1982 gs850 wont rev past 5.5k rpms when in gear

[hadenator124]

Hey guys just finally rebuilt my old 1982 gs850l shes a beaut. she runs great but the only problem i have left is, when i romp on the throttle and try to bring her past 5k-6k rpms its almost like bike is red-lining, and wont go any higher, its just stuck, and you can hear the engine making a red-line like noise. I already went through the carbs but i wouldnt rule them out. So what do you guys think? could it be a valve issues? thanks everyone.

 

[tom203]

," and you can hear the engine making a red-line like noise. "

what does this sound like? And what did your rebuilding involve? Did you check valve clearances and cam to crank timing while you were at it?

 

[Guest]

Is your airbox installed?

 

[eil]

Are you sure your tachometer is working?

 

[gustovh]

Check the spacing between the cams, I bet they are a tooth off.

V

 

[Guest]

Check the spacing between the cams, I bet they are a tooth off.

V

Very possible!
I was also wondering about the condition of the Igniter.

 

[Wingsconsin]

Are you sure your tachometer is working?

This was the problem for my '83 GS850L - The Tach was way off - I was screaming along and it only would read 6K ---?
A new Tach fixed that (but it took me 2 tries to source one that worked properly)

 

[hadenator124]

Thanks Guys i will check all of the above! wont see the bike for about a month back at school but ill send you guys and update!! thanks again

 

[Wingsconsin]

Watch the Tach starting at the 2:40 mark -- nearly 80 MPH in 4th and 5000 rpms...

 

[Dicke]

Did you repack the exhaust?. I did mine a few weeks ago and over did it. Thing would not rev past 5k.

 

[GSCafe]

Did you repack the exhaust?. I did mine a few weeks ago and over did it. Thing would not rev past 5k.

Did not know that could happen. I pack mine using absolutely as much pack as I can get in there. I have to use a mallet to get the cap back on. Never noticed any rpm issues but maybe mine is different because of the old slide carbs.

 

[salty_monk]

I had that on a 1000G - Was the ignitor. A Dyna S fixed it.... You have the electronic advance on the 82 though I think. Not sure if you can re-fit the mechanical advance to that model otherwise you'll need a Dyna 2000 or one of the other equivalents.

 

[cornishgs]

Looking at your film clip it looks to me your tacho is not working

.sounds like she is reving well.

Try a different tacho from fleabay maybe . before you over rev it!!

 

[gustovh]

I just watched your video, there is no way you were doing 80 mph at 4 grand, replace your tac.


V

 

[hadenator124]

Whatcha guys think about the CDI box? and whats repacking the exhaust never heard of that before. Im currently getting a carb kit to just run completely through them, start simple before i start ripping the thing apart.

 

[hadenator124]

Also when i was researching the bike, it says the main jet size was #115, but when i took the carbs apart they were all #112.5, but i think i remember when i bought the bike off the guy he said he swapped carbs to see if that was the problem but it kept happening?

 

[JTGS850GL]

Yep, 82 GS850 should have had 115 mains. Sounds like you have carbs from a GS750. Good chance the needle and needle jets are wrong as well. Sounds like you're going to need to inventory everything in those carbs. If you find the need, I do have a complete set of parts(mains, needles, needle jet, Pilot jets for an 82 GS850. PM me if you do need them.

 

[hadenator124]

yeah thats definitely possible so i have a complete carb kit for an 850, you think i could convert it to an 850 set up or should i start looking for new carbs?