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RadioPassive posted:Does this work? Should I hook up my welder and try this on my KLR this winter? My sarcasm meter is broken tonight, but that's an obvious photoshop. Pokey Araya posted:Dude won this with a $25 raffle ticket at Giddy Up this year. Give it front brakes/fender and I'd ride it  For some weird reason I have been missing my old 833 lately.
The Royal Nonesuch fucked around with this message at 04:18 on Jul 20, 2016 |
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Jul 20, 2016 04:16
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Slavvy posted:Ugly and italian and therefore not entirely water- or fire-resistant. Would unironically buy this.
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Jul 20, 2016 06:06
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 What's this? Friend saw it in Bart alone uh E and this 
A MIRACLE fucked around with this message at 06:11 on Jul 20, 2016 |
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Jul 20, 2016 06:07
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First is a Yamaha, second is a BMW R850R. MT-03
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Jul 20, 2016 06:43
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Yamaha MT03 you bastard ola
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Jul 20, 2016 06:44
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goddamnedtwisto posted:80 mph out of a 3.5hp 250cc motor is... impressive. 0-60 in 30 seconds, an additional minute and no headwind required for each further 5mph. goddamnedtwisto posted:Particularly with that front end. Jesus. Notice the thumb control on the left bar to change the timing, something you'd have to do constantly. Change the spark timing you mean? Like, have it trigger earlier at higher rpm? Is that something modern bikes still do but automatically somehow?
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Jul 20, 2016 06:46
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Renaissance Robot posted:
Yes. A modern engine is just as basic as those museum bikes, it just has automated some of the admin.
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Jul 20, 2016 06:53
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Renaissance Robot posted:0-60 in 30 seconds, an additional minute and no headwind required for each further 5mph. Yeah, that - although by the twenties engines were starting to have rpm-dependent timing advance, so it's possible that this one does and the timing change is just to account for the very variable quality of pump fuel at the time.
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Jul 20, 2016 06:55
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Is this supposed to be "5 or 6" HP or were they really only able to get 5/6th of a HP out of an 800cc engine... that seems really low even for the 20s
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Jul 20, 2016 08:47
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ADINSX posted:Is this supposed to be "5 or 6" HP or were they really only able to get 5/6th of a HP out of an 800cc engine... that seems really low even for the 20s They're meaning it comes in 5 or 6 horsepower variations. According to my 1913 motorcycling manual a 6hp bike is a heavyweight bike with a powerful engine 2-4 cylinder engine, often used with a side car, ideally optionally fitted with a 2-speed trans and a clutch. If you project development forward by a decade 5-6hp seems like what a middleweight bike with a v-twin would have. With aforementioned manual timing advance. Prehistoric bikes are strange beasts.
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Jul 20, 2016 08:59
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I like going to antique vehicle shows where they show the vehicles moving under their own power, mostly to watch them getting started. It's always entertaining to watch the five minute ritual required to get those old machines started. We're spoiled with being able to jump on a bike, push a button and go.
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Jul 20, 2016 09:43
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Slavvy posted:They're meaning it comes in 5 or 6 horsepower variations. According to my 1913 motorcycling manual a 6hp bike is a heavyweight bike with a powerful engine 2-4 cylinder engine, often used with a side car, ideally optionally fitted with a 2-speed trans and a clutch. If you project development forward by a decade 5-6hp seems like what a middleweight bike with a v-twin would have. With aforementioned manual timing advance. Prehistoric bikes are strange beasts. I think it's actually that it's a 6hp engine, but it's only 5 RAC horsepower, used for tax purposes and calculated by the dimensions of the engine. That's normally what that notation means on cars of the era, anyway.
