, but I think the motors can take it.
Member "worldsfastestxj550" claimed 14,000 RPM with stock rods, stronger valve springs, and most likely a balanced assembly. (although he eventually destroyed his motor).

 

i dont know mr rpm doesnt work and im trying to figure it out yesterday i took it out for a ride with new tires and shift just before it would loose tork in all gears and once i got to 3rd it sliped like a bitch and bogged down think my deisel oil was a bad idea

 

that being said my clutch was slipping and the nasty sound i was hearing was my plated sliping like crazy and i was probably shifting around 7k because it torques like crazy the all of a sudden the noise and it stops torking and engine just revs up so due for sum plates or cluych springs a job i havnt done on these should be fun