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Hi there guys. I'm considering putting together a racing XS1100 and I'd like your input to the design. The bike when built will be campaigned in the Classic Superbike Championship in South Africa. The base bike that will be used is a 1981 Yamaha XS 1100 SH Special.
It will be piloted by multiple South African Superbike Champion and Springbok racer, Gavin Ramsay.
The general specification for the bike has already been drafted for preliminary costing / resource acquisition purposes, but I would like to invite all the members on this thread to participate in the establishment of the complete specification - with me - to be followed during the build. This thread will be posted in both the UK and USA forums at the same time, with a request to the Australian forum members that want to participate, to use either the UK or USA forums. Ultimately, with meaningful participation, and at the conclusion of these threads, there should exist a complete ‘how-to’ in building a world class Yamaha XS 1100 racer. To conclude, if / when built, the bike will proudly wear the ‘colours’ of the UK, USA and Australian forums.
The start point will be the Rules for the class - included below - that will form the baseline for the discussions. Please take a minute to read through the Rules, to familiarize yourself with the rules, before posting your input.
[hr]
CLASSIC SUPERBIKES REGIONAL CHAMPIONSHIP RULES
The purpose of these rules are to match the performance of motorcycles from different periods by specifying various levels of engine capacity, modifications, suspension and ability on the race track. This should result in a variety of different models competing on equal terms resulting in the declaration of a single Classic Superbike Champion.
1) General Rules
NOTE: What is not specifically permitted is disallowed.
i. Exhaust systems can be modified or replaced and must be fitted with a silencer.
ii. Air cleaners and air boxes can be removed or replaced with aftermarket units.
iii. Oil catch tanks must be fitted if the air box is removed. (refer to SSR 70)
iv. Steel braided brake hoses may be fitted.
v. Any type or make of brake pads may be fitted.
vi. Tyres must be standard road going tyres as imported by a recognised importer and be readily available to the public. Slicks are not permitted.
vii. Chains and sprockets are unrestricted.
viii. Headlights, taillights, indicators and surplus wiring may be removed.
ix. Steering dampers may be fitted.
x. Spark plugs are open.
xi. Lock wiring of sump plugs and front and rear brake caliper mounting bolts is required.
xii. Oil filter housings or spin on filters must be lock wired or clamped.
xiii. Oil coolers are permitted.
xiv. Side and centre stands must be removed.
xviii. Tyre warmers are not permitted.
2) Rider And Motorcycle Details
iii. It is the rider’s responsibility to notify the Technical Committee of any modifications made to his/her motorcycle (or spare motorcycles), which involve structural changes to the frame, swing arm, wheels, front fork yokes, and custom brackets used to mount brake calipers, and to ensure that these are recorded in the scrutineering book.
3) Eligibility Of Motorcycles
i. A member of the Technical Committee must inspect motorcycles before it can compete in Classic Superbike racing.
4) Categories For Classic Superbikes
i. Standard Production Motorcycles (1982 – 1985)
ii. Modified Production Motorcycles (up to and including 1981)
iii. Modified Production Motorcycles Classic 400 (1985 – 1999) 400cc four strokes and 250cc two strokes.
6) Modified Production Motorcycles (Class B)
i. Engine
a) Maximum capacity allowed is 1170 cc (*Proposed amendment for 2011 - Maximum capacity allowed is 1200 cc – not ratified at this point).
b) Any engine modifications are allowed.
c) Carburetors for 4 valves per cylinder engines must be 34 mm CV carburetors, for 2 valves per cylinder engines, the carburetors can be changed to round slide or smooth bore types of any size. Flat slide or Electron carburetors are not allowed. The carburetors may be modified.
d) The engine must look the same as the original from the outside.
e) Crash brackets and aftermarket covers can be used.
ii. Frame And Body Work
a) The standard frame must be used but it can be braced and gusseted.
b) Body work may be replaced with aftermarket racing kits but must have the same silhouette as the original motorcycle.
c) Any swing arm may be used and it can be braced or reinforced, but must conform to 3.5 below.
d) Custom footrests, brackets and levers may be used.
e) Any handlebars may be used as long as they are deemed to be safe and from the period.
f) The original seat must be retained, but the padding can be shaped to suit the rider.
iii. Suspension
a) The original front forks and yokes must be used. Forks can be interchanged between different models of the same make from the same period. (* Proposed amendment for 2011 - Any forks and yokes may be used but up side down forks are not permitted – not ratified at this point*).
b) Internal fork components can be changed or modified. Front fork braces are allowed
c) Any rear shock absorber may be used. The mounting points on the frame and swing arm can be changed or moved as long as the original look of the bike is maintained. Twin shock models cannot be converted to monoshock.
iv. Wheels And Tyres
a) 17 inch rims may be used.
b) The rim width may be increased to suit larger section tyres. Alternatively, wider wheels from a different model may be used.
c) Tyres are limited to maximum 120 for the front and 160 for the rear, subject to clause 6 of the General Rules.
v. Brakes
a) Brake calipers can be changed to four piston calipers. Mounting brackets must be approved by the Technical Committee.
b) Brake calipers must be fitted to the mountings on the standard forks. Brackets may be used to adapt them.
c) The standard master cylinder may be replaced with a unit with a remote reservoir.
vi. Electrical
a) Alternators, starter motors and batteries may be removed or changed.
b) Any ignition system and coils may be used.
vii. Eligibility Of Motorcycles
a) All motorcycles built up to and including 1981.
b) The Technical Committee must approve motorcycles.
[hr]
This is the Rod Gray racer built, competed and won the South African F1 Championship back in 1982. This is a recent photo taken at one of the Classic bike events in South Africa.
