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Search: Posts Made By: pommie john
Forum: Airheads Yesterday, 04:11 AM
Replies: 260
Views: 28,270
Posted By pommie john
I don't see how this could work. If you just...

I don't see how this could work. If you just have a ball and cup joining the two pushrod halves, they could just flex sideways until the hit the inside of the pushrod tube.

The way I have heard...
Forum: Airheads Yesterday, 04:05 AM
Replies: 7
Views: 315
Posted By pommie john
i probably just over filled it. I never...

i probably just over filled it.

I never have anything blow out of the breather. That's probably because I have the 25mm sump extension, 25mm longer oil pick up and the oil level 25mm lower.
Forum: Airheads 01-25-2015, 07:41 PM
Replies: 7
Views: 315
Posted By pommie john
No groove. It was a fast track, revving to 8500,...

No groove. It was a fast track, revving to 8500, but that's not unusual. The rings aren't too old. Maybe a leakdown test is a good idea. It's possible that its crankcase pressure.

Edit: I've...
Forum: Airheads 01-25-2015, 07:10 PM
Replies: 7
Views: 315
Posted By pommie john
Definitely the seal. I've cleaned the whole area...

Definitely the seal. I've cleaned the whole area now so I can't photograph it but there's no doubt it was the seal. I installed it dry on a good guide ring.

It seems odd that there's so much...
Forum: Airheads 01-25-2015, 06:53 PM
Replies: 7
Views: 315
Posted By pommie john
Wink Rear Main seal , new Motobins seal or BMW teflon?

Hi Team

After the last race I had a small oil leak from the clutch gearbox area so I pulled the gearbox off and there's a slight leak from the rear main seal. There's also maybe some oil coming...
Forum: Airheads 01-23-2015, 12:23 AM
Replies: 3
Views: 274
Posted By pommie john
For what it's worth I have my shocks mounted with...

For what it's worth I have my shocks mounted with standard M10 x 1.5 bolts. They have a nut on them so it's not like you have to have the fine thread to match a thread on the bike.
Forum: Airheads 01-22-2015, 05:50 PM
Replies: 30
Views: 1,160
Posted By pommie john
They don't actually rotate the other way, but...

They don't actually rotate the other way, but when you blip the throttle, the bike rocks to the left instead of the right due to the Coriolis effect.
Forum: Old's Cool 01-22-2015, 04:07 PM
Replies: 13
Views: 508
Posted By pommie john
The Aussie dollar is dropping like a stone...

The Aussie dollar is dropping like a stone against the greenback. You might be OK :D
Forum: Old's Cool 01-21-2015, 10:37 PM
Replies: 13
Views: 508
Posted By pommie john
Eh? here's a list of the sizes from that...

Eh?

here's a list of the sizes from that link.


100/90-19 57H TT100GP TL
110/90-18 61H TT100GP TL
130/80-18 66H WT TT100GP
3.00-18 47S TT100GP TL
3.50-18 56H TT100GP TL
Forum: Airheads 01-21-2015, 10:34 PM
Replies: 9
Views: 522
Posted By pommie john
CC used to sell them. I don't know if they had...

CC used to sell them. I don't know if they had any real advantage. From memory ( which isn't always great) the CC roller rockers used to have a higher ratio so you got more valve lift.
Forum: Old's Cool 01-21-2015, 03:52 PM
Replies: 13
Views: 508
Posted By pommie john
Dunlop's TT100GP which has the same tread pattern...

Dunlop's TT100GP which has the same tread pattern as the K81 is available in more sizes than the K81 .
You can get a 3.00-18 and a 3.50-18 and several metric sizes too.

It's got a softer...
Forum: Airheads 01-21-2015, 03:06 AM
Replies: 5
Views: 505
Posted By pommie john
if you pull hard enough they'll both be fully...

if you pull hard enough they'll both be fully open .... perfect synch :)
Forum: Airheads 01-19-2015, 08:27 PM
Replies: 260
Views: 28,270
Posted By pommie john
Have you obtained the spousal approval to ride it...