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Jul 20, 2016 09:46
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Collateral Damage posted:I like going to antique vehicle shows where they show the vehicles moving under their own power, mostly to watch them getting started. It's always entertaining to watch the five minute ritual required to get those old machines started. I'm at work right now, somebody find the [five minute long] video of them trying to get this thing started: 
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Jul 20, 2016 10:49
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Collateral Damage posted:I like going to antique vehicle shows where they show the vehicles moving under their own power, mostly to watch them getting started. It's always entertaining to watch the five minute ritual required to get those old machines started. Hello sir can I interest you in this exciting new italin brand called Ducati
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Jul 20, 2016 12:51
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Renaissance Robot posted:Change the spark timing you mean? Like, have it trigger earlier at higher rpm? Is that something modern bikes still do but automatically somehow? Yeah. The fuel charge takes a more or less constant time to burn and expand, but you always want the bulk of the expansion to be happening at the same point in the engine stroke for maximum power. When the engine is turning slowly, you need to ignite the fuel pretty close to when the piston is at top-dead-center on its compression stroke or even a little bit afterwards, so that the piston is just starting to move down as the charge expands. As the engine speeds up, if you continue to spark at top-dead-center, the piston will have already moved partway down on inertia by the time the charge starts to push, so you waste a bunch of power. Instead you fire the spark slightly before the piston hits the top ("timing advance") and the fuel gets going in time for the power stroke to take advantage of it. Then when you slow down, you have to put the timing back where it was, because advanced timing at low engine speeds means the charge will already be burnt before the piston reaches the top of the compression stroke. Best case it knocks, worst case the engine stalls or blows up. People were also talking about kick starting and adjusting the timing. If you have your spark at TDC or somewhat advanced and your engine is running really slowly, so there's no flywheel inertia to carry it forwards -- for instance, if you are just starting the engine -- there's a chance that the fuel igniting on the upstroke will push the piston backwards. Because of the way kick starters are geared, when this happens the starter lever will kick upwards hard, and depending on the size of the engine and how unlucky you are it might sprain your ankle or blow out your knee or launch you off the bike. So as a safety strategy, you set the spark to fire way late in the power stroke, when the piston is already heading down ("timing retard") and that prevents any kickback. Once it's running you quickly return to normal timing. By the 1940s, bikes were starting to get mechanical advancers that adjust the timing automatically using a set of weights and springs. As the advancer spins faster, the weights fly out to the side (think of the spinny ball governor on top of a train) and push a set of cams that move the ignition points to fire earlier, advancing the timing. As the engine slows down, the springs pull the advancer arms back in and the timing retards. Here's a nice little video of how that works: https://www.youtube.com/watch?v=RcmkbQVPz9E&t=50s Early electronic ignition systems still used mechanical advancers, but replaced the points with a magnetic pickup and a small microprocessor. Later electronic ignition uses a crankshaft position sensor and a lookup table that fires each spark at the correct time based on crank position, engine speed, engine load, throttle position, fuel quality, etc. for maximum power and efficiency. 
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Jul 20, 2016 16:10
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Collateral Damage posted:I like going to antique vehicle shows where they show the vehicles moving under their own power, mostly to watch them getting started. It's always entertaining to watch the five minute ritual required to get those old machines started. I like the little rituals. It makes me feel sort of like a fighter pilot. Even my CL350s have a few things you have to go through: Get on bike Turn key Headlight on Open petcock Choke on Killswitch on Flip out kick starter Kick bike Blip throttle once or twice for effect Visor down Kickstand up Vroom
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Jul 20, 2016 16:15
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Sagebrush posted:it might sprain your ankle or blow out your knee or launch you off the bike. Some jerk advanced the timing (Dyna) on this YZ450 with a broken decomp lever. He brought it into the shop saying he was having trouble getting it started. So, first thing I do is give it a quick kick and it rolls through the cycle. Then I really jump on it, the bitch fires about halfway through the stroke, and the kickstarter launches me rear end-over-kettle.
