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VMX Sidecars / Re: 2015 Conondale Classic
« on: July 17, 2015, 03:30:46 pm »
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2
Tech Talk / Re: Is this Gunner Gasser good or Crap? VRM Racing Motorsport Evilbay
« on: September 02, 2014, 08:11:41 pm »
I bought a Venhill 600A off eBay, I reckon they'd be pretty hard to beat for quality. They are machined from a billet, not die cast or plastic.
I think it was approx £50 shipped so not cheap, but anyone who has ever had a bad experience with an el cheapo imitation may agree that it is cheap insurance.
http://www.venhill.co.uk/Controls_and_Levers/MOTORCYCLE_CONTROLS/TWISTGRIPS/600A_VENHILL_DUAL_RATE_TWIST_GRIP.html
I think it was approx £50 shipped so not cheap, but anyone who has ever had a bad experience with an el cheapo imitation may agree that it is cheap insurance.
http://www.venhill.co.uk/Controls_and_Levers/MOTORCYCLE_CONTROLS/TWISTGRIPS/600A_VENHILL_DUAL_RATE_TWIST_GRIP.html
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VMX Sidecars / Re: Dalby on again
« on: August 22, 2014, 07:39:40 pm »
Yes Stephen would make a great passenger, he's just a bit out of practice. The last time he swung of an outfit was in the early/mid 80's with Emil Bollhalder in W.A on a 998 EML Yam!
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VMX Sidecars / Murray Williams Sidecar Cup
« on: August 04, 2014, 08:10:04 pm »
PRESS RELEASE
Australian Sidecarcross Association,
2014 Murray Williams Sidecar Cup
The Australian Sidecarcross Association (ASA) is proud to announce the inaugural running in 2014 of the Murray Williams Sidecar Cup. This event will showcase Sidecar Motocross as seen in the yesteryears with the development of a premier Sidecar Motocross Race Day in South Australia.
The ASA President, Mr. Rocky Warren said, “The ASA have worked tirelessly in developing an event with a race format with generous rewards to that was experienced from the 1960’s through to the 1980’s. At the same time there was an overwhelming need to acknowledge the efforts of a true Legend of the sport, Murray Williams and his long time passenger Wayne Kearvell, who together won many MX sidecar titles Although both recently retired from Motocross Sidecars they are still passionate supporters of our sport.”
As a result, and as a tribute to Murray Williams, the ASA will be holding the inaugural “Murray Williams Sidecar Cup” in place of the ASA titles, on October 26th 2014. In addition, the Wayne Kearvell Trophy will be introduced to acknowledge the outstanding achievement of a sidecar passenger at this event, regardless of the class they are riding.
This year the event will be held at Murray Bridge, with over $3,000.00 in total prize money shared across all classes, with the exception of Junior Sidecars, who will be awarded trophies for the Junior Murray Williams Cup. Racing will consist of 3 rounds of racing for all the usual classes from Juniors, pre 1968 through to the Modern A & B Grade. The final event of the day will be the “Murray Williams Sidecar Cup”. It will consist of 3 races of 4 laps each, back to back, which will allow anyone to have a real shot at taking out the Murray Williams Cup and taking home the first prize of $500.00. Prize money will place back to 6th.
This is an event you will not want to miss with Supplementary Regulations and Entry Forms available from the Motorcycling South Australia and ASA Websites. This event is an ideal opportunity for the interstate riders to ride the MA Australian title at Horsham (Vic) or the SA Historic Championships at ACUSA Park (SA) the weekend prior, and then venture over the following weekend and earn some valuable prize money.
A feature of this event will be a spirited demonstration of many of the past retired Sidecar racers and their passengers, on both historic and modern sidecars. The ASA already have a strong commitment from the “Legends of Past years” who we all followed as young kids in the 60’s 70’s, 80’ & 90’s.
Racing will include:
Pee Wee Sidecar Demonstrations,
Legends of Yesteryear Demonstrations
Junior Sidecars
Pre 1968, 1975, 1985 & 1990 Historic sidecar classes
Road Trial and Modern Sidecars
October 26 th, 2014, Murray Bridge MX Track, Old Princes Highway, Monarto, SA.
Australian Sidecarcross Association,
2014 Murray Williams Sidecar Cup
The Australian Sidecarcross Association (ASA) is proud to announce the inaugural running in 2014 of the Murray Williams Sidecar Cup. This event will showcase Sidecar Motocross as seen in the yesteryears with the development of a premier Sidecar Motocross Race Day in South Australia.
