I got a 77 kz650 but it wont go faster then 85

Valve adjustments are the most neglected item on the list. It won't run for SHT with valves that are too tight. Yeah, it takes time and money to do but can last 3000 miles until the next one.
Steve

swest wrote: Valve adjustments are the most neglected item on the list. It won't run for SHT with valves that are too tight. Yeah, it takes time and money to do but can last 3000 miles until the next one.
Steve

Especially on the 650's with the under bucket shims, it's not a job for the faint hearted and many never felt the need to pay someone to do it. Once the engine is broken in and has some miles on it the valve clearances usually change very little, but I wonder how many bikes out there have never had the valves adjusted including the first time they should have been checked?

That was always the first thing I checked when a bike came into my bay. More often than not the owner was complaining about the carbs. :whistle:
Steve

Many ride and drive on the basis if it's still running, keep going, and some I know even ignore the noises the poor thing makes trying to tell them something's wrong, they don't quit until the vehicle does and then complain it's a POS because it left them stranded and it's going to cost $3k to fix it, even though the original problems was a $10 hose or $20 water pump.

Sometimes I feel that knowledge can also be a bad thing. you can get so paranoid about everything that might need adjusting, what can go wrong and what sort of loads hogging the red line might cause that you can't enjoy riding the thing any more . Sometimes I wish I was 18 again, where even though I was big on maintenance, once in the saddle I never gave those things another thought - two throttle positions - closed and wide open

I do lawn & garden equipment for a living and I can tell you about 1 in 1000 home owners bring their mower in for
routine maintenance we see it when it don't start.

I do the big commercial mowers and they get the maintenance
because I do it when their in for other issue's.
A lot of the equipment I work on I've work on for year's and know when it need's it so
I just do it and add it on the work order.

my 750 LTD Twin seems to run well enough but I've never taken it over 70 even though the throttle goes higher.

Mine is an '83 and not restored or rebuilt so I'm reluctant to "push it" too far. Thats slightly over 5,000 RPM in 5th gear

I'm fortunate in that the previous owner had everything wired-tight, as it were. 4,000 miles later and she still runs smooth.

Ive cleaned the air filter 1x (it didnt need it) and I change the oil every 2K miles. I recently lubed the clutch cable.

Pedal faster! ....sorry no seriously I had 77 kz 650 seems like I got close to a hundred it had a Kerker 4 to 1 pipe on it . That is at mile high altitude. Loved the bike ... Good luck.

Wyliecoyote wrote: Pedal faster! ....sorry no seriously I had 77 kz 650 seems like I got close to a hundred it had a Kerker 4 to 1 pipe on it . That is at mile high altitude. Loved the bike ... Good luck.

That would be my experience with mine also at altitude, it's pretty low geared with the stock gearing and so hitting 80 is easy enough with seemingly plenty in hand. Just running it up through the gears can get you to a good speed, like most of my bikes going too fast is usually my problem, certainly since 1978 when I stopped riding a Honda 175

Has been discussed not too long ago and 120 should be no problem so you defently have problems....... and most of us are getting closer to 40mpg give or take a little.

Willy1803 wrote: My bike wont go past 85 mph an sucks down gas like its a truck....

Possible loose main jet(s).

Perhaps the main jets have been "drilled out." :pinch:

Good Fortune!

Are you sure it's not a govt. installed speed restrictor? ha!