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Old 11-27-2013, 10:37 AM   #16
Tweaker
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I put over 100,000 miles on my K100 and except for the filter, never touched the fuel injection system.
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Old 11-27-2013, 10:39 AM   #17
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Originally Posted by Tweaker View Post
I am not sure how anybody can claim carbs are easier to work on.

and I never understand anybody claiming they need to 'work' on carbs. I've never NEEDED to work on any carb, open an intake or add an exhaust sure, I've worked on a carb for that reason. Never because it broke. Never had a problem draining a bank of four for the winter, just leave the tank on and drain it too.

FI sure, had to work on those...fuel pumps croak, injectors get clogged.
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Old 11-27-2013, 10:42 AM   #18
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Originally Posted by Tweaker View Post
I put over 100,000 miles on my K100 and except for the filter, never touched the fuel injection system.

You got 100,000 out of a speed density system on a K bike? You are a god.


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Old 11-27-2013, 10:45 AM   #19
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fuel injection for sure

but an FCR carb will make me ponder for a few moments....

then shake it off and get FI
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Old 11-27-2013, 10:52 AM   #20
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Originally Posted by larryboy View Post
You got 100,000 out of a speed density system on a K bike? You are a god.


I don't know what speed density system is. I replaced the fuel pump somewhere around 115k (Ford Mustang pumps fit), but that was from trying to push fuel through a dirty filter. As far as I'm aware, that is not unusual mileage for that system.
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Old 11-27-2013, 10:54 AM   #21
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Originally Posted by ragtoplvr View Post
FI hands down.

One of the major factors in the long life of most car and bike engines is precise metering of fuel in cold starts. Carbs are usually pretty rich and unless the rider/driver has good control over the enrichment here is excess gas washing oil off the cylinders causing wear.

Rod
On the subject of cold starts; A carb uses an enriching devise. It's called a choke for a reason because it restricts the air flow. It "enrichens" by restricting air.
Fuel injection, on the other hand, doesn't restrict the air. It just squirts more fuel. Many times I've fixed (after finding nothing wrong) a car coming in on the hook by simply sticking an air nozzle up the intake & cranking it. When talking to the customer about what had happened, I find out that the car had not run for very long each time it was started. Back it out of the driveway, wash it, run it back in, back it out, wax it, run it back in. Eventually the engine gets flooded from all the fuel being squirted by the injectors. So I'd say that F/I engines are plenty capable of washing the cylinders with fuel.

To the O.P.
You're right; six of one, half dozen of the other. F/I would be a bitch for you to fix, but may not need it. Carbs don't require the electronics of F/I, & are much cheaper to fix. For this reason I would prefer carbs for a 'round the world journey.
Six of one...
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Old 11-27-2013, 10:59 AM   #22
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Originally Posted by Tweaker View Post
I don't know what speed density system is. I replaced the fuel pump somewhere around 115k (Ford Mustang pumps fit), but that was from trying to push fuel through a dirty filter. As far as I'm aware, that is not unusual mileage for that system.

They use a trap door to measure air speed, they usually gum up to the point of not moving, then the bike won't do much more than idle.

I got 330,000 miles out of a set of carbs, damn engine wore out before the bank of four carbs.
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Old 11-27-2013, 11:14 AM   #23
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Originally Posted by larryboy View Post
They use a trap door to measure air speed, they usually gum up to the point of not moving, then the bike won't do much more than idle.
In all the years I was on the K bike board, I never heard of that.

So here is a question with our shit gas. Which is easier to repair a common problem - gumming.

One look at my YZF with it's bank of 6 little carbs is enough to scare hell out of me. Each one will contain dozens of little bitty parts - all of supreme importance. One shaft wears out and get set. MY MZ thumper has 2 carbs which nearly require frame cutting to remove. OTOH, I can value the simplicity of an XL100.
The fuel injection systems I know (BMW) are incredibly easy. Injectors, a fuel pump, the computer and electricity. Individual injector checking is 2 easy bolts.
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Old 11-27-2013, 11:20 AM   #24
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Originally Posted by larryboy View Post
They use a trap door to measure air speed, they usually gum up to the point of not moving, then the bike won't do much more than idle.