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Jul 20, 2016 16:27
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Sagebrush posted:I like the little rituals. It makes me feel sort of like a fighter pilot. Even my CL350s have a few things you have to go through: Engine starting ritual: https://www.youtube.com/watch?v=VEurohAwrmA&t=45s
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Jul 20, 2016 16:31
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Bikes admittedly the easiest start in the fleet. essentially hop and go. Takes about an hour to ready the bus for running..
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Jul 20, 2016 16:42
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Collateral Damage posted:Well obviously, but there's only one or two steps to actually get the engine started. The blip throttle for effect step is important though. Someday I would like to build a motorcycle that starts with an inertia starter. Totally unnecessary on a small engine, of course, but dat sound  https://www.youtube.com/watch?v=kd_xVtcG5Dc&t=164s
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Jul 20, 2016 16:55
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Sagebrush posted:Someday I would like to build a motorcycle that starts with an inertia starter. Totally unnecessary on a small engine, of course, but dat sound When I first discovered inertial starters, the sound absolutely flabbergasted me, because dammit, that's a broken hyperdrive!.
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Jul 20, 2016 17:38
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A MIRACLE posted:Just get a VMAX, those are pretty comfortable  Flail wildly into oncoming traffic...in comfort.
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Jul 21, 2016 17:15
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Collateral Damage posted:Well obviously, but there's only one or two steps to actually get the engine started. The blip throttle for effect step is important though. This is amazing. How many old farmers just stuck their half-smoked cigarette into the cylinder instead?
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Jul 22, 2016 13:26
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Pre-K Bikini Carwash posted:
Here's a cool one for sale http://orlando.craigslist.org/mcy/5693424780.html
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Jul 22, 2016 13:38
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Harley Killer
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Jul 22, 2016 13:41
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Renaissance Robot posted:Harley Killer I'm hoping murder suicide.
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Jul 22, 2016 14:40
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No. 6 posted:Here's a cool one for sale I'm the Imperial Japanese rising sun on the tank and the (American) Flying Tigers shark mouth on the side, I guess.
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Jul 22, 2016 19:57
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No. 6 posted:Here's a cool one for sale craigslist posted:odometer: 3585 wow, that can't be right can it?
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Jul 22, 2016 20:54
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Sagebrush posted:I'm the Imperial Japanese rising sun on the tank and the (American) Flying Tigers shark mouth on the side, I guess. Sixth grade me thinks that poo poo is the coolest. He also liked Smashmouth, and missed out on the Attitude Era because he was busy yelling about how fake wrestling was, while the Matrix was his favorite movie.
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Jul 22, 2016 22:00
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Just the shark teeth intake would have been cool though.
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Jul 22, 2016 22:04
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The fake gauges on the carb slide caps are intensely annoying but other from that it's pretty cool IMO.
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Jul 22, 2016 22:15
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Sagebrush posted:I'm the Imperial Japanese rising sun on the tank and the (American) Flying Tigers shark mouth on the side, I guess. I'm the clubman bars on a muscle cruiser I'm pretty sure that's all printed on vinyl, so at least it's easy to remove.
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Jul 22, 2016 23:16
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Here's a T-shirt designed by someone who does not know motorcycles.  Under the sticker says "ignition circuit breaker" and is pointing to the cylinder head.
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Jul 23, 2016 00:11
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Deeters posted:Here's a T-shirt designed by someone who does not know motorcycles. Thank God, they labeled the headlight!
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Jul 23, 2016 00:20
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Hahahaha, I have a pic of the same shirt, forgot to post it
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Jul 23, 2016 01:34
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Gas cap = Spark advance Also the horn is in the gas tank.
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Jul 23, 2016 02:31
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I kind of want that shirt now for the same reason that these are hilarious
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Jul 23, 2016 02:36
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Safety Bae is the best part
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Jul 23, 2016 02:37
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Space Whale posted:Safety Bae is the best part It says "safety bar", not that really makes any sense
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Jul 23, 2016 02:52
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https://www.youtube.com/watch?v=sOq5lSUh8Wo
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Jul 23, 2016 06:51
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