The ASA President, Mr. Rocky Warren said, “The ASA have worked tirelessly in developing an event with a race format with generous rewards to that was experienced from the 1960’s through to the 1980’s. At the same time there was an overwhelming need to acknowledge the efforts of a true Legend of the sport, Murray Williams and his long time passenger Wayne Kearvell, who together won many MX sidecar titles Although both recently retired from Motocross Sidecars they are still passionate supporters of our sport.”
As a result, and as a tribute to Murray Williams, the ASA will be holding the inaugural “Murray Williams Sidecar Cup” in place of the ASA titles, on October 26th 2014. In addition, the Wayne Kearvell Trophy will be introduced to acknowledge the outstanding achievement of a sidecar passenger at this event, regardless of the class they are riding.
This year the event will be held at Murray Bridge, with over $3,000.00 in total prize money shared across all classes, with the exception of Junior Sidecars, who will be awarded trophies for the Junior Murray Williams Cup. Racing will consist of 3 rounds of racing for all the usual classes from Juniors, pre 1968 through to the Modern A & B Grade. The final event of the day will be the “Murray Williams Sidecar Cup”. It will consist of 3 races of 4 laps each, back to back, which will allow anyone to have a real shot at taking out the Murray Williams Cup and taking home the first prize of $500.00. Prize money will place back to 6th.
This is an event you will not want to miss with Supplementary Regulations and Entry Forms available from the Motorcycling South Australia and ASA Websites. This event is an ideal opportunity for the interstate riders to ride the MA Australian title at Horsham (Vic) or the SA Historic Championships at ACUSA Park (SA) the weekend prior, and then venture over the following weekend and earn some valuable prize money.
A feature of this event will be a spirited demonstration of many of the past retired Sidecar racers and their passengers, on both historic and modern sidecars. The ASA already have a strong commitment from the “Legends of Past years” who we all followed as young kids in the 60’s 70’s, 80’ & 90’s.
Racing will include:
Pee Wee Sidecar Demonstrations,
Legends of Yesteryear Demonstrations
Junior Sidecars
Pre 1968, 1975, 1985 & 1990 Historic sidecar classes
Road Trial and Modern Sidecars
October 26 th, 2014, Murray Bridge MX Track, Old Princes Highway, Monarto, SA.
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VMX Sidecars / Re: pre78 sidecars..Port Augusta Australian Championships.
« on: July 18, 2014, 04:51:37 pm »
There is a number Of reasons for and against the pre '75 cutoff date. If we move it from pre '75 to pre '78 then we include rear disc brakes (slight) increase in suspension travel and 'lean forward' rear shocks.
The reason the RT15's are allowed is because they are easily changed to Pre'75 specs and once that is done, they look the part and most are already fitted with pre '75 eligible engines.
On the other hand I agree that an RT15 is light years behind the likes of an '84 EML.
Whenever you include cutoff dates, no matter where the goalposts are set, usually the latest allowable model within that class is the best, especially with sidecars where there is 10 years between '75 and '85.
If we change it to pre '78, then the guy that owns a 1969 model looses out.
The reason the RT15's are allowed is because they are easily changed to Pre'75 specs and once that is done, they look the part and most are already fitted with pre '75 eligible engines.
On the other hand I agree that an RT15 is light years behind the likes of an '84 EML.
Whenever you include cutoff dates, no matter where the goalposts are set, usually the latest allowable model within that class is the best, especially with sidecars where there is 10 years between '75 and '85.
If we change it to pre '78, then the guy that owns a 1969 model looses out.
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VMX Sidecars / Re: Sidecar MX pics - Post them up here
« on: January 19, 2014, 02:03:04 pm »
.....license to thrill...
haha
haha
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VMX Sidecars / Re: Sidecar MX pics - Post them up here
« on: January 19, 2014, 01:46:36 pm »
AND in the RED corner--
Popeye!!
Popeye!!
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VMX Sidecars / Re: Sidecar MX pics - Post them up here
« on: January 19, 2014, 10:26:40 am »
Here is some pics for Lama:
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VMX Sidecars / Re: Sidecar MX pics - Post them up here
« on: January 17, 2014, 09:11:53 pm »Hi guys, I have an almost finished project if some can post the pics would be good?send em through ill post them for you?
