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Buell Motorcycle Forum » Quick Board Archives » Archive through June 16, 2004 » Question about sustained RPM level of 4K « Previous Next »

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Jon
Posted on Monday, June 14, 2004 - 09:21 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

Is that taxing my injected X1 (2001)? When moving in traffic on the freeway, I like to growl along at about 4k or even a little above. I like to keep the bike snappy in the upper rpms for a couple of reasons.


Anything to be concerned about?
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Smoke
Posted on Monday, June 14, 2004 - 09:31 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

running out of gas? 4000 rpm sustained should be no problem.
tim
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Koz5150
Posted on Monday, June 14, 2004 - 09:33 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

I found that my 2002 M2 loves that RPM range. I ride to my parents house (100 miles) and unless I am doing over 70 I never touch 5th gear. You may want to check into a 26 tooth front sprocket. It gives you higher RPM's so you don't have to chug around in 25 mph zones.
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Andys
Posted on Monday, June 14, 2004 - 10:28 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

"4000 rpm sustained should be no problem."

So one would think. You're throwing around 3.5 inch pistons in a motor that isn't balanced the best to begin with. Cut it some slack.

Click up to 5th and use more throttle instead. Bet your fuel mileage increases significantly and you'll learn a different way to get the response you like and you'll add miles to the life of your motor.

Just a different viewpoint.
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M1combat
Posted on Monday, June 14, 2004 - 11:08 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

uhhh, yeah... Any time you cruise put it in fifth...
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Blake
Posted on Tuesday, June 15, 2004 - 06:58 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

4,000 rpm is nothing to worry about, but I usually shift into 5th between 55 and 60 when I'm just cruising along. Fifth gear is more efficient and better for fuel mileage and engine wear.

My engine is balance though. I suspect that if you remove the flywheel and crank lobes, you would have problems. ; ) (Just teasing my buddy Andy)
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Koz5150
Posted on Tuesday, June 15, 2004 - 07:18 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

I have just nticed that the bike runs much smoother between 3500 and 5000 instead of lugging around under 3000.
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Phillyblast
Posted on Tuesday, June 15, 2004 - 08:14 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

Jon,
Not an expert, but shouldn't in my experience be a problem. I've done some sustained high speed interstate runs, like Denver to Philly, etc. and spent all day at 90 or so (indicated : ) ) without a problem. Still got 45 mpg (since we're teasing Andy)
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Blake
Posted on Tuesday, June 15, 2004 - 09:01 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

I agree with Koz, I would not run a Buell 1200cc engine below 3k rpm for any length of time.

Busting on Andy is good. He sold his Buell.
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Andys
Posted on Tuesday, June 15, 2004 - 11:46 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

Busting on Andy is good.

Yes it is!

I have just nticed that the bike runs much smoother between 3500 and 5000

Erik does nice work, doesn't he?
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Blackbelt
Posted on Tuesday, June 15, 2004 - 12:43 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

i ride 72 miles one way to work everyday, i stick it in 5th gear and at 4k i am doing about 83MPH. i can get to work in just over an hour depending on traffic... hasn't hurt my bike yet. 2002 X-1, and i just about to turn 20,000 miles..
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Newfie_buell
Posted on Tuesday, June 15, 2004 - 12:47 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

Ride mine in that range all the time,

As long as it can stay cool (no problem around here) it should be OK.
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Fullpower
Posted on Tuesday, June 15, 2004 - 01:58 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

i ran an xb over 4000 rpm for 1000 miles, stopping only for fuel and beverages a few weeks ago. elapsed time 22 hours, no apparant damage to the bike. i have had a few sustained hi speed runs of 1300 miles on a 1998 sportster with a 4-5/16 stroke. that motor has been held above 4000 rpm for over an hour on many many occasions. it has held up for 5 years of very heavy, sustained abuse. it still has 205 psi of cranking pressure, but it will use half a quart of oil on a hard weekend. so these are some real tough engines, the stock stroke motors love to rev.
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Jon
Posted on Tuesday, June 15, 2004 - 04:03 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

Thanks for the input guys. I would assume that I the same answers apply to all gears that I might be in at any given time?

Cheers!
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Bomber
Posted on Tuesday, June 15, 2004 - 04:09 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

engine doesn't care about gear selection, particularly . . .. .you could scoot along all day long at 4K in 1st, if ya wanted to . . . .

like, if you lost part of your shifter and were stuck in first and the nearest hardware store (thank goodness for inch size fasteners in the local ACE) was 10 mile away . . . .

you know, as a for instance
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Andys
Posted on Tuesday, June 15, 2004 - 09:49 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

Don't get me wrong boys, I like nothing better than spinning up the motor myself. Hell...I was bouncing the motor off the rev-limiter at 50 miles on my S1W!

