My 77 Cafe idf build

A forum for stories, pics and updates of your resto's. Be it a barn find, Grampas hand me down or a bike being brought back to it's former glory.If you are restoring it, show us your stuff!

Moderators: Brant, Sagebrush, Forum Moderators

Post Reply
dontwantapickle
Silver Member
Silver Member
Posts: 613
Joined: Fri Oct 13, 2017 9:26 pm
Location: Colorado

Re: My 77 Cafe idf build

#16

Post by dontwantapickle »

gregforesi wrote: Mon Jul 12, 2021 6:53 pm The OEM's are fine. They just don't run as well.
run as well as what?
Giving bad advice is worse than just saying "I don't know."
Olyclo
Zinc Member
Zinc Member
Posts: 41
Joined: Tue Nov 07, 2017 6:10 pm

Re: My 77 Cafe idf build

#17

Post by Olyclo »

gregforesi wrote: Sun Jul 11, 2021 10:06 am "It is however nearly unrideable as it pops and backfires until about 5000rpm and then it clears and pulls hard ( if I use full throttle )"

There is no mid-range circuit so the idle circuit must be rich enough to transition to the mains. The accelerator pump is a big part of that transition too. I have a pretty easy flowing system with the velocity stacks and (now) Delkevic exhaust. My settings are: 50 idle jets, 110 mains, 135 air correctors, 9mm of thread showing on the accel pump adjusters.
Your low speed mixture screws should be between 3/4 and 1 turn off the seats. You will get that with either a 47 or 50 idle jet.
The bike should idle with the butterflys open by just 1/4 turn on the idle adjusters. Any more than that and the progression holes start to get uncovered and can give you a false impression.
If the bike is falling on it's nose at 3000 - 3500 or something like that it's the accelerator pump. Crank it down to show more thread (less squirt).
My #1 problem was with Randakk's suggestion for the air correctors. You can see that I ended up a lot smaller than his. That was the result of a dyno run. The accelerator pump adjustment was trial and error.

So when I first started out I was getting way too much squirt from Accel pumps and it bogged. Then as it got to the top end it was getting way too much air through the air correctors and it was running really lean. Instead of buying a bunch of air corrector jets I invested in micro drills. The brass solders closed nicely and then I just drilled them to size.
Sent you a PM Greg, Thanks
77 Gl1000
Olyclo
Zinc Member
Zinc Member
Posts: 41
Joined: Tue Nov 07, 2017 6:10 pm

Re: My 77 Cafe idf build

#18

Post by Olyclo »

Greg I fitted 55 idle jets today ( the only size I had ) up from 47. The difference is incredible! Still far from perfect but rideable at least. Il order 52’s and try them out.
77 Gl1000
User avatar
lilleG
Lead Member
Lead Member
Posts: 6
Joined: Wed Jul 21, 2021 10:47 am
Location: Oslo, Norway

Re: My 77 Cafe idf build

#19

Post by lilleG »

Great looking bike! Well done!
Post Reply

Return to “Members Restorations and Projects”