Have you obtained the spousal approval to ride it yet Adrian? :D
Forum: Airheads 01-14-2015, 05:52 AM
Replies: 21
Views: 653
Posted By pommie john
Mine are 40mm with no air filters and a pretty...

Mine are 40mm with no air filters and a pretty hot motor. I doubt if my jetting would be much help. Sorry.
Forum: Airheads 01-14-2015, 05:30 AM
Replies: 21
Views: 653
Posted By pommie john
Here's mine, also by Jim Cray. It's a clamp -on...

Here's mine, also by Jim Cray. It's a clamp -on carb converted to rubber mount.
I imagine that Chas's is the same.


http://i5.photobucket.com/albums/y178/pommiejohn/vs1.jpg...
Forum: Airheads 01-14-2015, 05:22 AM
Replies: 28
Views: 1,585
Posted By pommie john
You know the guy who built it originally, many...

You know the guy who built it originally, many years ago. It's what you'd expect from Jim :)
Forum: Airheads 01-14-2015, 12:55 AM
Replies: 28
Views: 1,585
Posted By pommie john
Here in Queensland, Australia I decided to put my...

Here in Queensland, Australia I decided to put my classic race bike on the road because I didn't race it much.

Because it's made before 1975 they really didn't care too much about modifications. ...
Forum: Airheads 01-09-2015, 07:08 PM
Replies: 193
Views: 20,705
Posted By pommie john
The angle of the swinging arm is determined by...

The angle of the swinging arm is determined by the rear shocks, not the angle of the engine.
It could be the the engine is raised ( rotated if you like) to make the transmission line up better...
Forum: Airheads 12-12-2014, 03:27 PM
Replies: 40
Views: 2,198
Posted By pommie john
As others have mentioned, drain the oil and...

As others have mentioned, drain the oil and refill with fresh oil. Take out the plugs and crank it over to pump any gas out of the combustion chambers, but I would also change the oil filter too.
Forum: Airheads 12-12-2014, 03:59 AM
Replies: 1,509
Views: 98,094
Posted By pommie john
Henry's run the engine. Surely if the pistons...

Henry's run the engine. Surely if the pistons were in the wrong way around he'd know by now.
Forum: Airheads 12-07-2014, 04:05 AM
Replies: 1,509
Views: 98,094
Posted By pommie john
OK, I'll qualify my comment . The dip in...

OK, I'll qualify my comment .

The dip in torque people see with a 336 cam is due to the 2:1 exhaust not being appropriate for the cam. Exhausts need to be designed taking into account many...
Forum: Vendors 12-06-2014, 03:54 AM
Replies: 71
Views: 6,251
Posted By pommie john
Excellent info , thanks. I once saw an airhead...

Excellent info , thanks.
I once saw an airhead on a dyno that made 105 bhp at the crank and the same engine made 90 RWHP on a dynojet.
Different dynos of course but it seems to make sense.
...
Forum: Old's Cool 12-04-2014, 11:54 PM
Replies: 119
Views: 40,716
Posted By pommie john
I rode one of Yamaha's test fleet back in the day...

I rode one of Yamaha's test fleet back in the day and IMHO the bad press about the handling was overblown. It just needed a better rear shock. The reports I read complained about frames flexing ...
Forum: Airheads 12-04-2014, 10:22 PM
Replies: 6
Views: 448
Posted By pommie john
I set my canister to the correct depth then...

I set my canister to the correct depth then silver soldered a small tab onto it so it can't move any more.
Forum: Airheads 12-04-2014, 02:16 PM
Replies: 1,509
Views: 98,094
Posted By pommie john
Hey, maybe we can turn this thread into an...

Hey, maybe we can turn this thread into an argument about audio cables :evil
Forum: Airheads 12-04-2014, 05:36 AM
Replies: 1,509
Views: 98,094
Posted By pommie john
Am I reading that right? You're running 15:1 AFR...

Am I reading that right? You're running 15:1 AFR at full throttle ?
Forum: Airheads 12-03-2014, 04:52 PM
Replies: 1,509
Views: 98,094
Posted By pommie john
Are turbo AFRs relevant to naturally aspirated...

