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› Mechanically safe sustainable speed?
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Mechanically safe sustainable speed? (Read 427 times)
Mavigogun
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Mechanically safe sustainable speed?
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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ohiomoto
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Re: Mechanically safe sustainable speed?
Reply #1 -
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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justin_o_guy2
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Re: Mechanically safe sustainable speed?
Reply #2 -
11/05/19 at 10:18:39
Oil gets blown out at high RPM.
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Mavigogun
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Re: Mechanically safe sustainable speed?
Reply #3 -
11/05/19 at 10:22:43
justin_o_guy2 wrote
on 11/05/19 at 10:18:39:
Oil gets blown out at high RPM.
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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DragBikeMike
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Re: Mechanically safe sustainable speed?
Reply #4 -
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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Mavigogun
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Re: Mechanically safe sustainable speed?
Reply #5 -
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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verslagen1
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Re: Mechanically safe sustainable speed?
Reply #6 -
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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Armen
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Re: Mechanically safe sustainable speed?
Reply #7 -
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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Eegore
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Re: Mechanically safe sustainable speed?
Reply #8 -
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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Mavigogun
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Re: Mechanically safe sustainable speed?
Reply #9 -
11/05/19 at 16:21:52
Eegore wrote
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.
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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Armen
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Re: Mechanically safe sustainable speed?
Reply #10 -
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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batman
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Re: Mechanically safe sustainable speed?
Reply #11 -
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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Eegore
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Re: Mechanically safe sustainable speed?
Reply #12 -
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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Dave
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Re: Mechanically safe sustainable speed?
Reply #13 -
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:157312...
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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Pulley.jpg
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Mavigogun
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Re: Mechanically safe sustainable speed?
Reply #14 -
11/19/19 at 06:43:30
Dave wrote
on 11/07/19 at 03:32:40:
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.
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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