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Search: Posts Made By: pommie john
Forum: Airheads 07-18-2014, 10:06 AM
Replies: 20
Views: 1,057
Posted By pommie john
Well, once you have two or more gauges agreeing...

Well, once you have two or more gauges agreeing on the pressure, you've got something to go on :)
Forum: Airheads 07-18-2014, 07:35 AM
Replies: 20
Views: 1,057
Posted By pommie john
I have three gauges , one pencil, one digital and...

I have three gauges , one pencil, one digital and one dial. The pencil and digital read exactly the same and the dial one is around 10psi high! It's a common problem with cheap gauges.

I'd do...
Forum: Old's Cool 06-19-2014, 02:04 AM
Replies: 15,060
Views: 8,448,409
Posted By pommie john
Two discs, one calliper. Odd brake set up.

Two discs, one calliper. Odd brake set up.
Forum: Airheads 06-17-2014, 02:28 AM
Replies: 14
Views: 818
Posted By pommie john
4.5" is only 114mm so it should fit in. Most...

4.5" is only 114mm so it should fit in. Most tyres are reasonably close to their stated width, assuming you put them on the recommended rim.
Forum: Old's Cool 06-12-2014, 08:51 PM
Replies: 6
Views: 477
Posted By pommie john
Now the fun begins :) Put it all back...

Now the fun begins :)

Put it all back one bit at a time and see when it stops working.
Forum: Old's Cool 06-12-2014, 02:51 PM
Replies: 6
Views: 477
Posted By pommie john
I'm not an expert on XL250 electrical systems,...

I'm not an expert on XL250 electrical systems, mine came with no battery, no lights and virtually no wiring, but if it helps, I tested the ignition system by connecting a 6v battery directly to the...
Forum: Old's Cool 06-12-2014, 03:05 AM
Replies: 15,060
Views: 8,448,409
Posted By pommie john
Uh oh, I'm conflicted about this one. It looks a...

Uh oh, I'm conflicted about this one. It looks a bit hipster, but it's a real Triumph :)
Forum: Old's Cool 06-11-2014, 10:56 PM
Replies: 6
Views: 477
Posted By pommie john
Is there a battery on there? If there's a...

Is there a battery on there?

If there's a good battery I would imagine you'd get a spark whether on not the stator is working.
Forum: Airheads 06-03-2014, 04:06 PM
Replies: 24
Views: 1,004
Posted By pommie john
I put a Boyer on my race bike when I built it in...

I put a Boyer on my race bike when I built it in the mid 90s. It's still there and it still works.

The only time it failed was when it got a poor earth through the bean can screws that had...
Forum: Airheads 06-01-2014, 09:35 PM
Replies: 11
Views: 962
Posted By pommie john
I have heard a few tales of the counterweights...

I have heard a few tales of the counterweights coming off after a reground crank has been re assembled. It happened to a friend of mine at turn three, Phillip Island. That's flat in top.
I would...
Forum: Airheads 05-23-2014, 02:47 AM
Replies: 19
Views: 840
Posted By pommie john
just remember that cutting a spring shorter...

just remember that cutting a spring shorter increases its effective spring rate.

If the forks are anything like Marzocchi that ball bearing acts as a one way valve. As the forks compress the...
Forum: Airheads 05-21-2014, 02:52 AM
Replies: 507
Views: 26,391
Posted By pommie john
I think your assessment is correct. The clutches...

I think your assessment is correct. The clutches I've seen had white marks ( presumably) from the factory. They are supposed to be at 120 degrees from each other.

I'd run as you have it.
Forum: Airheads 05-17-2014, 03:23 PM
Replies: 158
Views: 13,537
Posted By pommie john
For what it's worth I run BP ultimate ( 98 RON )...

For what it's worth I run BP ultimate ( 98 RON ) in my race bike. It's only 10.5 :1 but there's never been a problem with pinging. Many people have told me I shouldn't use high octane unleaded...
Forum: Airheads 05-12-2014, 12:22 AM
Replies: 16
Views: 956
Posted By pommie john
Another vote against the brace :) Thanks for...

