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1981 Gs1000g CV main and primary jet size

  • Thread starter Thread starter Miff
  • Start date Start date
I had another go today, tried the old Piperx filters and boom she pulls full throttle.... I have 127.5 mains and stock primary's with 2 turns out on the air screw and second notch up from bottom on the stock needles.. she gets better the more I ride, it needs to be ridden now after been in my garage since October last year and see what happens, I let you know.
 
Miff said:
I had another go today, tried the old Piperx filters and boom she pulls full throttle.... I have 127.5 mains and stock primary's with 2 turns out on the air screw and second notch up from bottom on the stock needles.. she gets better the more I ride, it needs to be ridden now after been in my garage since October last year and see what happens, I let you know.
Click to expand...

What she needs is to have the proper maintenance performed (valves adjusted, timing set, proper jet installed, carbs cleaned and synced) before you ride her. Otherwise you may end up with less then a desirable ending.
 
JTGS850GL said:
If that's two turns out then they were never seated at the start. The screw heads would not be flush with the tower.
Click to expand...

JTGS850GL said:
Factory setting is closer to 1/2 turns out and then a anti-tamper plug is inserted on top. At 2 turns out it should still have plenty of room for the plug so being level with the top of the towers makes no sense. Something isn't right.
Click to expand...
If those were US-spec carbs, I would agree with you, but I think I have seen it posted here that carbs sent to other world markets did not require the anti-tamper plugs, so their 'towers' were not as tall. And I think there is a "1" missing from your post, the stock setting would be closer to 1 1/2 turns (maybe as much as 1 3/4).


Miff said:
I had another go today, tried the old Piperx filters and boom she pulls full throttle.... I have 127.5 mains and stock primary's with 2 turns out on the air screw and second notch up from bottom on the stock needles.. she gets better the more I ride, it needs to be ridden now after been in my garage since October last year and see what happens, I let you know.
Click to expand...
Just so you fully understand the different parts of the carbs, those are NOT "air screws".

They control the amount of a preset mixture that is admitted to the air, downstream of the throttle plate. Turning them out (anti-clockwise) will richen the overall mixture. If they were "air" screws, turning them that direction would admit more air, leaning the mixture.

Sounds like you have it set pretty close, which is something you can do with your adjustable needles. When we were "blessed" with the anti-tamper mixture screws, they also "blessed" us with but a single groove for the clip on the needle.

.
 
She is running a Boyer Bransden micro digital ignition that I fitted and set. The valves I checked and needed nothing....lol I sync the carbs using a Morgan carbtune after every strip, I'm very good at it as I own a Yamaha Venture trike....
 
Steve said:
If those were US-spec carbs, I would agree with you, but I think I have seen it posted here that carbs sent to other world markets did not require the anti-tamper plugs, so their 'towers' were not as tall. And I think there is a "1" missing from your post, the stock setting would be closer to 1 1/2 turns (maybe as much as 1 3/4).



Just so you fully understand the different parts of the carbs, those are NOT "air screws".

They control the amount of a preset mixture that is admitted to the air, downstream of the throttle plate. Turning them out (anti-clockwise) will richen the overall mixture. If they were "air" screws, turning them that direction would admit more air, leaning the mixture.

Sounds like you have it set pretty close, which is something you can do with your adjustable needles. When we were "blessed" with the anti-tamper mixture screws, they also "blessed" us with but a single groove for the clip on the needle.

.
Click to expand...
I'm gunna ride here for a day or too,, just to get a feel for her and see what she's like.
 
Good to hear. Now get the jetting right for those pods and you'll be set. The DJ kit will do you well.
 
Just an update. I have sorted the jetting/running issue, she now runs sweet. It has the stock pilot jet and 127 mains and raised the needle 1 notch above stock but had to dump the K&N style filters for the Piperx foamies...she wont pull cleanly on the K&N's, swapped them over twice....Problem now is a battery drain when lights are on.
 
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