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Bottom end rebuild? Advice needed

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  • Adam76
    Adam76
    3 years ago
    Quoting milo1 on 11 Apr 2021 07:15 AM

    My advice you need to plan. $ how much can you stretch too. Are you doing the work that will halve the price. Or some of the work pro rata. Leak back tests, compression tests. Oil pressure. these will determine a lot. If the head comes off then crank can be assessed. With bigger bores and cams etc you should be able to get a lot of power out of your bike. As said you can get near 100cube boring out your 88. I f you want a square motor you are as close to 4 x4 as you can get!

    My two bobs worth if it runs get the above tested if good then save your pennies and ride. If it needs a top end then get a decent rebore piston etc head tidy, cam and you will be having fun for years. My friend got his 88 - 95 with cam etc for $3K.
    As said crank can be assessed when barrels come off.
    If crank is in need of rebuild, harley cranks can go huge mileage if oil is kept up to the knocker, then you have an big decision. Getting the crank rebuilt you wouldn't bother you would get a longer stroke one get it balanced, welded and trued. You would also get it bored out maybe 114 this size will still give longevity. Why would you not get a timken. Gear cams and upgraded oil pump. Oh yeah oil cooler. Clutch. That 111 s and s is not that dear with warranty!
    Last word dont fixate on the crank, if it is f---- then rest of bike might be too.
    Remember there are other crate motors and yes s and s is one of the best. Ultima can offer a good alternative yeah everyone knocks them. Only have a limited experience with them but has been favourable.

    Thanks Milo, yes it definitely needs a top end and cams. 

    My pockets are not deep, which is why I'm working on a 2002 fatboy in the first place. I'm yet to pull the top end down, so I will assess as I go...

    Definitely no $$$ for a crate motor. I'll be doing most of the labor myself and besides the bike itself isn't in show room condition and doesn't warrant a brand new expensive crate motor. 

    Cheers. 
  • Adam76
    Adam76
    3 years ago
    Quoting Krash Kinkade on 11 Apr 2021 11:13 AMedited: 11 Apr 2021 11:14 AM

    I  like the 88" stroke with barrels bored to 95" , they rev smooth. but depends what your planing to use the bike for?

    The bike is just being built as a reliable, strong performer, weekend cruiser. 

    I was just weighing up my options if indeed my crank was in need of repair or replacement. 
    Cheers
  • Krash Kinkade
    Krash Kinkade
    3 years ago
    Quoting milo1 on 11 Apr 2021 07:15 AM

    My advice you need to plan. $ how much can you stretch too. Are you doing the work that will halve the price. Or some of the work pro rata. Leak back tests, compression tests. Oil pressure. these will determine a lot. If the head comes off then crank can be assessed. With bigger bores and cams etc you should be able to get a lot of power out of your bike. As said you can get near 100cube boring out your 88. I f you want a square motor you are as close to 4 x4 as you can get!

    My two bobs worth if it runs get the above tested if good then save your pennies and ride. If it needs a top end then get a decent rebore piston etc head tidy, cam and you will be having fun for years. My friend got his 88 - 95 with cam etc for $3K.
    As said crank can be assessed when barrels come off.
    If crank is in need of rebuild, harley cranks can go huge mileage if oil is kept up to the knocker, then you have an big decision. Getting the crank rebuilt you wouldn't bother you would get a longer stroke one get it balanced, welded and trued. You would also get it bored out maybe 114 this size will still give longevity. Why would you not get a timken. Gear cams and upgraded oil pump. Oh yeah oil cooler. Clutch. That 111 s and s is not that dear with warranty!
    Last word dont fixate on the crank, if it is f---- then rest of bike might be too.
    Remember there are other crate motors and yes s and s is one of the best. Ultima can offer a good alternative yeah everyone knocks them. Only have a limited experience with them but has been favourable.

    Quoting Adam76 on 14 Apr 2021 05:11 AM

    Thanks Milo, yes it definitely needs a top end and cams. 


    My pockets are not deep, which is why I'm working on a 2002 fatboy in the first place. I'm yet to pull the top end down, so I will assess as I go...

    Definitely no $$$ for a crate motor. I'll be doing most of the labor myself and besides the bike itself isn't in show room condition and doesn't warrant a brand new expensive crate motor. 

    Cheers. 

    if your doing all the work, you won't be able to rebuild the flywheels, only person I know in Australia that can work on bottom end of twin cam, is Ollie up Queensland, but not sure if he has replacement crank pin and roller bearings and rods. the old Evo & shovel , Pan & early flywheels rebuildable.
  • Adam76
    Adam76
    3 years ago
    Thanks Krash, appreciate the info on the QLD guy for the flywheels. 
    TBH I'm hoping I don't have to, if my runout is good I'm just going to build a strong 95" and blue print the top end. 

    I just got quoted $250 just to drill and tap my heads to put in manual compression releases, and that's not including the $125 for the parts.... if I had of known I probably would have paid the extra $100  when choosing my cams and gone with S&S easy start cams. 😁

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