Fastest (observed) speed on XS11

[Cabasa]

Ok still new to this whole thing so let me ask a dumb question. Was the XS suppose to be the first really fast bike? If it is, then I just got lucky in picking it up. Friends brother moved back east and wanted it gone. Got it up to 80 really fast, but decided that wasn't good for a beginner. I did smoke that Sportster though!

[TopCatGr58]

Is it fast!?

Hey there Cabasa,

Yes, the XS11 was the first production bike to break the 11 or 12 second 1/4 mile barrier fully stock, and that's supposed to be the real origin of the name, not because of 1100 CC's, but because of this time performance!! Congrats on your muscle bike from the '80s! Ride safe, but have some fun!!!!

[auxtian]

Doing 200K coming from Adelaide to Sydney on XS1100G....and not for long... but it was raining and I'm tooooo old.

[nater_bug]

On my '79 XS 11 special with 35xxx miles, I hit 135 mph. Got there fast and had plenty to go. I have a K&N stock replacement filter, 4-1 Kerker exhaust, a windshield, and lots of time tuning.

My father's '80 XS 11 Special with ~15,xxx is stock and will do just about everything mine does. Just takes longer!

[Robert Haller]

Originally posted by nater_bug
On my '79 XS 11 special with 35xxx miles, I hit 135 mph. Got there fast and had plenty to go. I have a K&N stock replacement filter, 4-1 Kerker exhaust, a windshield, and lots of time tuning.

What tuning specifically, have you rejetted the carbs? I have a similar set-up but have not changed jets.

[nater_bug]

Robert,

I haven't rejeted it. I have spent a lot of time sync'n the carbs and messing with the idle mixture. I have all new main jets in it, but I still need to replace the pilots. I got everything really dialed in to run open roads, not really a city driver though.

I am going to try to dyno it in the spring at a local shop to see what it is really making. There is also a possibility after I finish school to get another XS and put EFI on it!

[Shuriken]

That's what I'm always interested in - dyno results. I'd like to see a "before" and "after" dyno test with stock and later with big-bore...

Ben

[ACE]

So can any one tell me what 6700 rpm would be in mph in 5th gear.
It's starting to snow here and i don't want to ride it today for a test!

[2fast]

Speed error

I rode quite a bit with a high quality GPS (StreetpilotIIIColor) last summer and found that that speed indicated on the xs11 speedo runs about 5-10 mph faster than you are really going. Did a bit of comparing with with some other types of bikes as well and found that they were off by similar amounts. It made me wonder if the manufacturers do this intentionally to make riders think they are riding faster than they are?? When use the GPS in cars, the speeds match almost exactly.

[chopper]

hi nater_ bug,about efi, i have noticed that quite a few guys fit a bank of 4 carbs to cars rather than the efi that comes with them,not just backyard tuners either...you would need to replace the cdi for a mappable unit,its an interesting idea i dont think its worth doing apart from the pleasure of being the first(possibly) as i imagine the time and cost far outway any benefit...just my thoughts! dont let me put you off.....

[Cabasa]

You guys ever hear of a megasquirt fuel injections system? Name is crude, but from what I hear it can be adapted to just about anything. I have heard about guys putting these on bikes, mostly Harleys. I played with the idea of fitting one on the XS. Best part is the system is supposably really inexpensive, but you know how that goes. Just my .02 cents.

[nater_bug]

I have heard of megasquirt before. You can do a search on yahoo and get most of the plans I think. One of the problems with this system is that it can be slow. The reaction time to the rpms of the computer might not keep up with the motor. That is one of the problems that we have found with our Formula SAE racecar. We didn't use this computer, but one similar. They are a good economical choice and do use much of the original hardware for cars.

There can be some complications to putting EFI on a bike, but unlike a car we would be able to run a throttle body for each cylinder with the injector installed on the throttle body. With some of the new computers out, like the Motec M4 or the TEC III it is fairly simple to program and they are a learning computer where the more you drive the bike the better it would run. I am going to mess with the M4 on a 400cc Honda engine this spring and see how it works for our schools Formula Car. If your interested our site is http://www.engr.siu.edu/staff2/sae

[Shuriken]

Keep us posted on the EFI stuff. It would be really interesting to see if there is a solution that would provide more precise and efficient fuel delivery and yet not sacraficing any performance....

Ben

[JP]

Late to the table

During my ironbutt ride, I rode at about 115 mph for about 30 minutes on Hwy 59 (between Gillette and Douglas, WY) - slowing for towns, of course.

It was slightly windy and I didn't like the handling above that speed. This is not recommended for anyone without extended gas capacity. Fuel economy suffers and there's not a lot of options along the way.

I felt safe enough doing this because I had about 5 miles visibility in both directions and the road was almost completely deserted. I might have seen one car every 5-10 minutes.

[Shuriken]

That reminds me, actually....

I was driving back home in the cold on one occasion. I had put on my light-duty rain coating to help cut the wind and moisture. Well this was a cheap Wal Mart Stearns jacket and pants about as thin as saran wrap..... anyway, I pushed the bike to 120 a couple of short times. When I got home I realized why my legs were cold. There were no pants from my nees down - they had shredded in the buffeting wind.

I think for high speed on this bike even the smallest winshield is a necessity.

Ben