[skorpia]

OK i have a 93 900rr, and after it was hit twice last year, i started having some major problems so i parked it for about 8 months I started striping the bike down, dropped the motor out, replaced my valve seals and found out that the cylinders had a tiny bit of rust in them from sitting too long. Saved up for pistons, and after a 3 week wait from Honda - the suckers showed up this morning at work and i shipped them and the cylinders off to APE to be bored out. So i have the next 3-4 weeks to get my bike ready for when i get my cylinders back and start rebuilding the motor again....


so enjoy the pics, and watch the fighter come out to play

[bladeracer]

Originally Posted by skorpia

OK i have a 93 900rr, and after it was hit twice last year, i started having some major problems so i parked it for about 8 months I started striping the bike down, dropped the motor out, replaced my valve seals and found out that the cylinders had a tiny bit of rust in them from sitting too long. Saved up for pistons, and after a 3 week wait from Honda - the suckers showed up this morning at work and i shipped them and the cylinders off to APE to be bored out. So i have the next 3-4 weeks to get my bike ready for when i get my cylinders back and start rebuilding the motor again....


so enjoy the pics, and watch the fighter come out to play

If you're boring it out why did you need to wait for Honda pistons?
Why not put aftermarket pistons in?

[skorpia]

cuz im only going 1mm over - i ride hard and cuz its normally my daily driver - id rather not effect the reliability too much

[bladeracer]

Originally Posted by skorpia

cuz im only going 1mm over - i ride hard and cuz its normally my daily driver - id rather not effect the reliability too much

I wouldn't think +1mm is likely to affect reliability as Wiseco do kits for boring to +2mm so the liners must be pretty solid.
I would think aftermarket pistons would be made to a higher standard than mass-produced Honda ones though.
I was thinking maybe you were running pistons from a different engine.

[skorpia]

nope, i like honda. it was also several hundred bucks cheaper to go honda.

ill prolly never run a wiseco in my bike. aside from being way over priced, i see too many bikes come in with cracked/broken wiseco pistons. And i only wanna do this once. a full engine tear down is too much a pain in the ass JUST to replace pistons. i understand why they designed the engine the way it is - but i still dont like it..

[bladeracer]

Originally Posted by skorpia

nope, i like honda. it was also several hundred bucks cheaper to go honda.

ill prolly never run a wiseco in my bike. aside from being way over priced, i see too many bikes come in with cracked/broken wiseco pistons. And i only wanna do this once. a full engine tear down is too much a pain in the ass JUST to replace pistons. i understand why they designed the engine the way it is - but i still dont like it..

I only checked Wiseco to see how far the engine can be bored safely :-)
There are a _lot_ of aftermarket piston manufacturers though.
I agree about only doing the job once which is why I would go for a good forged high-compression piston if it were my bike. I'm not big on tearing a motor down just to put it back together at standard spec :-)

[skorpia]

well its a 1mm over, and with the 889 engine, should be enough to make a tiny difference. add in a high comp head gasket, mod'ed air box, stage 3 jet kit, custom exhaust (undertail) and this baby will be flying!! She only pulled 86HP on our dyno before blowing out a lot of smoke at high RPM. so im hoping for at least 110-115hp when im done with her

[bladeracer]

Originally Posted by skorpia

well its a 1mm over, and with the 889 engine, should be enough to make a tiny difference. add in a high comp head gasket, mod'ed air box, stage 3 jet kit, custom exhaust (undertail) and this baby will be flying!! She only pulled 86HP on our dyno before blowing out a lot of smoke at high RPM. so im hoping for at least 110-115hp when im done with her

I would think just putting new rings in would regain more power than the +1mm capacity increase will. The 919 is just an 893 bored 1mm after all :-)
Have you considered putting 1000RR injection on it?
Higher compression produces a lot more heat than power but should be good for 1-2%.
The undertail exhaust might cost you some topend but the extra length should be good for midrange.
86hp is _really_ bad, do you know what caused it?
I would think 115hp should be easy as you should be able to get more than the stock 919 put out when they were new.
Can't wait to find out :-)

[skorpia]

Originally Posted by bladeracer

I would think just putting new rings in would regain more power than the +1mm capacity increase will. The 919 is just an 893 bored 1mm after all :-)
Have you considered putting 1000RR injection on it?
Higher compression produces a lot more heat than power but should be good for 1-2%.
The undertail exhaust might cost you some topend but the extra length should be good for midrange.
86hp is _really_ bad, do you know what caused it?
I would think 115hp should be easy as you should be able to get more than the stock 919 put out when they were new.
Can't wait to find out :-)

1000rr injection?????

do tell!!!


as far as the bad HP, we think its a combo of bad rings and bad valve seals

[bladeracer]

Originally Posted by skorpia

1000rr injection?????

do tell!!!


as far as the bad HP, we think its a combo of bad rings and bad valve seals

You could try fitting the injection off anything really but you said you prefer Honda :-)
You would have to fit the full 1000RR harness, ECU, instrument cluster and the engine sensors but I'm sure it wouldn't be too hard to get it working. Apart from the obvious horsepower potential, the biggest advantage to my mind on a seriously modified engine is the ease of tuning with a PC instead of having to mess with jets and needles.
Are you considering cams and/or flatslides as they would both be good bang for buck.
Are you porting the head while it's off?

