need more performence out of 750

[Jethro]

I often ride with a guy on a modded ZX1100, Andy on his FZR, Fi on his hopped up GSXR, and another guy on a Blackbird... the only thing I need to do is pay real close attention to what they are doing. If they go to pass a line of cars and I miss a second or two, they pull away real fast. But if I pay real close attention (with my eyes and ears) and I react as quick as possible, I am right there the whole time.

If a good rider on a late model 750 wants to lose you, it will happen. They are much faster, lighter and effecient than our old GS's. You could spend a couple thousand dollars on hopping up the motor, but is it worth it? If it's that important to you, maybe find a newer sportbike.

But remember- someone is always going to be faster than you.

[odl777]

the speed is not so much important to me i just want to show the newer guys how good of bikes these are. I have raced a few guys on rockets and they were a little impressed after i told them what year it was. I just love it when one them over revs or misses a gear and i stay even closer on there tale.
alot the young guys on rockets cant even work on them so they dont hardly have any mods and they pay others to do there work. im 20 and have done all my work top end rebuild, welding, modifying, painting and upholtstery. all togeather with the price of bike and all mods it cost me a toal of about 1700.00. Can you beleive my parents still wont let me bring it to college.

[KEITH KRAUSE]

The old 2 valve bikes just can't make the power of todays rockets. Not cc for cc. Handling has improved a lot too.
You can still have fun on your bike and surprise someone now and then as you've said.
What I can say is to be sure the jetting's correct, among other things, to get the most out of the bike and for it to run its best.
You mention the mains are 118. If you have the stock VM 26 carbs, stock mains are Mikuni 102.5. Also, Mikuni doesn't make 118, just 117.5. and increasing/decreasing in 2.5 increments. So I'm guessing you may have some DJ mains?? Seems a little lean to me because a 118 DJ jet is roughly the same as a 107.5 or 110 Mikuni jet. Different makers number their jets by different methods. That means you've only increased the main about 1 full size up. Not enough for pods and a pipe.
If the bike has good compression and is in good tune otherwise, it should use something closer to 120 to 125 Mikuni mains, depending on pod filter brand and pipe flow quality.
Also, and even more important to general riding, you need to raise the jet needles if it hasn't been done yet. If their e-clips are still in the 3rd position, you're lean for sure. Then you'll need to richen the pilot circuit too, but may get away with only pilot fuel screw adjustments.
I mention this stuff because you only mention changing the main jet, a common mistake by many. All 3 jetting circuits must be richened and the carbs vacuum synched after. Before any re-jet, check ignition timing, valve clearances, etc.

[Billy Ricks]

My bike is a little newer than yours but will keep up with most newer bikes until up around 125 or so. There was one guy on a Gixxer, not sure what size, that was on my tail on a freeway entrance ramp. I hammered the throttle and left him sitting. It wasn't until my bike ran out of legs that he caught me. As he pulled along side he looked a little dismayed that my old 700 had just pretty much outrun him.

[odl777]

thanks for the reply i had no idea about the dj thing. Lokks like im going to have to do some adjusting to the carb. on checking the valve clearence do i just use a feeler guage and measure the beearing and the shim and if it is off do i get new shims.
I have a bandit titanium header on the bike with no muffler been wanting to get a little slip on tip like the ones on race bikes. the pods are a cheaper kind not k and n but seem to work fine. thanks for the tips and if you have any more let me know. wish i could find someone in the nm area to help me out with this stuff . thanks again.

[odl777]

My bike is a little newer than yours but will keep up with most newer bikes until up around 125 or so. There was one guy on a Gixxer, not sure what size, that was on my tail on a freeway entrance ramp. I hammered the throttle and left him sitting. It wasn't until my bike ran out of legs that he caught me. As he pulled along side he looked a little dismayed that my old 700 had just pretty much outrun him.

thats what i like to hear thats why when i race guys i say lets just go to a 100. my bike probly barley tops out at 125 mph but thats fast enough to die so thats fast enough for me.

[Billy Ricks]

thats what i like to hear thats why when i race guys i say lets just go to a 100. my bike probly barley tops out at 125 mph but thats fast enough to die so thats fast enough for me.

Here's a pic of my bike. It's been modded a bit so it handles and runs stronger than stock. A new round of mods will begin as soon as some parts arrive.

[KEITH KRAUSE]

Gettin' a little late so I'm signing off, but I'm sure you can do a search for the correct factory procedure on valve clearance adjustments on your '79. Yes, you replace shims. You'll need the depressor/shim removal tool.
Do a search, if you can't find anything, I'm sure someone will help soon.

[odl777]

thnks for the help im sure ill find what i need, but thanks again.

[KEITH KRAUSE]

Sorry, forget how to post a link.
Found what you need about valve clearances.
Do a search. "Tech section", Thread titled "Measuring valve clearance". By "PTM".That should help you out.

[flyingace]

You are being stupid

The GS engine is a 2-valve, roller bearing engine built more for durabililty than speed. It's heavy and will never have the power to weight of a modern crotch rocket. It's true value is the fact that it still runs well 27 years after it was built. And you can actually change the oil without taking the bike apart.

I would save the thousands it would require to make it competitive and buy a used crotch rocket - best of both worlds.

PS - Don't let others decide what you think is cool.

[odl777]

I know what cool is, and i think i could put a gsx 1100 motor in my bike and supe it up a lil and smoke rockets for under 2,000. i just wanted to know if i could get anything else out of my 750.

[odl777]

Sorry, forget how to post a link.
Found what you need about valve clearances.
Do a search. "Tech section", Thread titled "Measuring valve clearance". By "PTM".That should help you out.

YOU THE MAN KEITH
thanks alot for all your help cant wait to go home this weekend to start wrenching. thanks again have a good one.

[KEITH KRAUSE]

OK. Read different posts. You'll pick up a little info or tips here and there.
Too add to those posts, if it wasn't mentioned...
Turn the crank with the 19mm nut, not the smaller end bolt.
You'll need a feeler gauge that measures down to .03mm. If you must force it in, it's too tight.
Always better to go on the loose side instead of tight. If you get into that "tight .03 vs loose .08" problem we all experience from time to time. "Fat shims" may be found to help you out. They have an "X" with the number. They are generally.02mm thicker than the standard shims that increase/decrease in .05mm increments.
You'll need the depressor tool and I recommend a new gasket and 4 new "half moon" rubber gaskets. Leaks suck. Be careful to line up the new cover gasket exactly before torquing. Torque uniformly.
Apply a very light film of bearing grease to the new cover gasket. It doesn't hurt the sealing quality and the gasket will come off easily the next time. Be very careful if you have to razor blade any old gasket material off the aluminum cover/head.
While checking each clearance, note the shim size. If it was placed in correctly (number side-down) you'll be able to read it. Use some verniers or other measuring tool to verify their thickness. After checking all 8, they can sometimes be swapped around and save you a little. Some shops have shims available, some not. Used ones are fine. They wear very slow.
Some shops will even swap for free. Others want maybe $10/ea.
Be sure you get Suzuki shims. 29.5mm cross diameter. Kawa's use 29mm and aren't compatible.
Check on a STONE COLD ENGINE. Not just a few hours.
Hope this helps.

[odl777]

Big thanks again i'm going home this weekend and hope to get the valve clearences checked and carbs synced and jetted. Cant wait till i get her back on the rode its been about 2 months since her last ride. thanks again have a good one.