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Thread: Loss of power 100s

  1. #1
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    Loss of power 100s

    Lost power on hwy at first it was just a slight intermittent power loss.
    Then it would go away almost like water in gas, checked float bowls did not see any water.
    Had been riding in rain for two days?

    If any one has any ideas, was low on oil but not out of oil & had just added oil when this started.

    Was heading north on 81 in Virginia when this happened.
    Presently bike runs but not like it should be.

    Craig

  2. #2
    Das Drogenhandler troyboy's Avatar
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    Check the coils,plug wires n plug caps. Recently,my R100/7 acted like water in fuel on way home from work. Turns out,my right plug cap was bad.

  3. #3
    Registered User dmftoy1's Avatar
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    Reply just spoke with Craig and got him some #'s from the anonymous book. Here's some info he gave me that may or may not help.

    Started after a fuel stop (new bike to him, just bought it today and riding it home)

    Earlier today they discovered the locking gas cap was locked a there is no key so they had to drill the cap to get it open.

  4. #4
    Registered User lkchris's Avatar
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    Check that your tankbag is not sealing so tightly against the top of your tank that the fuel cap can't vent.
    Kent Christensen
    21482
    '12 R1200RT, '02 R1100S, '84 R80G/S

  5. #5
    James.A
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    If the trouble started right after a fuel stop, that would shout "bad gasoline" in my ears.

  6. #6
    Registered User dmftoy1's Avatar
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    Was hoping we'd hear he was alive and well by now

  7. #7
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    Torn carb diaphragm?

    some more info would be helpful. Low, mid or high speed power loss? Or all the above. Won't accelerate as should, or won't hold speed as should?
    Ride Safe, Ride Lots

  8. #8
    Minnesota Nice! braddog's Avatar
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    Quote Originally Posted by James.A View Post
    If the trouble started right after a fuel stop, that would shout "bad gasoline" in my ears.
    That's what I was thinking as well. That, or something that happened with the venting after the stop.
    -----------------------------------------
    Brad D. - Member #105766
    '77 R100RS - Black Beauty (big pipe, baby!)
    '94 R1100RS - Sylvia

  9. #9
    Registered User lkchris's Avatar
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    Right after a fuel stop, you put your tankbag back on.
    Kent Christensen
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    '12 R1200RT, '02 R1100S, '84 R80G/S

  10. #10
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    Quote Originally Posted by lkchris View Post
    Right after a fuel stop, you put your tankbag back on.
    umm, doesn't the tank vent thru the gas gap lip area to underneath the tank, not above it?
    Ride Safe, Ride Lots

  11. #11
    Administrator 20774's Avatar
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    Quote Originally Posted by bikerfish1100 View Post
    umm, doesn't the tank vent thru the gas gap lip area to underneath the tank, not above it?
    No, it vents right through the cap. You might be thinking of the overflow drain. If you get too much fuel or water gets around the cap, there is a hole and a drain line to the bottom of the bike. The hole at the top of the cap is actually connected to the bottom of the tank via an enclosed pipe through the tank.

    BTW...I don't see where the OP mentioned anything about a tank bag. Maybe it's an assumption if he's on the road.
    Kurt -- Forum Administrator ---> Resources and Links Thread <---
    '78 R100/7 & '69 R69S & '52 R25/2
    mine-ineye-deatheah-pielayah-jooa-kalayus. oolah-minane-hay-meeriah-kal-oyus-algay-a-thaykin', buddy!

  12. #12
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    Quote Originally Posted by 20774 View Post
    No, it vents right through the cap. You might be thinking of the overflow drain. If you get too much fuel or water gets around the cap, there is a hole and a drain line to the bottom of the bike. The hole at the top of the cap is actually connected to the bottom of the tank via an enclosed pipe through the tank.

    BTW...I don't see where the OP mentioned anything about a tank bag. Maybe it's an assumption if he's on the road.
    thx. haven't looked at my airhead's tank in a while. it's in "project" status.
    Ride Safe, Ride Lots

  13. #13
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    Broken

    Quote Originally Posted by bikerfish1100 View Post
    Torn carb diaphragm?

    some more info would be helpful. Low, mid or high speed power loss? Or all the above. Won't accelerate as should, or won't hold speed as should?
    Spent the day yesterday draining fuel, changing plugs.
    Did not get to try bike with different plugs wires yesterday before trials started on point!
    And that took a while to adjust point decided parts were needed.
    So awaiting to hear back from Salem BMW.
    I am hoping gambling on plug wire as changed plugs no change.

    After a gas stop there was an intermittent loss of power, initially just a blip I could feel it would go away.
    Then return 5 10 minutes later eventually the interval became continous.
    Lost idle & top end power still could drive bike well sorta.
    Shop says one side is not heating up. Plug wire maybe.
    With luck.

    Was Ottawa wifi range yesterday.

    No tank bag the drain hole appeared to work, added fuel cleaner for water no change.

  14. #14
    Administrator 20774's Avatar
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    Poor idle performance suggests valve clearances has closed up.
    Kurt -- Forum Administrator ---> Resources and Links Thread <---
    '78 R100/7 & '69 R69S & '52 R25/2
    mine-ineye-deatheah-pielayah-jooa-kalayus. oolah-minane-hay-meeriah-kal-oyus-algay-a-thaykin', buddy!

  15. #15
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    I didn't get, but are you still running points and condenser or electronic.

    What you are describing sound eerily similar (if I remember that far back) to what my /2 did. Turned out to be condenser.

    It would work fine till it got warm, and then completely quit when hot.

    took me a while to figure out.

    I wonder about valve settings as was mentioned, my /2 also would run fine until it got really warm (very warm/hot weather) and a lot of city stopping from red lights, etc) and it would run rough and be extremely hard starting. Turned out to be valves. I added a .001 or .002 to gap, and solved the problem completely!

    Other than the junk Bing carbs, that engine ran like an electric motor after that.

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