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Thread: Slash 5 Flywheel removal

  1. #1
    Registered User kwb210's Avatar
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    Slash 5 Flywheel removal

    The bike: 1972 R75/5 about 55,000 miles, parked for many many years, getting a once over before moving to the category of "rider". I'm pulling the flywheel to inspect and replace the rear main seal as well as the oil pump O ring. Removed the 5 bolts in flywheel and she is stuck! I don't want to use a puller as that might push the crank forward, it is blocked but does not seem worth the risk. I thought of using a dead blow hammer attached to a bolt screwed into the wheel. So, I am looking for suggestions on the safe removal of the flywheel.
    Thanks!
    Kurt
    Attached Images Attached Images
    1977 R100/7 1971.1972.1972.1973 R75/5
    1974 R90/6 multiple boxes
    Airhead Revival
    "Objects in the mirror appear to be losing" unk

  2. #2
    #4869 DennisDarrow's Avatar
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    heat with a torch is a pretty standard method and then it pretty much pulls right off......The same thing for re-install........God bless......Dennis

  3. #3
    Rally Rat
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    Flywheel removal

    I use a piece of 1/4 in. bar stock that's long enough to cross the bell housing. Drill a couple holes opposite holes that hold on the clutch assembly, and use two of the clutch removal bolts to pull it off. Don't need heat, just patience.
    Boxerbruce

  4. #4
    Registered User kwb210's Avatar
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    Sucess!

    Used the combo of your statements to release the flywheel (with no damage to any surrounding parts or humans). Finally was able to use my 18mm Craftsman combination wrench, it has hung up for years and never got any action, living between the highly used 17mm and sometimes used 19mm, it was a forgotten wrench. Used the clutch removal bolts to hold the 18mm across the flywheel, then a bit of heat, not too much, and a dead blow hammer attached to the 18mm wrench, a couple of hard hits on the dead blow shaft and the flywheel pulled loose. Not much oil leakage. After 40 years I would expect the seal to be nearing the end of it's job of keeping oil on the inside! Any bike that has low miles typically has sat for extended periods and that allows the seal to dry out, that spells leak. The seal is not cheap, about $26 bucks, but why risk a mess on your clutch plate? I see these really nice looking bikes with low miles go for fairly high sums and note in the descriptions all the seller did was freshen up the fluids and gosh, it runs great! Just wait. While the job is a bit labor intensive, it is rewarding. Plus you have the chance to clean stuff up like the swingarm bearings.
    Next step is a lightened flywheel!
    Kurt
    Attached Images Attached Images
    1977 R100/7 1971.1972.1972.1973 R75/5
    1974 R90/6 multiple boxes
    Airhead Revival
    "Objects in the mirror appear to be losing" unk

  5. #5
    Registered User kwb210's Avatar
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    Lightened Flywheel

    I have a slash flywheel already machined and ready to install, I am also doing a 1974 R90/6 so I had the machine shop do the same on that wheel. They look pretty cool.
    Kurt
    Attached Images Attached Images
    1977 R100/7 1971.1972.1972.1973 R75/5
    1974 R90/6 multiple boxes
    Airhead Revival
    "Objects in the mirror appear to be losing" unk

  6. #6
    Registered User kwb210's Avatar
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    Cleaned her up a bit

    I was lucky that the grease was fairly light, a scotch brite pad and cleaning solution made fairly quite work of it. Seal came out and now I will sit and look for the Postman to come down the street with my new rear main seal, oil pump O ring, flywheel bolts and clutch cover allens. I order stuff from Hucky's and he is really quick about getting stuff out. So while I am waiting I will pull the seals from the swingarm and clean and re-grease the swingarm bearings then install new grease seals. Fun stuff!
    Attached Images Attached Images
    1977 R100/7 1971.1972.1972.1973 R75/5
    1974 R90/6 multiple boxes
    Airhead Revival
    "Objects in the mirror appear to be losing" unk

  7. #7
    Administrator 20774's Avatar
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    Quote Originally Posted by kwb210 View Post
    So while I am waiting I will pull the seals from the swingarm and clean and re-grease the swingarm bearings then install new grease seals.
    What seals are you referring to? On my /7, there's a plastic cover that pops off. Possibly on the earlier models there as a hex cap nut that just screws off. Using one of a variety of rubber coned devices (like for lubing chainsaws) you can put that in the center of the bearing and push grease through to the other side. Basically, the bad stuff gets in from the back side...by pushing that way, you just push the old grease out to the gap in the swingarm where it can be cleaned up. For a thorough cleaning, you must by the right tool to actually pull the bearings and races.
    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!

