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Old 01-04-2010, 01:12 PM   #1
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Hayabusa Motor Swap

I have an '05 Busa w/ only about 30K on it (was out o' commission for awhile).

It has a broken "shift fork" - skips out of 2nd gear under any acceleration.

I'd like to buy a second bike for the street only and make the Busa road-illegal, (or barely road legal).

I've read tons about motor exchanges (sending off your stock motor for a built 1300+CC motor) with cash on my end. How would my busted 2nd gear affect these negotiations?

Better to have the shift fork fixed or just buy a new stock motor and sawp it? -- money wise? I hear fixing the snd gear fork (w/ labor) could be just as costly as buying a new motor (even though my motor is low miles for an '05).

What companies would you recommend for repair, replacement, motor upgrade swap? Looking mostly to transform to a drag bike but open mile racing would be fun too.

No turbo now, really just interested in a 1397 kit.

thanks for flaming and constructive criticism.

Austin
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Old 01-04-2010, 01:32 PM   #2
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might be best to pm zxallan about this sort of thing
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Old 01-04-2010, 01:36 PM   #3
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Once the motor is out the transmission is not that difficult of a job. If you know anyone with any bike engine experience to help, you could do the tranny and 1397 kit yourself. I say that easy enough because I do my own stuff. I know this does not apply to everyone.
I dont know of any guys around Houston. Johnny Cheese out near Austin(?) put a 1397 in a friend's bike and it ran pretty good.
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Old 01-04-2010, 01:37 PM   #4
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+1 on pm'ing zxalan.
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Old 01-04-2010, 01:39 PM   #5
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Granted, you only need to replace one shift fork. You should be able to replace it without dropping the motor or splitting the case. That's how it was on my 636. However, I did have to split the case to pull out the gears. Service manual FTW!
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Old 01-04-2010, 01:40 PM   #6
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Yeah, I know Alan's not on right now - but would sure appreciate his advice later.

Let's say I traded for a 1397 block - anyone round these parts that could do install without raping me?

What supporting mods are required/ fan/battery, harness, injectors, tune, starter, etc. (sorry, my account at Psychobike was disabled for some shifer reason).
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Old 01-04-2010, 01:45 PM   #7
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Quote:
Originally Posted by dudewhrsmybike View Post
Granted, you only need to replace one shift fork. You should be able to replace it without dropping the motor or splitting the case. That's how it was on my 636. However, I did have to split the case to pull out the gears.
I was told (by a former sponsor of this site) that splitting the case was necessary and that it would cost more than just dropping in a new motor. If I'm going to drop a new motor might as well go APE and spend the loot - however, their site now only lists (that I can find) an exchange for a 1441 complete block - what happened to the 1340s and 1397s?

I wonder if I could find a built/reliable motor out there ready to go?
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Old 01-04-2010, 01:46 PM   #8
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Granted, you only need to replace one shift fork. You should be able to replace it without dropping the motor or splitting the case. That's how it was on my 636. However, I did have to split the case to pull out the gears. Service manual FTW!
I suck. Last time I used a service manual I ended up with about 47 parts left over, lol
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Old 01-04-2010, 01:52 PM   #9
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Tha happens to me ^^^^ lmao. I just look at it that the bike is lighter.
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Old 01-04-2010, 01:52 PM   #10
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If you are gonna do 1397 or whatever. I would just use your motor and have someone go though it. Replace all rod and crank bearings. An change the shiftforks and gears if you need it. A known good low miles motor from a shop. Not eBay. Is gonna run you between 2-2.5k. I sold three last year for 2200. So my opinion is if your gonna do motorwork. Rebuild yours. It will be cheaper in the long run
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Old 01-04-2010, 01:53 PM   #11
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Quote:
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I suck. Last time I used a service manual I ended up with about 47 parts left over, lol
They build in extras for when goobs like you work on your bikes.

And why spend all that money on a poser bike? Just buy some CF fairings and an ICON sticker kit and youre good to go
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Old 01-04-2010, 01:54 PM   #12
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Quote:
Originally Posted by cashtown View Post
Yeah, I know Alan's not on right now - but would sure appreciate his advice later.