Another vote against the brace :) Thanks for the input.

I just went down and did a little test for stiction.

Put a cable tie round the fork tube, push down hard on the bars and let the bike...
Forum: Airheads 05-11-2014, 07:54 PM
Replies: 16
Views: 956
Posted By pommie john
The bush conversion is about halfway down this...

The bush conversion is about halfway down this page by a poster called Eldert

http://www.ducati.ms/forums/14-vintage/142976-cartridge-upgrade-38mm-ceriani-marzocchi.html



I know what you...
Forum: Airheads 05-11-2014, 07:24 PM
Replies: 16
Views: 956
Posted By pommie john
Good info thanks. I obviously need to get...

Good info thanks.

I obviously need to get to a track and spend a whole day doing nothing but working on the handling.

I have seen on the internet that one guy honed out the entire bore of the...
Forum: Airheads 05-11-2014, 07:09 PM
Replies: 16
Views: 956
Posted By pommie john
Now you mention it, I had a big tankslapper in...

Now you mention it, I had a big tankslapper in qualifying. It's possible that the forks have twisted and the brace has not un twisted. It's a Telefix one. It is adjustable... it clamps around the...
Forum: Airheads 05-11-2014, 06:35 PM
Replies: 16
Views: 956
Posted By pommie john
I have a 2.5x18 front rim with a 110/80 Avon AM...

I have a 2.5x18 front rim with a 110/80 Avon AM 22.

The thing is, I think a lot of it is the circuit. It is the bumpiest track I've ever ridden. I never used to worry about the handling, I've...
Forum: Airheads 05-11-2014, 05:04 PM
Replies: 16
Views: 956
Posted By pommie john
Yeah the compression damper holes are drilled out...

Yeah the compression damper holes are drilled out and it has .85 kg/mm racetech springs. Sag is about 25mm.

A couple of people have said the problem with them is that instead of running a bush...
Forum: Airheads 05-11-2014, 04:35 PM
Replies: 16
Views: 956
Posted By pommie john
Any handling gurus out there?

I went for a race on my airhead last weekend and had more trouble with the front end.

It's got 38mm Marzocchis with cartridge emulators in them.
The chatter ( or patter as it's known where...
Forum: Airheads 05-07-2014, 05:02 PM
Replies: 162
Views: 11,831
Posted By pommie john
It's a decades old design, of course it can be...

It's a decades old design, of course it can be improved. Independent tuners are getting far more horsepower out of airheads than the factory ever did party because of improvements in knowledge of...
Forum: Airheads 05-01-2014, 01:06 AM
Replies: 21
Views: 902
Posted By pommie john
I'm pretty sure the camplate and detente was...

I'm pretty sure the camplate and detente was modified at some point.
Forum: Airheads 04-30-2014, 08:52 PM
Replies: 22
Views: 967
Posted By pommie john
That sounds like a good plan. There are two...

That sounds like a good plan.

There are two types of spring available from BMW. Standard and heavy duty. I use a heavy duty one in my race bike, and if this is the bike you're doing a bit of...
Forum: Airheads 04-30-2014, 05:27 PM
Replies: 22
Views: 967
Posted By pommie john
There's no need to replace them as a matter of...

There's no need to replace them as a matter of course. If they don't appear scored and they are flat ( put a straight edge across them) they should be fine.
Forum: Airheads 04-30-2014, 12:39 AM
Replies: 37
Views: 1,615
Posted By pommie john
It's really hard to diagnose problem like this...

It's really hard to diagnose problem like this even when the bike's right in front of you, let alone over the internet!

All I can suggest is do the cheap and easy things first.

Cable...
Forum: Airheads 04-29-2014, 12:56 AM
Replies: 37
Views: 1,615
Posted By pommie john
The first thing we need to do is standardise our...

The first thing we need to do is standardise our descriptive language.

Clutch slip is when the clutch cannot transmit all the power to the transmission ( and thence to the rear wheel). When a...
Forum: Airheads 04-26-2014, 07:12 PM
Replies: 46
Views: 2,464
Posted By pommie john
Do the remaining bolts ( the top ones) have a...

