LRRS Round 7 ULSB Video

[CEO]

[youtube]8syPa3zqRTQ[/youtube]

[13]

GET OVER THE WALL!!

[The Snowman]

Rut roh. You & Mr Tricky find anything yet?

[lrrs313]

That sounded ugly. What ended up letting go?

[CEO]

Rut roh. You & Mr Tricky find anything yet?

Let me get the pics off my camera

That sounded ugly. What ended up letting go?

It's hard to tell... there was a lot of collateral damage. One crank bearing had a lot of play and I think that may have set off a chain reaction... one result is that the wrist pin sheared in half



Good news is I was doing 23's on it in practice... i'm digging for the optimistic side here

[lrrs313]

It's hard to tell... there was a lot of collateral damage. One crank bearing had a lot of play and I think that may have set off a chain reaction... one result is that the wrist pin sheared in half



Good news is I was doing 23's on it in practice... i'm digging for the optimistic side here

Ouch. Nice on the 23s though. One other positive thing: it's a Honda, not a KTM. Parts are cheaper and WAY easier to get. Any damage to the head?

[CEO]

Also I have the R6 so I can still race round 8 which is nice haha

Ouch. Nice on the 23s though. One other positive thing: it's a Honda, not a KTM. Parts are cheaper and WAY easier to get. Any damage to the head?

I think the head is fine... one valve had a small shaving sticking down out of it so I guess that could have damaged the seat when it got clamped in there but it didn't look like it. I need to get a valve spring compressor and pull the valve to see. Since this will basically be a winter rebuild now I would have had the head cleaned up anyways.

[lrrs313]

Even if you have to replace the valve or have one seat cleaned up that's not bad. My KTM is done for the season. It didn't stop running, but it's WAY down on power, so I'm going to go through it before something really expensive happens (the cylinder alone for mine is almost $1000). You're not going to put the CRF back together for the last race?

[CEO]

I noticed the CRF was wayyyy down on power on the warmup lap for that race.... but I was like fuck it I'll just brake later lol

Nah the cylinder is fucked, piston cracked, crank has dings on it from the sheared wrist pin jamming between it and the cases.... it will be a winter project. Still need to figure out what can be salvaged and what I need to get, what direction I want to go with the build, etc...

[lrrs313]

I noticed the CRF was wayyyy down on power on the warmup lap for that race.... but I was like fuck it I'll just brake later lol

Nah the cylinder is fucked, piston cracked, crank has dings on it from the sheared wrist pin jamming between it and the cases.... it will be a winter project. Still need to figure out what can be salvaged and what I need to get, what direction I want to go with the build, etc...

Yeah I tried the brake later, more corner speed thing. Workin my ass off for 25s, fuck that I'll end up crashing trying that.

Sound's like the motor did a pretty good impression of a hand grenade. That sucks. Best direction with motard motors seems to be STOCK with maybe a high compression piston and some minor head work. Otherwise you get to have this kind of fun on a regular basis.

[CEO]

with maybe a high compression piston and some minor head work.

That's exactly what it had LOL

13:1 piston, head lightly ported, I ran C12 in it.... that's it. Stock bore, stock cam and valvetrain, etc.

It just had enough time on it I guess... almost a seasons worth. I was hoping it would last to after next race weekend but I guess not

[lrrs313]

Yeah, that's a lot of time on a motard. Best bet I've seen is new piston halfway through the season, piston and crank bearings (possibly new crank, they're cheap enough for the Jap bikes) every winter.

[CEO]

Well I know Silva had 3 weekends on it before he broke his leg (which is why he sold it to me), then I put on a weekend, 2 track days / open practices... so I guess that's a lot of time. Since I only do half my races on it (other half on the r6, usually 2 races on each) I hoped it would last through the end of LRRS. Oh well.

[a13x]

Personally I wouldn't go with a High Comp piston.

Sorry about the troubles Chris.

[CEO]

Cylinder wall scored by the piston coming up cockeyed. Bottom portion of the cylinder wall cracked off



Top of cylinder cracked



Wrist pin sheared in half



Damage to cases by piece of wrist pin. As long as they seal up and hold oil, is this alright??



Dings in crank from debris... should I have it lightened and balanced or just buy a new one?



The crank bearing in the case on the left had a lot of play

[Kurlon]

OUCH... kept seeing references to your bike having trouble in various posts, but damn. it REALLY let go.

Looks like the small end of the rod is bent, so you'll need to get it pressed apart at he very least. Send it to Falicon, have them evaluate it. They'll tell you if the bells are any good, if it's repairable, have them weld it once it's repaired, that'll help keep it from spreading under load.

On the piston, if you're not running a bigger cam, don't bother with a crazy compression piston. If you throw a cam in you need the higher static comp to keep the dynamic compression up.

Edit: Cases are pretty beat up but should be salvageable, lucky for you they use a center case gasket so the mating surfaces don't have to be exact. Your piston oil jet got beat up, you'll want to replace that if possible. The cases have an interesting bulge where that big ding is, is there a through bolt or something in that area? Oil passage? If so inspect that area thoroughly before using.

[Kurlon]

Even if you have to replace the valve or have one seat cleaned up that's not bad. My KTM is done for the season. It didn't stop running, but it's WAY down on power, so I'm going to go through it before something really expensive happens (the cylinder alone for mine is almost $1000).

I know this story, I've heard it before... : )

You can get that cylinder sleeved and re-plated for half that or less.

[lrrs313]

I know this story, I've heard it before... : )

You can get that cylinder sleeved and re-plated for half that or less.

Yeah, that's the plan. She's coming apart sometime within the next couple weeks. Cylinder plated, head is going out for valves/seats/guides/springs/maybe a little cleanup.

[Fitz]

Holy $hit.

[lrrs313]

Chris -- I'd just replace the crank and rod. You can get them for under $300. Hell, motosport.com sells a complete top and bottom end rebuild kit for under $600.

[Kurlon]

Chris -- I'd just replace the crank and rod. You can get them for under $300. Hell, motosport.com sells a complete top and bottom end rebuild kit for under $600.

Holy fack! Yeah, for that money, get a new crank.

[Pittenger5]

Wow, youre lucky you didnt get packed in the backend when that gave way.

[Tricky Mike]

Also I have the R6 so I can still race round 8 which is nice haha

I think the head is fine... one valve had a small shaving sticking down out of it so I guess that could have damaged the seat when it got clamped in there but it didn't look like it. I need to get a valve spring compressor and pull the valve to see. Since this will basically be a winter rebuild now I would have had the head cleaned up anyways.

I put the head on the bench this afternoon and compressed the valves and let that piece of motor drop out. Looks like the valve seats may need to be cleaned up, but it's reeeeal minor. Looks like the head is cool.

[seth399]

damn, I've never seen a wrist pin do that. Just when I started saying I'm sick of people blowing by my on the straight I see this....maybe motor will stay stock all next year as well

[GixerJockey]

Wow, youre lucky you didnt get packed in the backend when that gave way.

People don't ride right into him... He's not you.