rebuilding r1 roadbike

[jezza1]

hey guys,

just wondering how hard it would be to replace a big end bearing on a roadbike? (05 Yamaha r1)

ive done top ends n shit before but never down into the crankcase... And what other things could possibly be wrong? The engine still starts and runs, its just really noisy from the bearing...

Any1 thats got a mechanical background please let me know :)

Option B is.. im thinking of pulling it down.. getting the parts then getting a mechanic to put it back together?

cheers in advance for any help :)

[corsa]

Well, depends on how much you like working on motors, how much time, money saved, tools and equipment you have etc...
R1's are fairly easy to work on.

A couple of questions though.

1. How do you know it's Big end bearings that are shot?

2. How many kays has the bike done?

3. Has it been raced/Crashed?

4. Did the bike run on it's side for any length of time?

Lots of questions I know, but you did ask.

Corsa.

[daskip]

hey guys,

just wondering how hard it would be to replace a big end bearing on a roadbike? (05 Yamaha r1)

ive done top ends n shit before but never down into the crankcase... And what other things could possibly be wrong? The engine still starts and runs, its just really noisy from the bearing...

Any1 thats got a mechanical background please let me know :)

Option B is.. im thinking of pulling it down.. getting the parts then getting a mechanic to put it back together?

cheers in advance for any help :)


be better off buying a good motor from a wrecker or ebay

i priced up a crankcase for my 05 gsxr-1000 i had and it comes as a set in 3 pieces and the dealer wanted $4500 :1peek:

[CunningStunter]

I have some, (alot) of experience in this area.

Our stunt bikes get a pretty hard time. When you're donig wheelies up to 200KPH at balance point, the sump runs dry and eventually you fuk the big end.

I have gone through 3 big ends on my GSXRs over the last 5 bikes (all big ends went on stunt bikes) and you are MUCH MUCH MUCH better off just buying a 2nd hand engine for like 2-3K. Rebuilding them is NOT an option. *edit - price wise*

One way of finding out if it's the big end is this:
Intially, when the big end starts going ,there will be no noise with no load (in neutral).
Put her in gear and the noise will appear at a certain rev range. Starts out this way remember and will get worse. At this point sounds like it's almost running lean (ie: sounds like a glass jar with 5 cent coins inside being shaken).

Eventually it will get so bad it will make the noise just on start up.

If you have not dumped the oil yet, do it and pass it through a filter. A goldie/bronze colour metal shavings will indicate it's the big end or the casing of the big end bearing letting go.


Part of the problem in doing it yourself is yes you can buy the parts but it's hella expensive, crank needs a grind, still need to pay labour etc etc, trust me when I say (and daskip as well ;o) that you're better off with a whole new engine.......

My only other suggestion is for the 3-5K it could cost you, find an 05 R1 either at www.adrenalinpb.com.au or www.motorcycledisposals.com.au and buy a whole (crashed) bike for the same price. Use the engine and end up with a bunch of handy spares like wheels, forks, swinger etc etc (providing they are ok LOL).

We've bought probably 12-15bikes from these places (aswell as Pickles, Fowles etc) for either stunters or for spare engines, wiring looms etc so know that this is a well trodden path that will force ppl to the replacement engine option VS fixing....


All the best. If you need a hand, advice or info just flick us a line.

[corsa]

Ha,ha,ha, lol..... I was trying let jezza down slowly...

But Yes, as CunningStunter and others say, if the motor is cactus, buy a Complete motor or a Crashed bike, Waaaaay easier.

Corsa.