Hey guys, I just finished the valves on my 1977 GS750 and I've triple checked that they're all in spec now. Anyways, when I bought the bike it had pod filters and I had read that the bike runs terrible with those so I bought a stock airbox and put a new uni filter in it. I installed it all the right way, using the manual as my guide.

Now, before I did the valves and had the pod filters my bike ran fairly well. Like you could tell it wasn't running on all 4 cylinders and it had low compression (due to the valves all having no gap), but it ran. Once I finished the valves I turned it on before adding the filter to make sure it ran well, which it did. So I proceeded to install the stock filter in replacement of the pods. Now it won't rev over 3-4k rpm. I pulled the side covers off while it was running and immediately I could hear a difference in the way the engine ran. It runs fine without the covers, but that's cause it bypasses the actual filter. I tried adjusting all the carbs but nothing I did seemed to do any help with the filter installed.

I'm at a complete loss with what this could be. Any suggestions will help. I need this bike running cause I'm selling my car soon for a truck and I'm gonna need the transportation while I'm in between vehicles.

Thanks guys!

 

Man I’ve got a 1980 gs850g and I took the quad carbs off and bought dual vm34’s from Murray’s carbs he jets them for your year and model bike bike goes twice as fast and never any choking or cold starts !! It was like my bike said thank you as soon as I cranked it !!!!