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SuzukiSavage.com
/cgi-bin/YaBB.pl General Category >> Rubber Side Down! >> Mechanically safe sustainable speed? /cgi-bin/YaBB.pl?num=1572975263 Message started by Mavigogun on 11/05/19 at 09:34:23 |
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Title: Mechanically safe sustainable speed? Post by Mavigogun on 11/05/19 at 09:34:23 Sure, it depends- but now that I've lost the stock petcock, my engine isn't running lean. I figure it was harder on the engine running lean at 80 indicated than with appropriate fuel flow at 90 indicated. At 100 on the dial, I've still got throttle left. The bike seems plenty stable at speed, and vibration isn't onerous at 90- aside for left and right side head covers bolts backing out. Understanding that left to idle is a bad thing, I presume that holding the engine at some speed markedly hastens mechanical death, too... but it's winter, the block is naturally cooler- -what do you think? Is driving XC at indicated 90 courting certain doom? |
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Title: Re: Mechanically safe sustainable speed? Post by ohiomoto on 11/05/19 at 09:46:11 Not at all the same as letting it idle. You'll have much more oil pressure and airflow for cooling at 90 mph. |
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Title: Re: Mechanically safe sustainable speed? Post by justin_o_guy2 on 11/05/19 at 10:18:39 Oil gets blown out at high RPM. |
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Title: Re: Mechanically safe sustainable speed? Post by Mavigogun on 11/05/19 at 10:22:43 4E5157504D4A7B4B7B43515D16240 wrote:
Good point. Through the air box, right? I've taken to bringing supplemental oil with me on long hard rides. If I put a thousand miles on in a week end, it's going to want a drink. |
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Title: Re: Mechanically safe sustainable speed? Post by DragBikeMike on 11/05/19 at 12:35:01 You intend to ride 1000 miles at an average speed of 90 mph? In two days? |
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Title: Re: Mechanically safe sustainable speed? Post by Mavigogun on 11/05/19 at 13:58:10 Oh, no- that seems... extreme. I doubt I have the concentration for it. I could see holding 70-80 actual mph for the contents of a tank, though, on the right roads. 20 hours of riding in a couple days happen on occasion, holding 70+ for 3-4 hours at a stretch... well, with gas breaks. I wonder, if lubrication and overheating are in check, does high speed operation have other unavoidable impacts on the engine? Indicated 90 is closer to 82 actual- I'm just looking for educated expectations. |
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Title: Re: Mechanically safe sustainable speed? Post by verslagen1 on 11/05/19 at 14:25:45 I wouldn't do it in the heat of summer. No problem up to 80°/90° after that, don't stop, the engine heats up quickly. |
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Title: Re: Mechanically safe sustainable speed? Post by Armen on 11/05/19 at 15:23:22 Look at Drag Bike Mike's breather thread. One smart way to reduce oil consumption. IIRC, if you reduce a bearing's RPM by 10%, you double it's life. So, revving the crap out of an engine isn't a good thing. Having said that, these bikes rarely see 7,000 RPMs, which isn't much for a modern motor. Real oil, deal with the breather, and ride... |
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Title: Re: Mechanically safe sustainable speed? Post by Eegore on 11/05/19 at 16:09:26 Have you changed the front pulley out? That is great for longer higher speed rides, and replacing the rear is even better. |
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Title: Re: Mechanically safe sustainable speed? Post by Mavigogun on 11/05/19 at 16:21:52 4E6E6C64796E0B0 wrote:
By "rear pulley", do you mean swapping out the belt for a chain and sprockets? I'm clueless as to the front. Or maybe clueless, full stop. |
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Title: Re: Mechanically safe sustainable speed? Post by Armen on 11/05/19 at 17:11:00 Look in the marketplace section. Modified front Kawi pulley. 2 more teeth Lower revs at cruising speed. All the cool kids use 'em. :-) |
