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V4's FTW
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10,494 Posts
Discussion Starter #1
I've always wanted to build a slingshot... now I get to build 2!!

This one is a 1990 750. When I got it, it had already had 07 gixxer front and rear ends grafted on. The front looks legit and the rear is not bad, but incomplete.

Once I get the chain line straight and the rear wheel centered, I'll move on to fitting an R6 tail and an MT03 headlight.

The motor is going to be mostly stock, I'm adding k&n pods and a sidewinder header. Can tbd.

Also adding some modern controls, lots of braided hoses with fancy fittings, Koso speedo, and a paint job.

While I'm taking breaks from all of that, I'll be scrubbing the frame and swingarm with Scotch Brite to give them a nice satin brushed finish.

This is how I got it:


Paper proof of start date:




Sprockets a bit off



More tomorrow...
 

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V4's FTW
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10,494 Posts
Discussion Starter #6
In order to straighten out the rear end, I started by getting the sprockets in line. To do that, I had to flush up the inside right frame rail.





Nicey nice



Chain is now straight



Time to find out where the wheel is



Nothing a 3/8" offset sprocket can't fix



Probably going to use this one

 

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V4's FTW
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10,494 Posts
Discussion Starter #8
PBI 3/8" offset 15t front sprocket ordered today, as well as a 45t steel Vortex rear.

Turned up an AL spacer to fit where the link for the 07 swingarm used to. Tuned the length of the adjustable links.

Next step is to cut the right side swingarm spacer, but need the rear sprocket first.

Then jack the ride height up to where it should be, then it can come off the lift and start fitting the subframe.
 

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Administrator
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50,498 Posts
Re: Sebspeed's 750 Slingshot discussion

LOL probly pretty close fer sure ;)
 

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V4's FTW
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10,494 Posts
Discussion Starter #10
Only got a little in on this today, was in the paint booth working on CB900 case covers.

Got back and turned up the right side swingarm spacer.



While I was hunched over the lathe I cleaned up a spare 22mm socket to prep for milling teeth later, will be the tool to tighten the swingarm nut.



Sprockets arrived, fitted front



Need to trim the inside of the left frame rail to fit the arm, then mark out the frame for trim to fit chain run top and bottom.

Rear sprocket will be flipped so the relieved side fits against the wheel, this brings the chain .140" closer to the wheel/tire.

 

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Premium Member
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530 Posts
Re: Sebspeed's 750 Slingshot discussion

love everything your doing, and if your past work is any indication of these new build being great, then I'm sure they will be schweeet.
 

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V four honda whore
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12,400 Posts
Re: Sebspeed's 750 Slingshot discussion

Will you extend the seat foam part ot cut down the subframe?
 

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V four honda whore
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12,400 Posts
Re: Sebspeed's 750 Slingshot discussion

you still can, just make new bolt holes :)
 

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Registered
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956 Posts
Re: Sebspeed's 750 Slingshot discussion

you still can, just make new bolt holes :)
best answer ever!
agreed though the seat unit looks great and 4" shorter will look even greaterererer
 

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V4's FTW
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10,494 Posts
Discussion Starter #18
Finally got some hours in today. Removed 3" total from the subframe. 2" wasn't enough*.



Will make for a nice transition line in the bodywork









Makes seat work easier



Template for mounts



Looks good, transfer to aluminum



Fleshed out





That's a sexy mount!










* that's what Yan said :oops:
 

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V4's FTW
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10,494 Posts
Discussion Starter #19
In order to weld them on, I needed to figure out a way to hold each mount at the same height. I prefer fixturing vs working off dimensions and scribe lines. Fixturing always seems to turn out better.

Easiest thing to go off of was the rear set mount hole... but I didn't want to waste time cutting and drilling a temporary structure... the closest handy item did the trick



All I had to do was cut a taper in a bolt head to center it up, and add a piece of drop to the jaws to set the height.







Worked out well









Top mounts next
 
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