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Thread: Anyone ever own a 1976 Honda MR 175??

  1. 05-31-2003, 11:23 PM #1
    Yamaha_Rules69's Avatar
    Yamaha_Rules69
    Yamaha_Rules69 is offline Power User Roostin Away
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    Anyone ever own a 1976 Honda MR 175??

    I own a 1976 Honda MR 175 oldschool motocross bike, bought it for $25 a few years ago! What a steal!! It was a good bike WHEN it ran. It has new coils in it, new points, and has great blue spark. The only problem with it is the flywheel. Every time it gets fixed, the same thing happens. The little sodder key that holds the flywheel in place always manages to come loose somehow, or something happens, causing the keyway in the flywheel to crack. It has done this 3 times now, once to the original, and two times to a diffrent flywheel we bought. We had it welded, thinking it was going to work, and it happened again. Anyone else ever own one of these bikes? Does anyone have a solution that may solve this problem? Let me know. Thanx.
    THE 80's RAGE! Currently owns:
    81, 85 Yamaha Tri Moto 125
    83 Yamaha Tri Moto 200 x2
    82,83 Yamaha Tri Moto 175 project
    85 Yamaha Tri Z 250
    84 Kawasaki Tecate 250
    84 Honda ATC 70
    85 Honda ATC 350X
    84 Honda ATC 250R
    (2) 84 Honda ATC 200x
    82, 83 Honda ATC 185s
    81 ATC 200
    Lots of other parts and bikes
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  2. 06-02-2003, 01:13 AM #2
    Kilborg
    Kilborg is offline Super Moderator Just too addicted
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    You should not be shearing keys like that. Properly mount the flywheel, and torque it to spec
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  3. 06-12-2003, 10:44 PM #3
    Honda300ex's Avatar
    Honda300ex
    Honda300ex is offline Got The Holeshot Arm chair racerJust too addicted
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    We have 2 76 Mt250s One my dad bought new and we are rebuildin the motor right now, Then we have another that we got in a trade and the guy gave us a side cover for a 125.. Need it?
    06 TRX450r , 85 ATC250r, 01 TRX300ex, 84 ATC110
    88 Mustang GT
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  4. 06-12-2003, 10:46 PM #4
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    Honda300ex
    Honda300ex is offline Got The Holeshot Arm chair racerJust too addicted
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    The one my dad bought new does the same thing as urs.. we are tearing it down and puting a new crank in it
    06 TRX450r , 85 ATC250r, 01 TRX300ex, 84 ATC110
    88 Mustang GT
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  5. 06-13-2003, 10:57 AM #5
    Yamaha_Rules69's Avatar
    Yamaha_Rules69
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    do you know if the 125 side cover will fit a 175? I dont know if i want to stick any more money into this thing..
    THE 80's RAGE! Currently owns:
    81, 85 Yamaha Tri Moto 125
    83 Yamaha Tri Moto 200 x2
    82,83 Yamaha Tri Moto 175 project
    85 Yamaha Tri Z 250
    84 Kawasaki Tecate 250
    84 Honda ATC 70
    85 Honda ATC 350X
    84 Honda ATC 250R
    (2) 84 Honda ATC 200x
    82, 83 Honda ATC 185s
    81 ATC 200
    Lots of other parts and bikes
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  6. 06-13-2003, 10:59 AM #6
    Honda300ex's Avatar
    Honda300ex
    Honda300ex is offline Got The Holeshot Arm chair racerJust too addicted
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    woops.. i thought you had a 125.. I could get some pics if you wanted. In a few days my camera should be in
    06 TRX450r , 85 ATC250r, 01 TRX300ex, 84 ATC110
    88 Mustang GT
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  7. 06-13-2003, 11:21 AM #7
    TimSr's Avatar
    TimSr
    TimSr is offline Banned The day begins with 3WW
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    I had a similar problem with my TriZ shearing off keys. Last time, I put a bunch of Loctite on the flywheel where it contacts the crank, and torqued it down with the air impact, and havent had a problem yet. However after I did my "fix" somebody posted baout how they used valve lapping compound on the flywheel and shaft, and when you got finished you had such good surface contact, that they didnt even use the woodruff key. Id stilkl use the key, but his fix makes sense to me.
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