Are turbo AFRs relevant to naturally aspirated engines? Don't turbos run rich to keep things cool?

I'm assuming your project is the turbo referred to in your handle
Forum: Airheads 12-03-2014, 03:17 PM
Replies: 1,509
Views: 98,094
Posted By pommie john
I fitted an air fuel gauge to my race bike but...

I fitted an air fuel gauge to my race bike but I never seem to have time to look at it!

What A/F ratios do you aim for?
Forum: Airheads 12-01-2014, 03:52 PM
Replies: 1,509
Views: 98,094
Posted By pommie john
I still maintain that the dip in the torque curve...

I still maintain that the dip in the torque curve is due to exhaust.

The reason I say this is because of this dyno run:

The bike spec is: 750cc with Venolia pistons ( from Chris at SJ )
Twin...
Forum: Airheads 11-30-2014, 05:17 PM
Replies: 1,509
Views: 98,094
Posted By pommie john
If you take it to the dyno I'd be really...

If you take it to the dyno I'd be really interested to see the difference between single and twin plugs.

Moorspeed says that you don't need to twin plug with his pistons, but it would be...
Forum: Airheads 11-30-2014, 03:18 PM
Replies: 1,509
Views: 98,094
Posted By pommie john
I'd be more inclined to think that the dip in...

I'd be more inclined to think that the dip in torque is down to the exhaust. I had that dip with a 2:1 exhaust but it went away when I fitted a 2:2 with Supertrapps
Forum: Airheads 11-29-2014, 12:00 AM
Replies: 1,509
Views: 98,094
Posted By pommie john
My 750 Monster was undersprung and overdamped on...

My 750 Monster was undersprung and overdamped on the compression damping. I cranked the spring pre load to max and reduced the compression damping a fair bit. It wasn't too bad after that. I...
Forum: Airheads 11-26-2014, 05:46 AM
Replies: 32
Views: 1,941
Posted By pommie john
Take the plugs out and the rocker covers off. ...

Take the plugs out and the rocker covers off.

Now turn the engine either with the rear wheel or with an allen key in the alternator nut and turn the engine through two full revolutions while...
Forum: Airheads 11-22-2014, 05:15 PM
Replies: 28
Views: 2,045
Posted By pommie john
This is turning into a helmet thread, sorry:D ...

This is turning into a helmet thread, sorry:D

If it has obvious signs of damage, scrapes, dents etc , bin it. Bin it now!

Helmets have a sticker inside that gives the build date. Depending on...
Forum: Airheads 11-11-2014, 03:51 PM
Replies: 17
Views: 766
Posted By pommie john
When you remove the flywheel, the crank is free...

When you remove the flywheel, the crank is free to float back and forward. If it moves forward, the thrust bearings can fall off their pegs and when you re bolt the flywheel up, you can cause a lot...
Forum: Airheads 11-09-2014, 04:47 AM
Replies: 260
Views: 28,270
Posted By pommie john
Looking good adrenal. You reckon it'll be ready...

Looking good adrenal. You reckon it'll be ready for 2015?
Forum: Airheads 11-04-2014, 12:07 AM
Replies: 83
Views: 4,350
Posted By pommie john
My friends have been right all along... it's an...

My friends have been right all along... it's an old man's bike .
Forum: Airheads 11-02-2014, 03:24 AM
Replies: 13
Views: 628
Posted By pommie john
They're just spacers to give more pre load on the...

They're just spacers to give more pre load on the springs.

I'd expect the same number on each side though. If you leave the caps off are the springs extending the same distance out of the top...
Forum: Airheads 10-29-2014, 06:40 PM
Replies: 34
Views: 2,063
Posted By pommie john
It's hard to tell from the video. The nuts...

It's hard to tell from the video.

The nuts have a slight flange on one side, almost like a captive washer. That side should be down, as in next to the rocker block.
Forum: Airheads 10-29-2014, 06:07 PM
Replies: 64
Views: 4,489
Posted By pommie john
I often wonder what I should do to make my race...

I often wonder what I should do to make my race bike a little quicker, but the honest answer ( and one that applies to most amateur racers like us) is that I should use the throttle more and the...
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