Hello I have a 1998 Honda shadow ace 750 that I’m building into a hooligan flat track bike I’m wanting to swap the front end with a Harley sportster 49 mm set up that I have in the garage. Has anybody done anything like this? I believe the Harley uses a 1 inch steering stem I’m not sure what the dimensions are for the bearings and steering stem of the Honda any help on the swap would be appreciated
Beefy
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5,556 Posts
Why?
Measure again.
Any modern Sportster forks I've seen are Showa 39mm or thereabouts, H-D forks are quoted as mm., but are actually machined as inches.
I've seen a project that cut the stock head tube short and inserted and welded a machined tube tube with Harley bearing cups in to take an aftermarket springer front end, but that was a lot of work. I can't lay my hands to a link to it.
I don't know if this will help: Fork conversion | All Balls Racing
Under the covers the 750 ACE has Showa forks with 41mm tubes.
Like so:
![294774]( "294774")
Measure again.
Any modern Sportster forks I've seen are Showa 39mm or thereabouts, H-D forks are quoted as mm., but are actually machined as inches.
I've seen a project that cut the stock head tube short and inserted and welded a machined tube tube with Harley bearing cups in to take an aftermarket springer front end, but that was a lot of work. I can't lay my hands to a link to it.
I don't know if this will help: Fork conversion | All Balls Racing
Under the covers the 750 ACE has Showa forks with 41mm tubes.
Like so:
Joined
·
5,556 Posts
No that is another one, same idea though and the one I remember thanked mavrick for inspiration.
1" steerer like my old mountain bike, hey that gives me an idea. (-;
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5,556 Posts
An interesting project, I initially thought it was a street mod of some kind.
If you keep the stock fork Racetech can make it behave, for dollars of course. RT - Digital Product Search
The engine can be made a little more powerful fairly cheaply, mix and match of mostly Honda parts, you will need a different ICM I recommend the Ignitech TCIP4.
With a change to the NT650 valve springs and cams, on the street I reliably...so far, spin the stock bottom end and pistons to 7500 rpm, I have the limiter set to 8000, it is willing to keep pulling, but the stock limit is 6100 on the ACE, so bear that in mind. NT650 aftermarket cams and valve train will fit, pistons will not.
If you blow it up you are better to grab another engine from the wreckers than try to fix it (It is a selective assembly bottom end}, 1998 to 2003 ACE and 2001 to 2007 Spirit (chain drive) will bolt right in and are plentiful, just swap the good stuff over.
PB Sprockets has a 16 tooth front sprocket with the stock offset (Stock is 17), front sprockets for the 750 Africa Twin are available to 15 teeth, fits the spline, but the offset is different.
Rear sprocket is available to 47 teeth.
I think with the heavy crank and flywheel, it just might put down good usable power on the dirt.
Please keep us updated on the project, a few folks here will be interested.
If you keep the stock fork Racetech can make it behave, for dollars of course. RT - Digital Product Search
The engine can be made a little more powerful fairly cheaply, mix and match of mostly Honda parts, you will need a different ICM I recommend the Ignitech TCIP4.
With a change to the NT650 valve springs and cams, on the street I reliably...so far, spin the stock bottom end and pistons to 7500 rpm, I have the limiter set to 8000, it is willing to keep pulling, but the stock limit is 6100 on the ACE, so bear that in mind. NT650 aftermarket cams and valve train will fit, pistons will not.
If you blow it up you are better to grab another engine from the wreckers than try to fix it (It is a selective assembly bottom end}, 1998 to 2003 ACE and 2001 to 2007 Spirit (chain drive) will bolt right in and are plentiful, just swap the good stuff over.
PB Sprockets has a 16 tooth front sprocket with the stock offset (Stock is 17), front sprockets for the 750 Africa Twin are available to 15 teeth, fits the spline, but the offset is different.
Rear sprocket is available to 47 teeth.
I think with the heavy crank and flywheel, it just might put down good usable power on the dirt.
Please keep us updated on the project, a few folks here will be interested.
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