New Owners - Stupid Questions Thread

[HappyHighwayman]

WHat is the crank of the F800GS's cylinders?

[epicxcrider]

Originally Posted by toolbox77

Stupid new owner question: what temp do other F800s run at? I'm steady at 4 bars and was just wondering if that's normal. Thanks!

Always at the bottom line - what kind of conditions are you riding in? Much mud? Might gently wash the rad with a hose - being cautious not to bend fins.

[epicxcrider]

Originally Posted by seaswood

Repalcing tires, Pirelli Scorpion for Anakees.
Manual mentions not to remove grease from axle?
Is there a reccomended grease for axle?
Can one use wheel bearing grease to coat axle with.
The front did seem quite grayish?
Or is it best to do as they say just not remove grease from axle?
I read most of this thread did not see mention.
Tire threads too long to reread.

That Pirelli really did not want to leave that rear wheel.

I used never seize

[itsatdm]

Originally Posted by HappyHighwayman

WHat is the crank of the F800GS's cylinders?

Not sure what the question is. Crank is usually means crankshaft, the thingy the pistons connect to via connecting rods. If referring to the direction it turns, counter clockwise. If you mean type, it is referred to as a 360 degree type. On most vertical twins, it means both pistons rise and fall at the same time, but only 1 is on the power stroke. The engine has 1 power stroke on every 360 degrees of crank rotation.

If this question is referring to the change Husqvarna made to this engine, I posted. They changed the crank throws, so instead of 1 power stroke every 360 degrees of crank rotation, the power stroke occurs at 315 and 405 degrees. I hope your answer is in there somewhere.

[JGoody]

Originally Posted by itsatdm

If this question is referring to the change Husqvarna made to this engine, I posted. They changed the crank throws, so instead of 1 power stroke every 360 degrees of crank rotation, the power stroke occurs at 315 and 405 degrees. I hope your answer is in there somewhere.

Not to hijack but I can understand the 360 degree crank choice in engine design -- the firing cycle is even -- for a vertical twin that would seem the smoothest choice. Why would Triumph use a 270 degree for the Scrambler (The Bonnie is 360) or Husky use 315,405?

[itsatdm]

Because it sounds cool. The theory behind it, is the further the power strokes are apart, the less wheel spin or at least the better the rider can control wheel spin.

Must be some merit to it, as Yamaha introduced it in their 4 cyl. GP bikes in 2005 and HD still wins races on National dirt ovals with an antique engine.

The new Yamaha Tenere 1200 uses it on their current twin and have been using it on the TDM for years.

There are limits. In the 1920's some vertical twins ran 180 degree cranks. I piston up and the other down. Results in a firing order of 180-540. It also induces side to side vibrations so bad, it would shake the bike apart.

V twins all have it. What the firing order will be depends depends on what angle the cylinders are to one another. Ktm's 950 cylinders are 75 degrees apart and the crank rotation is 285-435 degrees.

If you own a 800xc with 240/240/240 crank, it is all BS.

[HappyHighwayman]

Originally Posted by itsatdm

Not sure what the question is. Crank is usually means crankshaft, the thingy the pistons connect to via connecting rods. If referring to the direction it turns, counter clockwise. If you mean type, it is referred to as a 360 degree type. On most vertical twins, it means both pistons rise and fall at the same time, but only 1 is on the power stroke. The engine has 1 power stroke on every 360 degrees of crank rotation.

If this question is referring to the change Husqvarna made to this engine, I posted. They changed the crank throws, so instead of 1 power stroke every 360 degrees of crank rotation, the power stroke occurs at 315 and 405 degrees. I hope your answer is in there somewhere.

I apologize for the ignorant way I phrased the question, what I was looking for (and you answered) was the "type" i.e. 360 degree. What does it mean that "only one is on the power stroke"?

[toolbox77]

Originally Posted by epicxcrider

Always at the bottom line - what kind of conditions are you riding in? Much mud? Might gently wash the rad with a hose - being cautious not to bend fins.

Paved and dirt roads mostly, but it's been running at 4 bars since the day it left the dealer. Is that more or less than where anyone else is?

[WoodWorks]

Originally Posted by toolbox77

Paved and dirt roads mostly, but it's been running at 4 bars since the day it left the dealer. Is that more or less than where anyone else is?

Yes, that's where it should be under normal conditions. Mine occasionally shows only three bars when I'm riding in very cold weather. But after 42,000 miles I can probably count those instances on one hand. Four bars is normal.

[toolbox77]

Originally Posted by WoodWorks

Yes, that's where it should be under normal conditions. Mine occasionally shows only three bars when I'm riding in very cold weather. But after 42,000 miles I can probably count those instances on one hand. Four bars is normal.

Cool, thanks!

[itsatdm]

Originally Posted by HappyHighwayman

I apologize for the ignorant way I phrased the question, what I was looking for (and you answered) was the "type" i.e. 360 degree. What does it mean that "only one is on the power stroke"?

It takes two rotations of the crankshaft (720 degrees) to go through all 4 cycles of a 4 stroke motor(Intake,compression,power,exhaust). When 1 piston is in the Compression stroke(TDC) , the other is finishing the exhaust stroke. The only other option for a vertical twin and still be called a 360 would be if both were on the compression stroke. A Twingle. The same as a single cylinder engine only in duplicate.

It is the position the pistons are in relation to the bore that makes the determination of a 360 engine. The opposed piston BMW is a 360, because both pistons are at TDC at the same time, they too are on different strokes.

[JRWooden]

Originally Posted by toolbox77

Stupid new owner question: what temp do other F800s run at? I'm steady at 4 bars and was just wondering if that's normal. Thanks!

4-bars is the standard ... I never see a 5th bar unless something is FUBAR

[grndzr0]

The dipstick on my wifes 650 twin has warped badly, has this happened to anybody?


I noticed it a while ago, but it has slowly gotten worse...

Ryan

[JRWooden]

Originally Posted by grndzr0

The dipstick on my wifes 650 twin has warped badly, has this happened to anybody?


I noticed it a while ago, but it has slowly gotten worse...

Ryan

Very weird.................
I've been tracking the "twins" for about 4 years now and yours is the first I've hear of...........

[grndzr0]

Originally Posted by JRWooden

Very weird.................
I've been tracking the "twins" for about 4 years now and yours is the first I've hear of...........

This is after I tried to straighten it... It was quite a bit worse