Do the remaining bolts ( the top ones) have a grade marked on the heads? Sometimes it's numbers sometimes radial lines.
Forum: Airheads 04-25-2014, 08:16 PM
Replies: 12
Views: 546
Posted By pommie john
I have never used them myself, but I understand...

I have never used them myself, but I understand they are a high quality coil not unlike Dyna coils.

I'd have no hesitation using them on my bike.

I'm not too familiar with original BMW...
Forum: Airheads 04-25-2014, 03:58 PM
Replies: 12
Views: 546
Posted By pommie john
If it's the same impedence ( ohms) as the...

If it's the same impedence ( ohms) as the original coil it will be fine.
Forum: Airheads 04-24-2014, 05:07 PM
Replies: 12
Views: 634
Posted By pommie john
I'll put my hand up to making an expensive...

I'll put my hand up to making an expensive mistake with a drum brake recently that maybe you can learn from...

The front brake on my little Honda race bike was juddering, and being used to disc...
Forum: Airheads 04-23-2014, 11:43 PM
Replies: 46
Views: 2,464
Posted By pommie john
I remember talking to my local BMW specialist and...

I remember talking to my local BMW specialist and he told me that those bolts are 12.9 grade not an 8.8

If that's true you may have had the wrong strength bolts in there.
Forum: Airheads 04-21-2014, 03:07 PM
Replies: 11
Views: 464
Posted By pommie john
I use one of these on my little Honda, they're...

I use one of these on my little Honda, they're available in various ratios, I'm
not sure about a 2:1 version though.
...
Forum: Airheads 04-17-2014, 03:06 PM
Replies: 58
Views: 3,880
Posted By pommie john
Cams usually wear on the top of the lobes, not...

Cams usually wear on the top of the lobes, not much on the heel where it would affect valve clearance. A failing follower might be more likely? Maybe?


The confusing part is that if the...
Forum: Airheads 03-29-2014, 03:05 AM
Replies: 23
Views: 1,294
Posted By pommie john
Ah, OK, I'll assume it's the right coil then :)

Ah, OK, I'll assume it's the right coil then :)
Forum: Airheads 03-29-2014, 02:16 AM
Replies: 23
Views: 1,294
Posted By pommie john
The 88 RS has points right? I would have...

The 88 RS has points right?

I would have thought that a 1.5 ohm coil is too low impedance. I would have expected to use a green 3 ohm.

Another call to dyna might be in order.
Forum: Airheads 03-27-2014, 11:08 PM
Replies: 23
Views: 1,294
Posted By pommie john
Have you got one dyna dual output coil running...

Have you got one dyna dual output coil running both plugs or two separate single output coils?

Or do you have a dual plug heads with two dual output coils?


If it's one dual output coil ...
Forum: Old's Cool 03-18-2014, 03:45 AM
Replies: 3
Views: 509
Posted By pommie john
Actually, if you look at the engine of a Honda...

Actually, if you look at the engine of a Honda 500 four and a Benelli 750/6 they seem to be the same with a different number of cylinders. I remember being told that the Benelli is just a Honda four...
Forum: Airheads 03-11-2014, 01:57 AM
Replies: 507
Views: 26,391
Posted By pommie john
I understood that the stock ports are pretty ...

I understood that the stock ports are pretty average. A well known tuner once told me that porting was where he got a large amount of the power.
Forum: Airheads 03-05-2014, 02:51 PM
Replies: 507
Views: 26,391
Posted By pommie john
The only comment that I would make is that I...

The only comment that I would make is that I think a carb upgrade would complement the engine upgrades. I doubt if the current 32mm Bings would keep up with the motor. They would effectively...
Forum: Old's Cool 02-27-2014, 03:26 PM
Replies: 8
Views: 593
Posted By pommie john
I use the 15 - 45 sprockets on my road race XL...

I use the 15 - 45 sprockets on my road race XL 250. The 45 tooth is quite easily available, I bought mine from the local bike shop. It may be a bit over geared for a standard engine, ( mine is...
Showing results 1 to 40 of 500

 
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