[skorpia]

Originally Posted by bladeracer

You could try fitting the injection off anything really but you said you prefer Honda :-)
You would have to fit the full 1000RR harness, ECU, instrument cluster and the engine sensors but I'm sure it wouldn't be too hard to get it working. Apart from the obvious horsepower potential, the biggest advantage to my mind on a seriously modified engine is the ease of tuning with a PC instead of having to mess with jets and needles.
Are you considering cams and/or flatslides as they would both be good bang for buck.
Are you porting the head while it's off?

oh no...now im going to be thinking about this today to see it its doable $$ wise...

no cams....dident think of flatslides but ill have to check into that now - cn ya point me in the right direction??

Maybe on porting the head...its still up in the air...

[LoopyLee]

Will watch your build with interest

[bladeracer]

Originally Posted by skorpia

oh no...now im going to be thinking about this today to see it its doable $$ wise...

no cams....dident think of flatslides but ill have to check into that now - cn ya point me in the right direction??

Maybe on porting the head...its still up in the air...

I don't know what the general concensus is but I'd probably go with cams before the carbs. It's a bit more work putting cams in compared to just swapping the carbs and I'd expect more return from the cams with stock carbs than from flatslides with stock cams. The carbs are probably considerably more expensive as well. Not usre what you mean about direction. Something like these would be nice :-)
KEIHIN FCR 39mm FLATSLIDES 4-CBR900RR (93-99):eBay Motors (item 300323560936 end time Jun-27-09 19:56:04 PDT)

[skorpia]

wow...ill have to think about those. if i can get some of my spare parts sold i can prolly do it will check out cams and see what i can come up with - just dont wanna risk blowing the engine up cuz ive done too much

[bladeracer]

Originally Posted by skorpia

wow...ill have to think about those. if i can get some of my spare parts sold i can prolly do it will check out cams and see what i can come up with - just dont wanna risk blowing the engine up cuz ive done too much

I don't think these things make the engine more volatile, just harder to ride.
To gain peak power you basically take it from the midrange.
It's like the difference between the 100hp Bandit 1200 and the 135hp GSXR1100 - same engine but totally different power characteristics.

[929ADAM]

damn! doing all this...you gonna have any $ left for the rest of the bike? lol.

cant wait to see it. what else you have planned aside from the motor build?

[skorpia]

Originally Posted by 929ADAM

damn! doing all this...you gonna have any $ left for the rest of the bike? lol.

cant wait to see it. what else you have planned aside from the motor build?

ummm...WAY too much...

exhaust, headlight, gauges, tailsection....


and one of these days a SSA convo....but that will be when i have money again lol

[929ADAM]

cool cool. cant wait to see it progress

[Sideshow bob]

*

*while awaiting pics

[Twincam]

Originally Posted by Sideshow bob

*

*while awaiting pics

I'll join you

[MMA03954]

[skorpia]

Dents suck...even more so when its dents i dident make...

removing dents, and doing lots of body work/prep work....

will be painting in a few weeks...

[TattooedGQ]

What's with all the 'fighter stuff recently....making me want to do one.......

[Sideshow bob]

Originally Posted by TattooedGQ

What's with all the 'fighter stuff recently....making me want to do one.......

Do one..... we'll watch with interest

& Fighters are the New Black*

*well... errrr.... technicaly, blacks still black and fighters have been around since the first sports bike got dropped by an owner too poor to replace all the parts.. now people do them without all the sliding down the road shinnanigans

[skorpia]

ive been wanting to do one for a long time now, just now getting around to it cuz i want something diffrent - and there is no true fighters around here (home made is the only way to go!)

[TattooedGQ]

Originally Posted by Sideshow bob

Do one..... we'll watch with interest
& Fighters are the New Black*

That's all the convincing I need.......I already pulled myself away from actual work to lurk around the .org....now I'm going to pull myself away from the .org to find me a project on Craigslist...

Originally Posted by skorpia

(home made is the only way to go!)

I couldn't agree more.

[Sideshow bob]

Originally Posted by TattooedGQ

That's all the convincing I need.......I already pulled myself away from actual work to lurk around the .org....now I'm going to pull myself away from the .org to find me a project on Craigslist...

best you start a thread about it... so i can start watching

Originally Posted by skorpia

and there is no true fighters around here (home made is the only way to go!)

to me a TRUE fighter is home made....

these ahum factory fighters*, although nice to look at, defeat the object of having a fighter

*like factory customs/choppers.... a true chopper to me has to be home bodged... errr i mean... built

[TattooedGQ]

Christ, don't get me started on the "I want to be like the guys on TV" custom(aka assembly line) choppers....

Sorry to quasi thread-jack Skorpia, I'm done for now....... I'll make it up to you when I hop on that plane.

[skorpia]

LOL they are expensive projects...im about to start taking donations for mine

[skorpia]

Originally Posted by TattooedGQ

Sorry to quasi thread-jack Skorpia, I'm done for now....... I'll make it up to you when I hop on that plane.

its all good...its keeping me entertained on whats turning out to be a really really slow day at work