Search found 1223 matches

by barryh
Sat Feb 20, 2021 6:45 pm
Forum: Airhead Q&A's
Topic: Lester wheels
Replies: 23
Views: 396

Re: Lester wheels

No better place to save weight than the wheels. You get the double advantages of less total vehicle weight and less rotational inertia which improves acceleration and braking, then there is less unsprung weight into the bargain.
by barryh
Sat Feb 20, 2021 11:36 am
Forum: Airhead Q&A's
Topic: Lester wheels
Replies: 23
Views: 396

Re: Lester wheels

What the Lester advert doesn't mention is that they are heavier than spoked wheels by a couple of pounds but then so are snowflakes. If I had some spoked wheels in nice condition I wouldn't swap them for alloy wheels on weight grounds alone never mind what they look like. You might just get the incr...
by barryh
Thu Feb 18, 2021 9:15 pm
Forum: Airhead Q&A's
Topic: Oil question.
Replies: 14
Views: 354

Re: Oil question.

There are numerous suggestions as to the why's of this situation but none I can look at and say "Yes that's obviously the reason" I don't have enough information on synthetic gear oil but with engine oil there is much less reason to fear synthetic than there used to be. And that's because the vast ...
by barryh
Thu Feb 18, 2021 10:37 am
Forum: Airhead Q&A's
Topic: Oil question.
Replies: 14
Views: 354

Re: Oil question.

Advise please, Recommendations for gearbox oil appears to be Castrol’s Syntax. This I understand is full synthetic. Is it 75/90 grade in all the transmission elements. Ie g/box, drive shaft and differential. For the engine a basic 20/40 Halfords multi grade )not synthetic) Is the above correct. Reg...
by barryh
Sat Feb 13, 2021 5:43 pm
Forum: Airhead Q&A's
Topic: Replacement alternator
Replies: 16
Views: 936

Re: Replacement alternator

Reducing the overall electrical load seems a better plan that a high output alternator - and as Rob says standard parts will always be available. LED bulbs make a big difference and free up about 100W - headlamp / pilot lamp / tail lamp / speedo + tach bulbs can all be LED. My heated jacket uses 50...
by barryh
Sat Feb 06, 2021 11:25 am
Forum: Airhead Q&A's
Topic: R60/6 centre stand
Replies: 9
Views: 277

Re: R60/6 centre stand

Not sure how you were thinking of repairing that hole where it wore through the tube at the bottom. I welded on thin strips of stainless steel so that it wouldn't start to rust when first use took the paint off. It all blended in nicely with the angle grinder and you would have to look close to see ...
by barryh
Tue Feb 02, 2021 6:52 pm
Forum: Airhead Q&A's
Topic: Electronic ignition and Spark Plugs
Replies: 13
Views: 588

Re: Electronic ignition and Spark Plugs

Make your own using solid copper core HT lead and NGK LB05F plug caps.
by barryh
Mon Feb 01, 2021 11:24 am
Forum: Airhead Q&A's
Topic: Electronic ignition and Spark Plugs
Replies: 13
Views: 588

Re: Electronic ignition and Spark Plugs

if original a 79 engine would have what we call points in can. Take the front cover off the can and you should see the points unless the can has been replaced with an electronic ignition version. With the front cover off there is an outrigger bearing plate which also has to be removed if you want to...
by barryh
Sun Jan 31, 2021 2:29 pm
Forum: Airhead Q&A's
Topic: Mannol oils for airheads
Replies: 13
Views: 658

Re: Mannol oils for airheads

ACEA is a specification that is self certified so all they have to do is sufficient internal testing to claim it meets the ACEA criteria. I wouldn't touch an oil where the company couldn't be bothered with ACEA specs.
by barryh
Thu Jan 28, 2021 5:10 pm
Forum: Airhead Q&A's
Topic: All my photos attached appear rotated......why?
Replies: 12
Views: 554

Re: All my photos attached appear rotated......why?

I've only ever noticed pictures rotated when they were taken on a phone - which I know is pretty much all of them these days but I think the phone may be at the root of the problem.
by barryh
Wed Jan 27, 2021 3:04 pm
Forum: Airhead Q&A's
Topic: R60/6 drive train backlash
Replies: 7
Views: 451

Re: R60/6 drive train backlash

I have a record of measuring mine when it had done only 6000 miles and it was 3cm at the centre of the tyre tread in 1st gear so I expect it can't have been much better than that when new.
by barryh
Wed Jan 13, 2021 6:19 pm
Forum: Airhead Q&A's
Topic: Vacuum Gauge Adaptor
Replies: 7
Views: 314

Re: Vacuum Gauge Adaptor


The screw that came out is about 4mm

In case you ever have to replace one, the screw is M3.5 x 0.6
by barryh
Thu Jan 07, 2021 10:21 am
Forum: Airhead Q&A's
Topic: 1988 R80RT battery
Replies: 14
Views: 628

Re: 1988 R80RT battery

I’ll have to whisper this, I don’t want Barry to hear :wink: Financially-wise I didn’t want to spend as much as I did on Odyssey batteries. But as my bikes live outside and one of Odyssey’s key selling points was their operation at zero degrees, I was happy to go ahead. Then again, my current bikes...
by barryh
Wed Jan 06, 2021 11:40 am
Forum: Airhead Q&A's
Topic: 1988 R80RT battery
Replies: 14
Views: 628

Re: 1988 R80RT battery

The batteries produced under the Odyssey name are good but, to my mind, overpriced. There are many considerably cheaper brands around that are, in my opinion, just as good..... That's how I think of Odyssey batteries, way over priced and would have to last a minimum of 15 years to compete on an ove...
by barryh
Tue Dec 29, 2020 3:33 pm
Forum: Airhead Q&A's
Topic: SAE to metric conversion?
Replies: 87
Views: 2422

Re: SAE to metric conversion?

