79 gs750 problem at 80mph

[wilfybongo]

hello, i have recently bought a 79 gs750. its a cracker but for some reason will not rev up right, its mint up to 80mph then its as if its restricted, sevealy stumped, any heads up would be grand, cheers chaps.

[cleiper]

A few things worth the checking but bear in mind I have a 1980 GS1000ET;
Air filter clogged.
Ignition timing.
If it has CV carbs make sure the airfilter box is standard and not been 'opened up', if not CV's forget it.
Vapor lock in petrol tank, try running it with the fuel cap off (Not with a full tank of coarse) and see if it improves.
Try taking off the petrol pipe and make sure you get a good flow into a jar etc to make sure their is no fuel starvation, blocked petcock filter, kinked pipe etc
Are all exhaust headers getting hot, make sure its not just running on 3.
Check spark plugs for colour, this gives an indication what might be going on.

Im sure guys with the 750's will give ya more pointers.

Good luck.

Cheers.

[7981GS]

Condensers for the points have gone South perhaps?
Replace the points and condensers and report back.

Daniel

[BassCliff]

Greetings and Salutations!!

Hi Mr. wilfybongo,

Sometimes it's a process of elimination. Go through the maintenance lists in your "mega-welcome" and chances are you'll be golden.

Let me dump a TON if information on you and share some GS lovin'.

I just stopped by to welcome you to the forum in my own, special way.

If there's anything you'd like to know about the Suzuki GS model bikes, and most others actually, you've come to the right place. There's a lot of knowledge and experience here in the community. Come on in and let me say "HOoooowwwDY!"....

Here is your very own magical, mystical, mythical, mind-expanding "mega-welcome". Please take notice of the "Top 10 Common Issues", "Top 15 Tips For GS Happiness", the Carb Cleanup Series, and the Stator Papers. All of these tasks must be addressed in order to have a safe, reliable machine. This is what NOT to do: Top 10 Newbie Mistakes. Now let me roll out the welcome mat for you...



Please click here for your mega-welcome, chock full of tips, suggestions, links to vendors, and other information. Then feel free to visit my little BikeCliff website where I've been collecting the wisdom of this generous community. Don't forget, we like pictures! Not you, your bike!

Thanks for joining us. Keep us informed. I will put you on my prayer list.

Thank you for your indulgence,

BassCliff