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› Mechanically safe sustainable speed?
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Mechanically safe sustainable speed? (Read 427 times)
stewmills
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Re: Mechanically safe sustainable speed?
Reply #15 -
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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2008 | 152/52.5–Air Mix 3/4 | Rotella T4 | Seat Lift w/Sheepskin | Speedo Rattle | Rear Pulley Shim | 140/90-15 Rear | Kaw Front Pulley | Relocated Rear Signals
FREEDOM ISN'T FREE!
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batman
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Re: Mechanically safe sustainable speed?
Reply #16 -
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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«
Last Edit: 11/20/19 at 08:51:01 by batman
»
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WD
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Re: Mechanically safe sustainable speed?
Reply #17 -
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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batman
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Re: Mechanically safe sustainable speed?
Reply #18 -
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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my old work mates called me MacGyver
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Dennisgb
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Re: Mechanically safe sustainable speed?
Reply #19 -
11/22/19 at 21:44:49
WD wrote
on 11/22/19 at 13:57:37:
If you get it jetted correctly, you can start it w/o the “choke”.
In my experience if it starts without choke it’s running rich 😳
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Matchless G11
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Re: Mechanically safe sustainable speed?
Reply #20 -
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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ohiomoto
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Re: Mechanically safe sustainable speed?
Reply #21 -
11/23/19 at 15:12:02
Dennisgb wrote
on 11/22/19 at 21:44:49:
WD wrote
on 11/22/19 at 13:57:37:
If you get it jetted correctly, you can start it w/o the “choke”.
In my experience if it starts without choke it’s running rich 😳
----------
Agreed, but I say a cold start. Once warm, you shouldn't need the choke.
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Mavigogun
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Re: Mechanically safe sustainable speed?
Reply #22 -
11/25/19 at 08:42:37
WD wrote
on 11/22/19 at 13:57:37:
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.
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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2007 LS650 s40, presently being rebuilt
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Murphdawg
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Re: Mechanically safe sustainable speed?
Reply #23 -
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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ohiomoto
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Re: Mechanically safe sustainable speed?
Reply #24 -
06/19/21 at 06:17:38
Dennisgb wrote
on 11/22/19 at 21:44:49:
WD wrote
on 11/22/19 at 13:57:37:
If you get it jetted correctly, you can start it w/o the “choke”.
------------
In my experience if it starts without choke it’s running rich 😳
----------
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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Gary_in_NJ
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Re: Mechanically safe sustainable speed?
Reply #25 -
06/19/21 at 11:59:08
Those bike also have EFI.
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A life-time student of motorcycling.
LS650 Cafe, DRZ400SM, FZ6N, SV650S, CB900C, Ducati ST2, CB550F-SS
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ohiomoto
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Re: Mechanically safe sustainable speed?
Reply #26 -
06/20/21 at 18:18:33
Gary_in_NJ wrote
on 06/19/21 at 11:59:08:
Those bike also have EFI.
----------
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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Gary_in_NJ
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Re: Mechanically safe sustainable speed?
Reply #27 -
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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A life-time student of motorcycling.
LS650 Cafe, DRZ400SM, FZ6N, SV650S, CB900C, Ducati ST2, CB550F-SS
My LS650=>
http://suzukisavage.com/yabb2.2/Attachments/Left.JPG
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