My first Sinclair product in 1970 was the stereo 60 amplifier bought as pre-amp, power amps and power supply modules which I built into a case. Turntable and speakers were built from kits too. It was a step up from an old Dansette style record player.
by barryh
Thu Dec 24, 2020 8:08 pm
Forum: Airhead Q&A's
Topic: SAE to metric conversion?
Replies: 87
Views: 2422

Re: SAE to metric conversion?

I’ll be honest, when quoting small measurements, 0.0002 of an inch, I just blink and reach for the metric equivalent. I'm the opposite. If I see a valve clearance in metric it means nothing to me. My brain goes: 1mm equals 40 thou so .1mm equals 4 thou etc until I've converted it something I can gr...
by barryh
Thu Dec 24, 2020 11:26 am
Forum: Airhead Q&A's
Topic: SAE to metric conversion?
Replies: 87
Views: 2422

Re: SAE to metric conversion?

I have a set of imperial open ended spanners given to me when i was an apprentice. It seemed a little sacrilegious to do it after 50 years but I've ground some of the bigger ones out to metric for use on plumbing fittings. At least now they get used.
by barryh
Wed Dec 09, 2020 3:51 pm
Forum: Airhead Q&A's
Topic: Brembo Caliper Rebuild Bolt Torque Settings?
Replies: 12
Views: 662

Re: Brembo Caliper Rebuild Bolt Torque Settings?

When I was trying to decide what torque to use on my Ate caliper halves I did a very rough calculation on what the clamping forces would be at a relatively low figure like 22 ftlbs and it came out at several tonnes. I forget the actual figure but I was more than satisfied it was enough.
by barryh
Fri Dec 04, 2020 10:26 am
Forum: Airhead Q&A's
Topic: Reassembling a Karcoma petcock
Replies: 6
Views: 354

Re: Reassembling a Karcoma petcock

I did something similar with a jig and a vice. No way could I do it by hand and it wasn't for the want of trying.
by barryh
Fri Nov 27, 2020 1:42 pm
Forum: Airhead Q&A's
Topic: Coil types
Replies: 38
Views: 1672

Re: Coil types

While the second part of the statement is true, the first isn't. 'Electrical Resistance' describes the resistance to a steady electrical flow imposed by the physical characteristics of the conducting material. Put simply, the resistance of a conductor is a function of it's length, its cross section...
by barryh
Thu Nov 26, 2020 8:58 pm
Forum: Airhead Q&A's
Topic: Coil types
Replies: 38
Views: 1672

Re: Coil types

I spoke to Boyer and they said that the Bosch is physically larger than British coils of the same era and the wires are of a heavier gauge resulting in a lower resistance reading and losses, the coils inductance would be higher offsetting the lower resistance, so all is good ,thanks to everyone .Ia...
by barryh
Fri Nov 20, 2020 1:52 pm
Forum: Airhead Q&A's
Topic: Rear main seals
Replies: 11
Views: 510

Re: Rear main seals

I'd replace the breather before the rear main seal. If it's the disc type breather it can be replaced with the reed type or as an option to try first, drill a 1.5mm hole in the disc. Nothing to lose by trying that and It worked for me, all but eliminating the turkey gobbling noise. I presume it work...
by barryh
Wed Nov 18, 2020 6:52 pm
Forum: Airhead Q&A's
Topic: Coil types
Replies: 38
Views: 1672

Re: Coil types

Primary resistance of the 313 coil is 0.7 ohms which is why I said earlier the Boyer had done well to survive. You have been running with 0.7 +1.2 = 1.9 ohms or thereabouts. The critical component in the Boyer will be the power transistor. It's normal in electronic circuit design to be very conserva...
by barryh
Wed Nov 18, 2020 11:01 am
Forum: Airhead Q&A's
Topic: Topdon findings and low charging
Replies: 20
Views: 1031

Re: Topdon findings and low charging

Just under 14 volts at 3000rpm is ok but hardly optimum especial with modern batteries. I would want at least 14.3 volts although the gel battery should be checked for recommended charging voltage. Traditional gel batteries are not tolerant of overcharging because they must not be allowed to gas but...
by barryh
Sat Nov 14, 2020 8:39 pm
Forum: Airhead Q&A's
Topic: Brembo Caliper Rebuild Bolt Torque Settings?
Replies: 12
Views: 662

Re: Brembo Caliper Rebuild Bolt Torque Settings?

George, Motorworks say the callipers should not be split or they may leak on reassembly. On the dual piston Ate caliper which is very similar to the Brembo, Ate don't even issue a torque setting because they don't want you to take them apart. Nor do they sell the O ring. Mine didn't leak either.

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