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Gs1000 Bonneville Bike
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What do the rules state for head work? Specifically 2 ir 4 valves? Big difference. Correct me if I'm wrong, but if there is no written rule against it, its legal. When we roadraced "production" bikes this made for very imaginative and creative ways to go fasterLast edited by limeex2; 07-20-2017, 03:08 PM.Current Rides: 82 GS1100E, 00 Triumph 955 Speed Triple:twistedevil:, 03 Kawasaki ZRX1200, 01 Honda GL1800, '15 Kawasaki 1000 Versys
Past Rides: 72 Honda SL-125, Kawasaki KE-175, 77 GS750 with total yosh stage 1 kit, 79 GS1000s, 80 GS1000S, 82 GS750e,82 GS1000S, 84 VF500f, 86 FZR600, 95 Triumph Sprint 900,96 Triumph Sprint, 97 Triumph Sprint, 01 Kawasaki ZRX1200, 07 Triumph Tiger 1050, 01 Yam YFZ250F
Work in progress: 78 GS1000, unknown year GS1100ES
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Originally posted by GregT View PostGearing will be one of the problems. I have made up an 18T front sprocket for our GS1000 so as to give us a wider range of options for roadracing. Once you have your bike, I'd see what is the biggest front sprocket you can fit and work back from there. With a bigger front, you'll be looking at rear sprockets in available sizes which will fit on a stock cush drive.1978 GS1085.
Just remember, an opinion without 3.14 is just an onion!
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stevef.
Originally posted by GregT View PostGearing will be one of the problems. I have made up an 18T front sprocket for our GS1000 so as to give us a wider range of options for roadracing. Once you have your bike, I'd see what is the biggest front sprocket you can fit and work back from there. With a bigger front, you'll be looking at rear sprockets in available sizes which will fit on a stock cush drive.
Originally posted by limeex2 View PostWhat do the rules state for head work? Specifically 2 ir 4 valves? Big difference. Correct me if I'm wrong, but if there is no written rule against it, its legal. When we roadraced "production" bikes this made for very imaginative and creative ways to go faster
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Originally posted by GregT View PostGearing will be one of the problems. I have made up an 18T front sprocket for our GS1000 so as to give us a wider range of options for roadracing. Once you have your bike, I'd see what is the biggest front sprocket you can fit and work back from there. With a bigger front, you'll be looking at rear sprockets in available sizes which will fit on a stock cush drive.
(Well, they did last time I checked.)'20 Ducati Multistrada 1260S, '93 Ducati 750SS, '01 SV650S, '07 DL650, '01 DR-Z400S, '80 GS1000S, '85 RZ350
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Originally posted by limeex2 View PostWhat do the rules state for head work? Specifically 2 ir 4 valves? Big difference. Correct me if I'm wrong, but if there is no written rule against it, its legal. When we roadraced "production" bikes this made for very imaginative and creative ways to go faster
As always with racers and rulebooks, there will be "creative" interpretations.'20 Ducati Multistrada 1260S, '93 Ducati 750SS, '01 SV650S, '07 DL650, '01 DR-Z400S, '80 GS1000S, '85 RZ350
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80GS850GBob
"140mph"
-sounded to me like the guidelines said the engine had to be stock heads, crank and cylinders...{but are internal mods ok?...over bore, added stroke via other oem rods and shorter height aftermarket pistons}
-does the gearing have to be stock offered ratios?...or can you gear stiffer for top end speed?
-if you can't change gearing {much} can you go to taller rims/tires?...or both?
Bonneville is a long run game and average of three passes...as I recall.
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stevef.
Originally posted by 80GS850GBob View Post"140mph"
-sounded to me like the guidelines said the engine had to be stock heads, crank and cylinders...{but are internal mods ok?...over bore, added stroke via other oem rods and shorter height aftermarket pistons}
-does the gearing have to be stock offered ratios?...or can you gear stiffer for top end speed?
-if you can't change gearing {much} can you go to taller rims/tires?...or both?
Bonneville is a long run game and average of three passes...as I recall.
This is EXACTLY what the rulebook says. I don't see any mention of the rotating assembly or the valvetrain. Only that the design of the engine MUST have been in manufacture prior to 1981 and externally has to look more or less stock (obviously stated in more specific terms). I would like to avoid having to fight with them to allow an '82 (if they are in fact the same as earlier models) so I am sticking with looking for '80 and '81 models.
Gearing can be changed in any class per the rulebook.
Wheels can be changed in the chassis class which I am looking to compete.
Also, the speed is averaged over the center mile of the course and has to be averaged over two runs. This is done so that you can run both ways which negates any effect that wind could have on the run. So if the wind makes me go 150mph headed east, it could slow me down to 130mph when I head west and we will get the average.
There are different length courses depending on how fast you are able to go. I should theoretically be on the five mile course: two miles to build speed, one timed mile, and two miles to shut down. I could hit the center mile at 138, accelerate to 145 in that time, and my average will be somewhere in between. It's not about top speed, more about showing what type of speed you can maintain.
-LenLast edited by Guest; 07-28-2017, 10:05 AM.
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Looks like you'll only be moved to a higher displacement class if you overbore, however this may put you in the 1000cc class.1982 GS1100G- road bike
1990 GSX750F-(1127cc '92 GSXR engine)
1987 Honda CBR600F Hurricane
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stevef.
Originally posted by Buffalo Bill View PostLooks like you'll only be moved to a higher displacement class if you overbore, however this may put you in the 1000cc class.
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Originally posted by stevef. View Post"Classic Gasoline- The engines production date shall be prior to 1981...'20 Ducati Multistrada 1260S, '93 Ducati 750SS, '01 SV650S, '07 DL650, '01 DR-Z400S, '80 GS1000S, '85 RZ350
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stevef.
Originally posted by RichDesmond View PostI read that as 1980 and earlier. 1981 wouldn't qualify unless you can show that they were identical.
-Len
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Do you have any place that you can test?
This place is a lot closer than El Mirage or Bonneville
http://www.loringtiming.com/ They can't do real FIA records there, because they only race in one direction, and they doother reasons. A guy went over 300 on a sit down motorcycle there. It is paved. Obviously El Mirage and Bonneville are not. El Mirage is at 2800' elevation. Bonneville is at 4200' elevation. The elevation and the surface both slow down the speeds somewhat compared to what you might find on pavement.sigpic Too old, too many bikes, too many cars, too many things
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