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Title: Re: Mechanically safe sustainable speed? Post by batman on 11/05/19 at 17:20:43 I would strongly urge you to make sure you've jetted the carb correctly before running at higher highway speeds , 75mph (actual) all day, is not beyond the bikes capability and will leave you some throttle to maneuver/pass . The danger exists if your running lean, you can over heat and drop an exhaust valve , or blast metal off the dome of the piston to the point of holing it. Running slightly rich will make the motor run cooler , you may have a bit of carbon build up on the plug (it can be cleaned and reused) you'll have less chance of after fire and no serious damage of any kind. All jets are cumulative, if your running lean at anything passed 1/4 throttle ,you'll still be lean at 90. I completed a round trip from N. Y. to Tn. 2,100 miles in 4 days under just the conditions we're talking about here. Be sure to do the spacer mod ,it will cure your lean mid range and improve your actual top speed to 85-87 mph. |
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Title: Re: Mechanically safe sustainable speed? Post by Eegore on 11/06/19 at 06:30:55 Look at the front/rear pulley threads. The images don't work but the information is accurate. It's not a chain conversion, it's replacing pulleys with different tooth counts. http://suzukisavage.com/cgi-bin/YaBB.pl?num=1547122232 |
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Title: Re: Mechanically safe sustainable speed? Post by Dave on 11/07/19 at 03:32:40 Looks like I can get most of my photos back if I use Google Search. https://www.google.com/search?sxsrf=ACYBGNTkjkexnkKPF_oqaIQi919eEZS57g:1573125968410&q=suzuki+savage+kawasaki+pulley&tbm=isch&source=univ&client=firefox-b-1-d&sxsrf=ACYBGNTkjkexnkKPF_oqaIQi919eEZS57g:1573125968410&sa=X&ved=2ahUKEwi7t6L0_tflAhWsUt8KHUrcDocQsAR6BAgIEAE&biw=1920&bih=966#imgdii=ibkle7KQ86fs9M:&imgrc=zmLWxq8r2LNuPM: Below is a 25T Kawasaki pulley modified to replace the 23T Suzuki Pulley. It won't increase your to speed - it reduces the engine rpm at cruise in high gear. |
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Title: Re: Mechanically safe sustainable speed? Post by Mavigogun on 11/19/19 at 06:43:30 675C5146575B40465D555847340 wrote:
Cool- thanks for the link. So, do I understand correctly- the RPM of the engine will be reduced, but the power output will stay more or less the same as the rear wheel is turned more per stroke? |
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Title: Re: Mechanically safe sustainable speed? Post by stewmills on 11/19/19 at 07:36:38 I don't know the 'math' (Dave can tell you), but what is happening is what you said...the larger front pulley pulls a slightly faster rotation on the rear wheel so it takes slightly less RPM to go the same speed. Since this bike has such great torque, the effect on the torque is negligible. At first you notice that 1st gear is 'taller' and you have to feather the clutch a tad more to get rolling smoothly and the shift pattern is different (in a good way...smoother), but once you get adjusted to it (very quickly) it makes you wonder why the bike wasn't made that way. If you get one and need the instructions I put together to install yours, I can dig up the photos and reload them. They were killed when inypic shut down. http://suzukisavage.com/cgi-bin/YaBB.pl?num=1484806731 |
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Title: Re: Mechanically safe sustainable speed? Post by batman on 11/19/19 at 23:25:52 The math for the front pulley : 23/25= .92 or 92% 60 mph =4008 rpm (stock) (60 x66.8 =4008) 60 mph =4008 X.92 = 3687 (kawa front pulley) Motor rpm reduced by 321 rpm @60 mph (60 x61.456 = 3687) 66.8 & 61.456 being the motor rpm to =1 mph in each case (in 5th gear) (4 speed bikes the number 66.12 stock-in 4th gear) the 8 % reduction in motor speed should show an ALMOST equal gain in mpg. |
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Title: Re: Mechanically safe sustainable speed? Post by WD on 11/22/19 at 13:57:37 My daily rider turned parts bike turned dirt track project has 155 main and 55 pilot jets. White spacer not touched. At 1/2 “choke” Pokey could “roll coal” like an old 2 stroke diesel. If you get it jetted correctly, you can start it w/o the “choke”. If you plan on any real distance riding, upgrade the rear shocks. Add a front mudflap. Raise the front of your seat. Add an HD-01 windshield, set perfectly vertical. You might want a set of Evo RoadKing handlebars in taller risers. Both of mine had a full rear fender conversion... |
