A piece of my piston broke

[Moosa]

Hey guys,

I was riding my blaster earlier today and I heard a slight knocking sound like bad tappets on a car, the bike was moving fine though.

After a while the bike just lost all power and the noise became loud. The first thing that came to my mind was piston slapping,tried to start the bike and there wasn't any compression, thought the rings were buggered, I opened up the engine and noticed that the piece of the piston broke off, the sleeve looks fine and when I moved the piston inside the sleeve it moved up and down just fine. Now the piston is only broken so do I just change that or what else should I check for ?

And If I want to put a bigger piston how do I go about ? I'm thinking a wiseco 68 mm ? Will that work, just the piston and a bore ? First time I'm doing a engine build so please help me along.

Thanks

 

[Larry's Shee]

Any good shop can measure the bore and tell you what size it needs to be bored to so it is straight and round.
Don't even think of throwing a new piston in a worn out hole.
Only $40-$60 more to bore it.

 

[Moosa]

Any good shop can measure the bore and tell you what size it needs to be bored to so it is straight and round.
Don't even think of throwing a new piston in a worn out hole.
Only $40-$60 more to bore it.

What's the biggest piston I can put without changing the crankshaft ? And will that give me more power ?And also will a high compression piston give me more power ? I don't have much money to spend so I can't go all out unfortunately

 

[Awk08]

only go to the next bore that restores your cylinder to specs, with oversize piston to match.
overboring provides almost zero performance and just wastes bores.

skip the high compression piston and/or gaskets.
a better option is a modified head @ http://kenoconnorracing.com/
he can also bore that cylinder and provide a matching piston.
bunches of us on here have found it to be well worth the cost of shipping to have it done to perfection

 

[OConnor Racing]

Where's the rest of the piston?

 

[Blaaster]

Where's the rest of the piston?

When the cases are split it will prolly be found lurking in the basement.

 

[Moosa]

Where's the rest of the piston?

The other pieces got crushed up on the top of the piston...I only found one piece but the rest was crushed up

 

[Moosa]

The other pieces got crushed up on the top of the piston...I only found one piece but the rest was crushed up

Look at the first pic I posted of the piston...you can see the pieces binded together on the piston itself..

 

[Moosa]

I was thinking about stroking it to 240 but that's gonna hurt my wallet...I'm thinking about putting a superbike engine in, similar money but much more power ...anyone ever done that before ? If so do you have any tips for me ?

 

[joeak47]

Stick with the blaster engine.

 

[BlackBlaster86]

Prepare to pull the motor for a complete tear down. Your gonna need a new crank, case seals, top end piston kit along with a bore and hone.

Good luck

 

[Markblaster]

Look at the engine swaps here.
http://www.blasterforum.com/forums/engine-mods-and-swaps.129/

 

[Moosa]

Prepare to pull the motor for a complete tear down. Your gonna need a new crank, case seals, top end piston kit along with a bore and hone.

Good luck

Prepare to pull the motor for a complete tear down. Your gonna need a new crank, case seals, top end piston kit along with a bore and hone.

Good luck

Why a new crank ?

 

[Moosa]

Prepare to pull the motor for a complete tear down. Your gonna need a new crank, case seals, top end piston kit along with a bore and hone.

Good luck

Making me worry cause here in south Africa parts aren't cheap

 

[Moosa]

Quick question...from looking at the piston in the pic...is it the normal Yamaha piston or no ?

This bike had go ! Ate a Yamaha yfz450r with it while having a passenger sitting with me...or do all blasters do that ? I have no idea what's done to the bike even though I've had it for over 8 years...as soon as I open the throttle full the front wheels lift off

 

[Markblaster]

Got photos of the bike?

 

[Moosa]

Got photos of the

Got photos of the bike?

Nope , I will take some soon, its parked at a freinds house

Rebuilt the whole bike myself...only thing I didn't touch was the engine...everything else is new

 

[joeak47]

This bike had go ! Ate a Yamaha yfz450r with it while having a passenger sitting with me...or do all blasters do that ?

Come on, come on.... bullshit.
I don't believe that for a second.
Was the 450 started and running, or sitting still with the kill switch turned off?

 

[Moosa]

Come on, come on.... bullshit.
I don't believe that for a second.
Was the 450 started and running, or sitting still with the kill switch turned off?

Believe what you wanna...hearing is decieving,seeing is believing...450's aren't even that fast so I don't get why its unbelievable

 

[Moosa]

Come on, come on.... bullshit.
I don't believe that for a second.
Was the 450 started and running, or sitting still with the kill switch turned off?

I'm talking about the 450 quad bike just so you know