  8. #8
    Registered User kwb210's Avatar
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    Seal: outer seal to keep junk out

    Okay, not a very good description...I believe slash 5 from 1970 and bikes clear up to about 1985 used the same format. In a perfect world where the swingarm was greased/serviced on a regular basis you could just continue the regular service like you described. On bikes that sat around or were not greased on a regualr basis the grease gets hard. When you attempt to insert the grease tool to send in that shot of fresh grease the old stuff does not want to move. So I pul the swingarm seal, 31 41 2 000 331, which destroys it, and then pull the bearing out. The bearing is usually not worn much, clean it and fill it with wheel bearing grease, clean out the housing and re-insert the bearing into it's race. New swingarm seal and you are back in business! Here is a pic of what most of us would see when we started. I have removed the spacer at this point.
    Attached Images Attached Images
    1977 R100/7 1971.1972.1972.1973 R75/5
    1974 R90/6 multiple boxes
    Airhead Revival
    "Objects in the mirror appear to be losing" unk

  9. #9
    Registered User kwb210's Avatar
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    Cycleworks tool: swingarm bearing puller 1955-1984

    What a range of years the tool works in, wow. Sweet tool that does not damage the swingarm. The brass colored nut in the middle is pushed down and the Allen screws expand to grab hold of either the seal or the bearing race.
    Attached Images Attached Images
    1977 R100/7 1971.1972.1972.1973 R75/5
    1974 R90/6 multiple boxes
    Airhead Revival
    "Objects in the mirror appear to be losing" unk

  10. #10
    Registered User kwb210's Avatar
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    Tool in place

    tool is in place and ready to do it's job
    Attached Images Attached Images
    1977 R100/7 1971.1972.1972.1973 R75/5
    1974 R90/6 multiple boxes
    Airhead Revival
    "Objects in the mirror appear to be losing" unk

  11. #11
    Registered User kwb210's Avatar
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    another piece of the tool

    now it is ready
    Attached Images Attached Images
    1977 R100/7 1971.1972.1972.1973 R75/5
    1974 R90/6 multiple boxes
    Airhead Revival
    "Objects in the mirror appear to be losing" unk

  12. #12
    Registered User kwb210's Avatar
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    extraction

    extraction
    Attached Images Attached Images
    1977 R100/7 1971.1972.1972.1973 R75/5
    1974 R90/6 multiple boxes
    Airhead Revival
    "Objects in the mirror appear to be losing" unk

  13. #13
    Registered User kwb210's Avatar
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    seal is out, ruined but that's the way of life

    The seal is now out, destroyed but no damage to the swingarm or the bearing.
    Attached Images Attached Images
    1977 R100/7 1971.1972.1972.1973 R75/5
    1974 R90/6 multiple boxes
    Airhead Revival
    "Objects in the mirror appear to be losing" unk

  14. #14
    Registered User kwb210's Avatar
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    Bearing unharmed

    The bearing is out and can be cleaned. Roll it around in the race and make sure there is no resistance.
    Attached Images Attached Images
    1977 R100/7 1971.1972.1972.1973 R75/5
    1974 R90/6 multiple boxes
    Airhead Revival
    "Objects in the mirror appear to be losing" unk

  15. #15
    Registered User kwb210's Avatar
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    Clean out the housing

    Clean out the old grease from the housing. Add new slightly less smelly grease to the housing and add the newly greased used bearing to it's race, try and keep the right side on the right side and the left side, well, you get it. Now the swingarm is set for another life as long as you service it. New grease and the bearing is set to do it's job no matter what the load...
    Attached Images Attached Images
    1977 R100/7 1971.1972.1972.1973 R75/5
    1974 R90/6 multiple boxes
    Airhead Revival
    "Objects in the mirror appear to be losing" unk

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