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Hi
Can any one help with a problem I have with #3 running rich? Thirty odd years ago I bought a GS 750 E , 1979 reg. I’ve spent most of my life moving around so have not really had a chance to work on her, until now. When I first bought her she was standard apart from a 4 into 1. The mists of time prevent me from recalling if there was a standard air box or K&N filters. If I had to stake my life, I would have to say there was an air box. Any way, I do know the engine ran as sweet as a nut and all four plugs were a nice tan colour.
Then came that fateful day when I decided to grow the engine up to an 850! The following is my shopping list from 30 odd years ago: GS 850 block, head gas flowed, slightly wilder cams, those pesky mists of time again, I can’t remember what type/stage of cams they are. I do know I was told I should be able to still use standard timing. And K&N filters. The carbs are the standard VM 26mm round slide Mikuni. The exhaust is a 4 into 1 Eagle. The setup of the carbs is as follows: the needle is fourth notch down from the top, pilot jet #10, main jet #110, fuel mix screw 1.5 turns out, pilot air screw 1.5 turns out. I junked the points for Dyna S and new Dyna coils, 3 ohms
I’ve balanced the carbs with mercury gauges, blown all air ways with an air line, checked valve clearance : but have not degreed cams, the fuel tap diaphragm (which has been replaced) is still operated by the breather tube from number 3 carb. The other breather tubes from 2 and 4 are not connected to anything as there is no air box. The state of the plugs are: #1,#2,#4 are just about a tan colour, #3 very sooty, not wet just very sooty. I’ve swapped HT leads for 2 and 3 still no joy. The old girl fires up pretty much first stab of the button, once fully warmed settles down to a steady idle. Here’s my problem, from idle if you blip the throttle the revs hesitate to pick up, almost like she’s being swamped with fuel, then she clears and the revs pick up nicely. On the odd occasion if you grab a hand full of throttle from idle she can die altogether.
From reading the threads on your site I guess I’m just going to have to bite the bullet and degree those cams. I just wonder if I might be better off re-fitting a standard air box as well.
Livy
Can any one help with a problem I have with #3 running rich? Thirty odd years ago I bought a GS 750 E , 1979 reg. I’ve spent most of my life moving around so have not really had a chance to work on her, until now. When I first bought her she was standard apart from a 4 into 1. The mists of time prevent me from recalling if there was a standard air box or K&N filters. If I had to stake my life, I would have to say there was an air box. Any way, I do know the engine ran as sweet as a nut and all four plugs were a nice tan colour.
Then came that fateful day when I decided to grow the engine up to an 850! The following is my shopping list from 30 odd years ago: GS 850 block, head gas flowed, slightly wilder cams, those pesky mists of time again, I can’t remember what type/stage of cams they are. I do know I was told I should be able to still use standard timing. And K&N filters. The carbs are the standard VM 26mm round slide Mikuni. The exhaust is a 4 into 1 Eagle. The setup of the carbs is as follows: the needle is fourth notch down from the top, pilot jet #10, main jet #110, fuel mix screw 1.5 turns out, pilot air screw 1.5 turns out. I junked the points for Dyna S and new Dyna coils, 3 ohms
I’ve balanced the carbs with mercury gauges, blown all air ways with an air line, checked valve clearance : but have not degreed cams, the fuel tap diaphragm (which has been replaced) is still operated by the breather tube from number 3 carb. The other breather tubes from 2 and 4 are not connected to anything as there is no air box. The state of the plugs are: #1,#2,#4 are just about a tan colour, #3 very sooty, not wet just very sooty. I’ve swapped HT leads for 2 and 3 still no joy. The old girl fires up pretty much first stab of the button, once fully warmed settles down to a steady idle. Here’s my problem, from idle if you blip the throttle the revs hesitate to pick up, almost like she’s being swamped with fuel, then she clears and the revs pick up nicely. On the odd occasion if you grab a hand full of throttle from idle she can die altogether.
From reading the threads on your site I guess I’m just going to have to bite the bullet and degree those cams. I just wonder if I might be better off re-fitting a standard air box as well.
Livy
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