I'm so use to the high RPM Hondas that I own I was always running out of revs when I rode the Buell. But what I always wanted to try was to drop the gearing (keeping the belt drive made gearing changes expensive, but I loved that belt on the street). I had a 29/62 gearing on my S1W and after the motor was putting out 90HP I wanted to throw on a 27T sprocket (from an S3) and see how the motor reacted.

I always felt that once we got the motor properly setup (got back the missing midrange due to the EPA) we could gear them down and slow up the motors a bit to save them and yet lose nothing because of the filled hole in the mid RPM band (2500-3500RPM). I just think there is no need to turn these motors so fast (3000RPM=60MPH) when 1000RPM less would work just as well when we are commuting to work.

Of course a 6 speed gearbox would do the trick, but I didn't have $4000. But if my experience with my Paso is any indication twins like being geared down as they produce more power. Wish I had tried it.

Somebody want to try?
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Charlieboy6649
Posted on Tuesday, June 15, 2004 - 11:50 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

Is the XB any better balanced??? I ran 90 mph all the way from Yuma, AZ to San Diego, CA which put my beast at 5000 all the way.

She was smooth as hell and really seemed to like being there (every time I slowed to 85, I'd look back down and was doing 90 again. Sped up, looked down and was doing 90 again.) Anyway, you get the drift. My XB really likes to Cruise at 5000. Is that too much???

She means a lot to me and I want her to last a long time!
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Koz5150
Posted on Tuesday, June 15, 2004 - 11:53 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

If I could find a larger sprocket for the rear I would bolt it on in a minute. Just changing the front one from 27 to 26 teeth made my city driving so much smoother. I have thought about a chain conversion just to change the ratio.

Only downside from the 27 to 26 tooth change is that my speedo is off by 5 mph at 55. It reads 60.
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Bartimus
Posted on Wednesday, June 16, 2004 - 12:29 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

Be careful Charlie,
does she mean THIS much to you?

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99x1
Posted on Wednesday, June 16, 2004 - 06:49 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

IIRC, the O2 sensor on your X1 only is used between 2500-3500 RPM - at 4000 RPM the fuel injection map is what was stored the last time you cruised at 2500-3500. If you change altitude and never dropped below 3500, or refueled while running (?), the ECM wouldn't compensate. Due to this, I would guess they thought the engine would be cruised at <3500?
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Smoke
Posted on Wednesday, June 16, 2004 - 06:59 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

since the speedo reads off the front tire revolutions on the tubers, i dont see how a pulley change would change your speedo indication. adding a smaller pulley to the front will elevate rpm for any given gear and speed. most of the 6 speed xmsns i've seen dont change final drive much, if at all, but decrease gear spacing between the gears. they usually have better manufacturing quality and fit though. lugging the engine at low rpm is not a good thing. with stock gearing and a 180/55 tire on the rear my speed is slightly under 2X rpm. with 170/60 speed is 2X rpm. it no longer will pull to the limiter in 5th, so i haven't changed the gearing, but i am waiting for my parts to arrive for a freshen up. sorry for the long post.
tim
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Smoke
Posted on Wednesday, June 16, 2004 - 07:02 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

i didnt think about digital speedos.
sorry 97s1 under me.
tim
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Hans
Posted on Wednesday, June 16, 2004 - 07:11 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

Smoke: Some tubers do have a cable to their speedo, others have a sensor on the tranny: In that case you can take up an adjustable piece of electronics within the wire. Jerome ever wrote about such a thingie.
Hans
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Blackbelt
Posted on Wednesday, June 16, 2004 - 07:12 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

funny you mention a hardware store run 10 miles away bomer, it has happened to me... and where i work, there are "0" auto parts or hardware stores for almost 8-10 miles.
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Thunderbox
Posted on Wednesday, June 16, 2004 - 10:10 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

Engines are really designed to be run at 80% of there max RPM on a continuous basis. Lets see that means my Buell could be run at say 5500RPM all day long with no bad side effects and good reliability. I think that would be over 100mph, cops should like that. "officer I am just driving it at it's designed 80% rpm level. Your honor I was just lalalalllalallalallalall"
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Pilk
Posted on Tuesday, June 22, 2004 - 04:13 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

Yes it is over 100.... and I did that on my x-1 from MO to Dallas and back.... last month while home on R&R....no ill effects, used about 1/2 qt. of oil, no other issues..flawless ride....sore butt.

Pilk
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