Let's say I traded for a 1397 block - anyone round these parts that could do install without raping me?

What supporting mods are required/ fan/battery, harness, injectors, tune, starter, etc. (sorry, my account at Psychobike was disabled for some shifer reason).
Installing a complete new motor is cake. I'm sure with enough beer and pizza you could get some guys to do it in a day for ya.
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Old 01-04-2010, 01:56 PM   #13
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The Busa requires case splitting, and if the fork has been bent a while you'll probably need a gear or two as well, not super expensive but not exactly cheap either.

You're really asking 2 questions here.
If you're looking to rebuild the engine / add performance, the trans repair won't be much more as the engine will already be apart.

The cost of the build will depend on what you're looking to achieve, what peripherals you already have like pipe, PC3 etc. and how much wear is on the current engine.

However if it's just to get the bike rideable again than that's a bit different.

With 30k on the clock it's going to be your call on the cost of repairing the trans vs swapping in a used engine. I'm assuming you're the original owner so you would know best what kind of life the engine has had so far.
Legit good used Busa engines are neither plentiful or cheap, plus you'll have the swap labor.

If you'd like to discuss it further give me a call tomorrow at the shop.
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Old 01-04-2010, 01:59 PM   #14
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Hi Austin, couple ideas, your cheapest route is a used engine or fix the trans on the original, and it does not have a cassette type trans so the engine does come out and split the case, and of course if U wanna go bigger then there are several routes to go, If U have any questions lmk, thanks Tim
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Old 01-04-2010, 01:59 PM   #15
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ooh yea ive got a couple of busa core motors here at the shop if you end up needing some paarts for yours
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Old 01-04-2010, 02:06 PM   #16
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thanks everyone.

Still kind of confused about rebuilding vs. just swapping for a built motor.

Soemone in my position - original owner - bike never terribly beaten up on (except thrashing second gear) looking to go 1397 (bike did sit for a year but was made roadworthy by Tim) what are the best options?

Replace with stock core and build from there?

Take a hit on trading in a damaged motor for a built one?

Rebuild what's broken and start from there?

I'd really like a nice honest 190+ hp motor w/ no lights for drag use only. Stuff like quick shifter and swinger would obviously come later.

I just don't wanna spend a pile on a rebuild when I could have spent a couple Gs more and come out with what I'm really after.
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Old 01-04-2010, 02:07 PM   #17
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Installing a complete new motor is cake. I'm sure with enough beer and pizza you could get some guys to do it in a day for ya.
Forget pizza and beer - I'd gladly pay for any help!
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Old 01-04-2010, 02:11 PM   #18
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your best bet bro is to rebuild what you have. if a stock motor runs 2k plus then a built one will run even more. me personally i wouldnt want a used built motor. cheapest thing is to rebuild your the way you want it.

as long as i dont throw a rod i will always rebuild and modify what i have. its a lot cheaper
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Old 01-04-2010, 02:12 PM   #19
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Quote:
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The Busa requires case splitting, and if the fork has been bent a while you'll probably need a gear or two as well, not super expensive but not exactly cheap either.

You're really asking 2 questions here.
If you're looking to rebuild the engine / add performance, the trans repair won't be much more as the engine will already be apart.

The cost of the build will depend on what you're looking to achieve, what peripherals you already have like pipe, PC3 etc. and how much wear is on the current engine.

However if it's just to get the bike rideable again than that's a bit different.

With 30k on the clock it's going to be your call on the cost of repairing the trans vs swapping in a used engine. I'm assuming you're the original owner so you would know best what kind of life the engine has had so far.
Legit good used Busa engines are neither plentiful or cheap, plus you'll have the swap labor.

If you'd like to discuss it further give me a call tomorrow at the shop.

Bike is completely stock. I'd like to add a Brocks Sidewinder to the new motor - other than that time will tell.

I'm not exactly ready to plop down the cash - so I'm looking at ballpark figures. What, approximately, are we talking about for core exchange/rebuild and upgrade to larger displacement w/ supporting mods?
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Old 01-04-2010, 02:13 PM   #20
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So, Motorcycles Unlimited offers these services? What about port and polish heads? Does Andy do that work still?
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