Search found 12 matches

by Gurstang
Sat Sep 01, 2018 10:11 am
Forum: Post 1970 Airheads
Topic: R75/7 Front Fork questions
Replies: 4
Views: 1383

Re: R75/7 Front Fork questions

I finished the fork rebuild. What difference it makes. The 2nd leg wouldn't even drain after I removed the nut and pulled the piston out of the lower leg. There was so much material in there from the deteriorated parts. Now I can use the side stand without the bike tipping over, since it will now sp...
by Gurstang
Sat Aug 18, 2018 5:48 pm
Forum: Post 1970 Airheads
Topic: R75/7 Front Fork questions
Replies: 4
Views: 1383

R75/7 Front Fork questions

I am going to do a rebuild on my forks. They are not smooth, have sticktion and make springy sounds. When I compress them off the motorcycle, and they spring back, it sounds like the fluid is cavitating. I have one of the forks apart, I have not taken either end off of the damper rod. My Haynes manu...
by Gurstang
Sat Jul 28, 2018 3:54 pm
Forum: Post 1970 Airheads
Topic: Syncing carbs R100s
Replies: 15
Views: 8118

Re: Syncing carbs R100s

I need to sync my carbs as well. I was going to try it building a manometer as linked here: http://www.powerchutes.com/manometer.asp I believe my vacuum ports are on the side. I haven't tried to remove the screws yet since it looks like it will be a pain. Is the shaft I have marked here in red part ...
by Gurstang
Tue Jul 10, 2018 8:26 am
Forum: Post 1970 Airheads
Topic: Tank repair.
Replies: 9
Views: 2539

Re: Tank repair.

My tank was real bad. I took the tank for my 75/7 to a local guy to clean and paint the inside. That was a couple years ago. I put gas in it a couple weeks ago and there are about 2 dozen bubbles forming on the outside. This is with 1 gallon of gas and letting the tank site and hang in different pos...
by Gurstang
Sat Jul 07, 2018 7:51 am
Forum: Post 1970 Airheads
Topic: 1977 R75/7 Started today after 14 years. One cylinder not working
Replies: 9
Views: 2073

Re: 1977 R75/7 Started today after 14 years. One cylinder not working

The main passage through the idle jet was blocked.

That passage is so tiny, I can't see light shine through it even on the working jet.

Thanks for the helpful suggestions.
by Gurstang
Sat Jun 30, 2018 9:20 am
Forum: Post 1970 Airheads
Topic: 1977 R75/7 Started today after 14 years. One cylinder not working
Replies: 9
Views: 2073

Re: 1977 R75/7 Started today after 14 years. One cylinder not working

swapped sides with the carbs and it is definitely the carb. I took the idle jet and idle adjustment screw out and made sure they were clean. Blew air into all the passages. I figured out that I had the choke valves turned 180 degrees wrong. Fixed that. Chokes have an affect now. I still have the pro...
by Gurstang
Mon Jun 25, 2018 10:04 pm
Forum: Post 1970 Airheads
Topic: 1977 R75/7 Started today after 14 years. One cylinder not working
Replies: 9
Views: 2073

Re: 1977 R75/7 Started today after 14 years. One cylinder not working

Check for a plugged pilot (idle) jet on the right carburetor. It's a tiny passage and it doesn't take much to clog it. Take the jet out to do so. Drop the bowl and use a flat blade screwdriver. Also check the valve clearance. If too tight, they may not seal at low revs but might be adequate at high...
by Gurstang
Mon Jun 25, 2018 10:18 am
Forum: Post 1970 Airheads
Topic: 1977 R75/7 Started today after 14 years. One cylinder not working
Replies: 9
Views: 2073

Re: 1977 R75/7 Started today after 14 years. One cylinder not working

so start off with the basics. compression check. Valve adjustment. Also, I believe the Dyna has separate pickups for each cylinder. When you check the timing, do you get a single image, or is it split. One cylinder might be "3 degrees" out while the other could be much more (not even show...
by Gurstang
Sun Jun 24, 2018 11:10 pm
Forum: Post 1970 Airheads
Topic: 1977 R75/7 Started today after 14 years. One cylinder not working
Replies: 9
Views: 2073

1977 R75/7 Started today after 14 years. One cylinder not working

After many months of rebuilding I started my R75/7 today. The left cylinder seems to work great. The right one not so much. I have to pull up on the throttle cable at the carb, to probably about 1/2 throttle before it will fire. I have rebuilt both carbs. I did not replace the rubber seal on the mai...
by Gurstang
Sun Jun 24, 2018 10:55 pm
Forum: Post 1970 Airheads
Topic: 1977 R75/7 sat for for too long
Replies: 13
Views: 4378

Re: 1977 R75/7 sat for for too long

• Rings will be an additional $100 • Top end gaskets are ~$80 • Battery $100 • Carb rebuild kits $100 • Front brake rebuild kits and hoses $100 • Your photo does not show a seat ($150-300) • You may have additional unseen engine damage • Don't forget tag and insurance • Don't forget helmets and saf...