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Title: Re: Mechanically safe sustainable speed? Post by batman on 11/22/19 at 15:05:57 If you plan on any real distance riding, upgrade the rear shocks. Add a front mudflap. or use a Harley Sportster front fender, It's rear curves much nearer to the ground and keeps all road spray off your boots and shins. |
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Title: Re: Mechanically safe sustainable speed? Post by Dennisgb on 11/22/19 at 21:44:49 7162260 wrote:
In my experience if it starts without choke it’s running rich [ch128563] |
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Title: Re: Mechanically safe sustainable speed? Post by Matchless G11 on 11/23/19 at 03:46:53 Running too rich is bad, You can "wash" off the oil off the cylinder wall. causing wear. In the 1960s there was a report in "Cycle"? magazine where they found out that most ring problems were caused by too rich a mixture. If your oil smells gassy you are too rich. (or you haven't upgraded your petcock) :( |
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Title: Re: Mechanically safe sustainable speed? Post by ohiomoto on 11/23/19 at 15:12:02 323338383F253134560 wrote:
In my experience if it starts without choke it’s running rich [ch128563][/quote]---------- Agreed, but I say a cold start. Once warm, you shouldn't need the choke. |
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Title: Re: Mechanically safe sustainable speed? Post by Mavigogun on 11/25/19 at 08:42:37 0211550 wrote:
It feels like the stock shock suffers at the start- especially when gunning around a tight corner, where the back end seems to squish and shift sideways; is that something I should expect to be confronted by a shock upgrade? I'd like to keep myself as low as possible on the bike, often find myself crouched forward over the tank at high speeds (70's-90's). I removed the Boulevard-branded wind screen after 2k miles, and am mostly happier without it, will likely fit a very small cowling to deflect wind to the helmet, keeping cold air off the chest in the at-speed-position and supporting my head. A hang glider pilot, I like to feel the wind. I like the rumble and vibration of the bike. These things let me know I'm not on the couch -that I'm alive, flying down the road, clutched atop a machine. |
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Title: Re: Mechanically safe sustainable speed? Post by Murphdawg on 06/19/21 at 06:02:40 Hey WD, I was not able to PM you until I have more posts so I’m just commenting on one of yours. A while back you commented on a hardtail question and showed some curved struts. They look a heck of a lot better than normal struts as they curve and mount in shock location giving an appearance of a legit hardtail. Just wondering what these are called and where I can get them?? Thanks a lot and apologies if I’m handling this out of procedure. |
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Title: Re: Mechanically safe sustainable speed? Post by ohiomoto on 06/19/21 at 06:17:38 727378787F657174160 wrote:
------------ In my experience if it starts without choke it’s running rich [ch128563][/quote]---------- As is rolling coal with a 4-stroke. Watch a Pro Motocross or Supercross race (the all run 4-strokes these days) and you won't see a puff of smoke...ever. ::) |
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Title: Re: Mechanically safe sustainable speed? Post by Gary_in_NJ on 06/19/21 at 11:59:08 Those bike also have EFI. |
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Title: Re: Mechanically safe sustainable speed? Post by ohiomoto on 06/20/21 at 18:18:33 5852565C575E5A530D0B0F3F0 wrote:
They didn't when the first hit the scene (and they didn't smoke) and the system can be tuned with a computer/phone app. They can make them as rich as they want, but they don't. My point is anyone saying the run rich enough to roll coal is talking silly. ::) |
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Title: Re: Mechanically safe sustainable speed? Post by Gary_in_NJ on 06/21/21 at 03:42:58 Agreed. And yes, modern dirt bikes are marvelous machines. I love riding a 2 stroke, but I’m faster and have more confidence (especially on the face of a jump) on a 4 stroke. |
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