[email protected]
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VMX Sidecars / Re: Sidecar MX pics - Post them up here
« on: January 11, 2014, 07:35:57 pm »270 when you mastered the batteryles ignition setup , I would be interested in a 998 cc 270 project . I reckon in period 4 road racing that setup would be a contender. Is the 270 configuration also easier to start then a conventional ?
Yes it should make a great road race motor, still no easier to start though!
Working on battery-less at the moment
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VMX Sidecars / Re: Sidecar MX pics - Post them up here
« on: January 11, 2014, 07:33:18 pm »Quote
As s side note somewhere amongst my well ordered parts I have a re-phased crank and camshaft set for a CB754 used with other electrical mods to create a four cylinder twin.. Meaning 1and 4 fire together then 2 and 3. No I have never put it together but will one day I should.
Hi Tim, the honda 4 motor sounds interesting,
The 4's are simple, just cut the cam in the middle and rotate half of it by 180° and install.
Don't even need to change the ignition as they already fire a waste spark with dual tower coils.
I had a Suzuki GS 750 like that in my '84 EML before I removed it and put it back to how it should be with a big twin.
Many manufacturers make 270° twins now, even the new triumphs and norton's have strayed from their heritage
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VMX Sidecars / Re: Sidecar MX pics - Post them up here
« on: January 11, 2014, 12:43:36 pm »
Also as EML says, the 277° is an easier and more common mod than the 270°.
The Yamaha crank is basically 2x complete 2stroke cranks joined together in the middle with a 13 spline. If you turn it by 3 splines you can achieve 83.07°/276.92° Crank offset. Close enough to the 90°/270°
The Yamaha crank is basically 2x complete 2stroke cranks joined together in the middle with a 13 spline. If you turn it by 3 splines you can achieve 83.07°/276.92° Crank offset. Close enough to the 90°/270°
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VMX Sidecars / Re: Sidecar MX pics - Post them up here
« on: January 11, 2014, 12:36:52 pm »
Yes as EML explains, the stock Yamaha is like triumph BSA Norton and any of the early parallel twins with both crankpins in line, both pistons rise and fall at the same time, but on opposite cycles. This results in an even 'firing order' with one cylinder firing every 360°.
The 270° rephase simply means that (in most cases) the right hand side of the crank has been advanced by 90° in front of the left. So instead of the original 360°/360°, it is now 270°/450°. The uneven firing gives the back tyre more time to recover resulting in better traction even though it sounds like 'smooth' power.
Road racers have been using this theory for a while, Yamaha's latest 'cross plain' crank design in the 4cyl R1 is just 1 example. Power is more manageable and it hangs on better in the wet.
The crank has a much better primary balance which kills the infamous XS650 vibration, so energy that used to be spent making vibration is now being sent to the back wheel. Free power!
Instead of accelerating 2 pistons/rods at full velocity and then having to stop then and turn them back the other way at the same time, there is always one piston near full velocity when the other is changing direction- top and bottom.
So we now have a parallel twin that sounds and behaves like a 90° V twin.
The 270° rephase simply means that (in most cases) the right hand side of the crank has been advanced by 90° in front of the left. So instead of the original 360°/360°, it is now 270°/450°. The uneven firing gives the back tyre more time to recover resulting in better traction even though it sounds like 'smooth' power.
Road racers have been using this theory for a while, Yamaha's latest 'cross plain' crank design in the 4cyl R1 is just 1 example. Power is more manageable and it hangs on better in the wet.
The crank has a much better primary balance which kills the infamous XS650 vibration, so energy that used to be spent making vibration is now being sent to the back wheel. Free power!
Instead of accelerating 2 pistons/rods at full velocity and then having to stop then and turn them back the other way at the same time, there is always one piston near full velocity when the other is changing direction- top and bottom.
So we now have a parallel twin that sounds and behaves like a 90° V twin.
it sounds like a dodgy old 500 thumperWhere did you get that from EML?? it must only sound like that when you're behind it!
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VMX Sidecars / Re: Sidecar MX pics - Post them up here
« on: January 10, 2014, 07:38:50 pm »whats the 270 degree bit. is the crank different to a standard XS?Hi Hoony, yes the crank is slightyly different to standard 360 degree XS
That looks great Matt, is that going in the 84?
Spot on Popeye, the EML only ever had the 850 borrowed from the Wasp, now I will have 2 bikes going
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VMX Sidecars / Re: Sidecar MX pics - Post them up here
« on: January 10, 2014, 07:13:07 pm »
My first 2 attempts at pattern making and casting