I got 330,000 miles out of a set of carbs, damn engine wore out before the bank of four carbs.
I'm quite sure it's called Bosch L-jetronic.
Odd. I've had several cars with that system and also K100 having that system. None had any "trap doors" sticking. The K100 went 130,000 miles and it's still being used by the next owner.
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Old 11-27-2013, 11:47 AM   #25
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Originally Posted by Tweaker View Post
So here is a question with our shit gas. Which is easier to repair a common problem - gumming.
If you're running carbs, the worst thing you can do is leave them sitting for extended periods(winter) with fuel in them. If you're laying the bike up for winter let it run till the carbs run out of fuel "especially if you're running government gas (E10). To prevent having to deal with cleaning gunked up fuel systems be it carb or FI run a fuel system cleaner in the fuel on a regular schedule. I'm a fan of Seafoam and in everything be it carb, FI, bike, car or truck I run a tank of Seafoam treated fuel though it at least yearly preferably every 6 months but yearly seems to be fine at least here. Seafoam or other cleaners will not rebuild/fix a neglected gunked up system but will keep it clean so you don't have to spend down time cleaning gummed up parts. Pouring $5-$10 into your fuel tank once or twice a year is a stupid easy maint thing "not a repair". I'm not into magic wrenches in a can fixes but regular addition of a fuel system cleaner does work in helping prevent down time from neglect. Keep it clean in the first place and you won't have take stuff apart to clean it.
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Old 11-27-2013, 11:47 AM   #26
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Originally Posted by trc.rhubarb View Post
Are you going to ride it every day?
Carbs don't like sitting with fuel in their bowls.
I can let a FI vehicle sit for months and it will fire up right away.

New Mexico isn't really remote if that's still your plan..
I may ride every day, or close to it. The place where I have to go to get mail is about 5 miles away.

You are correct, from a global perspective my 40 acres is not remote, but it is 40 miles to the nearest gas station, and almost 150 to the nearest town that is large enough to support a few MC dealerships. That is one of the reasons I hope to become at least reasonably proficient at maintaining my ride, however...

Quote:
Originally Posted by trc.rhubarb View Post
What I read into the OP's question is - "I don't want to do much maintenance or repair work, I don't really know how and I just want to ride." That said, something dead reliable and not race tuned sounds perfect. That to me would be Honda or another Japanese bike, or modern Harley/Victory.
Haha, makes me sound a little lame, but it is fairly accurate. Once I understand how something works, I don't mind tinkering, but I don't want to get too carried away either.

Sounds like fuel injection may be the best route for me to go. I will be living at 7000 feet, and plan trips both up and down in elevation. Also morning temps in the winter are pretty cold.

Maybe I will inherit and can ultimately have TWO motorcycles
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Old 11-27-2013, 01:28 PM   #27
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If I were gonna keep and use a bike for the next 20 years, I'd quickly rule out every carb bike made, next on that list would be anything chain driven.
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Old 11-27-2013, 03:23 PM   #28
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Originally Posted by larryboy View Post
You got 100,000 out of a speed density system on a K bike? You are a god.


Um, it's mass air, not speed density. It uses a flapper door airflow sensor. Speed density calculates airflow using rpm and air temp/pressure.
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Old 11-27-2013, 03:37 PM   #29
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Um, it's mass air, not speed density. It uses a flapper door airflow sensor. Speed density calculates airflow using rpm and air temp/pressure.
Ok, it was still stuck.
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Old 11-27-2013, 03:47 PM   #30
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Originally Posted by Tweaker View Post
I put over 100,000 miles on my K100 and except for the filter, never touched the fuel injection system.
My 1988 K75 is still on its original fuel pump! Fingers crossed.
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