Search found 753 matches

by chasbmw
Wed Mar 13, 2024 7:10 am
Forum: Post 1970 Airheads
Topic: EME Electronic Ignition
Replies: 17
Views: 6060

Re: EME Electronic Ignition

Just a reminder for everyone to check the resistance of all the components in the system. I have had issues with NGK plug caps that don’t conduct any spark, which may well have blown out a Dyna Mini coil, another Dyna Mini that failed, I fitted PVL coils, but got the part nos wrong so the low resist...
by chasbmw
Sat Aug 07, 2021 6:18 am
Forum: Post 1970 Airheads
Topic: Koni shock rebuild
Replies: 36
Views: 12189

Re: Koni shock rebuild

Anyone know of anybody who can rebuild a set of Konis in the UK?
by chasbmw
Thu Oct 15, 2020 8:45 am
Forum: Post 1970 Airheads
Topic: Upgrade to Floating Rotors - Save $$$ (How To)
Replies: 25
Views: 9506

Re: Upgrade to Floating Rotors - Save $$$ (How To)

EBC make good floating rotors for airheads , not expensive and they work well.

Much better than the replacement discs sold by Brembo, which have warped on my bikes
by chasbmw
Thu Oct 15, 2020 8:38 am
Forum: Post 1970 Airheads
Topic: Dyno tune.
Replies: 5
Views: 1304

Re: Dyno tune.

A 70 BHP RS will show around 55Bhp on a rear wheel Dyno, Shaft drive involves real losses in Power and I guess BMW tested on a bare engine, no alternator or starter, with the addition of some magic powder to get to headline figure of 70 Bhp
by chasbmw
Thu Oct 15, 2020 8:31 am
Forum: Post 1970 Airheads
Topic: Hoske
Replies: 12
Views: 2276

Re: Hoske

Keihan make some straight through silencers, ask for the Jim Cray specials, same price as the standard ones but loud and Jim showed some useful power gains.

In stainless
by chasbmw
Thu Oct 15, 2020 8:27 am
Forum: Post 1970 Airheads
Topic: Does this sound like solenoid?
Replies: 4
Views: 782

Re: Does this sound like solenoid?

I had similar issues and sounds, in my case it was due to a poor earth path on the relay, so unlatching the relay under load from the starter motor. The earth path runs via the neutral switch, replacing the neutral switch didn’t help so I used a jumper wire in the headlamp bucket to one of the earth...
by chasbmw
Wed Oct 28, 2015 6:20 am
Forum: Post 1970 Airheads
Topic: 1982 R100RS - Hit Pothole, Backfired and Died
Replies: 12
Views: 4101

Re: 1982 R100RS - Hit Pothole, Backfired and Died

90% of airhead electrical problems are down to poor connections at the starter relay.
by chasbmw
Wed Sep 09, 2015 5:49 pm
Forum: Post 1970 Airheads
Topic: Boyer ignition?
Replies: 7
Views: 2727

Re: Boyer ignition?

Boyer ignitions should be timed on the F mark. Don't worry about the actual revs, just set the Boyer on the F mark when the Boyer stops advancing. Ignore the S mark, especially if your Boyer is a Microdigital. Older Boyers like a healthy battery, they revert to full advance if the voltage drops belo...
by chasbmw
Sat Aug 29, 2015 10:36 am
Forum: Post 1970 Airheads
Topic: Brake Light switch on 1979 R65
Replies: 12
Views: 4909

Re: Brake Light switch on 1979 R65

Over in the UK we have annual inspections 3 years or over, inspections don't cost much and usually my vehicles pass without problems, though a failed catalytic converter on a small alfa was very expensive. I'm happy with the way the scheme manages to get rid of some mobile death traps. Funnily enoug...
by chasbmw
Sat Aug 29, 2015 10:28 am
Forum: Post 1970 Airheads
Topic: Ignition switch problem
Replies: 6
Views: 2652

Re: Ignition switch problem

Take a look at the Boyer site, and there is work around on the site, or alternatively google Boyer troubleshooting

Some earlier Boyers did this on BMWs.