Below are another two examples of XS1100 racer elsewhere in the world. These examples are built against different rules, but serves as inspiration for this build.
It will be piloted by multiple South African Superbike Champion and Springbok racer, Gavin Ramsay.
The general specification for the bike has already been drafted for preliminary costing / resource acquisition purposes, but I would like to invite all the members on this thread to participate in the establishment of the complete specification - with me - to be followed during the build. This thread will be posted in both the UK and USA forums at the same time, with a request to the Australian forum members that want to participate, to use either the UK or USA forums. Ultimately, with meaningful participation, and at the conclusion of these threads, there should exist a complete ‘how-to’ in building a world class Yamaha XS 1100 racer. To conclude, if / when built, the bike will proudly wear the ‘colours’ of the UK, USA and Australian forums.
The start point will be the Rules for the class - included below - that will form the baseline for the discussions. Please take a minute to read through the Rules, to familiarize yourself with the rules, before posting your input.
[hr]
CLASSIC SUPERBIKES REGIONAL CHAMPIONSHIP RULES
The purpose of these rules are to match the performance of motorcycles from different periods by specifying various levels of engine capacity, modifications, suspension and ability on the race track. This should result in a variety of different models competing on equal terms resulting in the declaration of a single Classic Superbike Champion.
1) General Rules
NOTE: What is not specifically permitted is disallowed.
i. Exhaust systems can be modified or replaced and must be fitted with a silencer.
ii. Air cleaners and air boxes can be removed or replaced with aftermarket units.
iii. Oil catch tanks must be fitted if the air box is removed. (refer to SSR 70)
iv. Steel braided brake hoses may be fitted.
v. Any type or make of brake pads may be fitted.
vi. Tyres must be standard road going tyres as imported by a recognised importer and be readily available to the public. Slicks are not permitted.
vii. Chains and sprockets are unrestricted.
viii. Headlights, taillights, indicators and surplus wiring may be removed.
ix. Steering dampers may be fitted.
x. Spark plugs are open.
xi. Lock wiring of sump plugs and front and rear brake caliper mounting bolts is required.
xii. Oil filter housings or spin on filters must be lock wired or clamped.
xiii. Oil coolers are permitted.
xiv. Side and centre stands must be removed.
xviii. Tyre warmers are not permitted.
2) Rider And Motorcycle Details
iii. It is the rider’s responsibility to notify the Technical Committee of any modifications made to his/her motorcycle (or spare motorcycles), which involve structural changes to the frame, swing arm, wheels, front fork yokes, and custom brackets used to mount brake calipers, and to ensure that these are recorded in the scrutineering book.
3) Eligibility Of Motorcycles
i. A member of the Technical Committee must inspect motorcycles before it can compete in Classic Superbike racing.
4) Categories For Classic Superbikes
i. Standard Production Motorcycles (1982 – 1985)
ii. Modified Production Motorcycles (up to and including 1981)
iii. Modified Production Motorcycles Classic 400 (1985 – 1999) 400cc four strokes and 250cc two strokes.
6) Modified Production Motorcycles (Class B)
i. Engine
a) Maximum capacity allowed is 1170 cc (*Proposed amendment for 2011 - Maximum capacity allowed is 1200 cc – not ratified at this point).
b) Any engine modifications are allowed.
c) Carburetors for 4 valves per cylinder engines must be 34 mm CV carburetors, for 2 valves per cylinder engines, the carburetors can be changed to round slide or smooth bore types of any size. Flat slide or Electron carburetors are not allowed. The carburetors may be modified.
d) The engine must look the same as the original from the outside.
e) Crash brackets and aftermarket covers can be used.
ii. Frame And Body Work
a) The standard frame must be used but it can be braced and gusseted.
b) Body work may be replaced with aftermarket racing kits but must have the same silhouette as the original motorcycle.
c) Any swing arm may be used and it can be braced or reinforced, but must conform to 3.5 below.
d) Custom footrests, brackets and levers may be used.
e) Any handlebars may be used as long as they are deemed to be safe and from the period.
f) The original seat must be retained, but the padding can be shaped to suit the rider.
iii. Suspension
a) The original front forks and yokes must be used. Forks can be interchanged between different models of the same make from the same period. (* Proposed amendment for 2011 - Any forks and yokes may be used but up side down forks are not permitted – not ratified at this point*).
b) Internal fork components can be changed or modified. Front fork braces are allowed
c) Any rear shock absorber may be used. The mounting points on the frame and swing arm can be changed or moved as long as the original look of the bike is maintained. Twin shock models cannot be converted to monoshock.
iv. Wheels And Tyres
a) 17 inch rims may be used.
b) The rim width may be increased to suit larger section tyres. Alternatively, wider wheels from a different model may be used.
c) Tyres are limited to maximum 120 for the front and 160 for the rear, subject to clause 6 of the General Rules.
v. Brakes
a) Brake calipers can be changed to four piston calipers. Mounting brackets must be approved by the Technical Committee.
b) Brake calipers must be fitted to the mountings on the standard forks. Brackets may be used to adapt them.
c) The standard master cylinder may be replaced with a unit with a remote reservoir.
vi. Electrical
a) Alternators, starter motors and batteries may be removed or changed.
b) Any ignition system and coils may be used.
vii. Eligibility Of Motorcycles
a) All motorcycles built up to and including 1981.
b) The Technical Committee must approve motorcycles.
[hr]
This is the Rod Gray racer built, competed and won the South African F1 Championship back in 1982. This is a recent photo taken at one of the Classic bike events in South Africa.
Below are another two examples of XS1100 racer elsewhere in the world. These examples are built against different rules, but serves as inspiration for this build.
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