How moto are you . Name this wound

WestoftheElwha

This was inflicted during routine maintenance…..

I never learn done this a million times.image 147

What caused it ?

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TAUTOG
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TAUTOG 12/18/2024 1:20pm
12/18/2024 1:20pm

2 teeth marks?

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Dirtfighter
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Dirtfighter 12/18/2024 1:24pm
12/18/2024 1:24pm

Dang sprocket bit  ya didn’t it.

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GrapeApe
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GrapeApe 12/18/2024 1:25pm
12/18/2024 1:25pm

Using the foot peg to pop open a beer bottle?

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sumdood
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sumdood 12/18/2024 1:26pm
12/18/2024 1:26pm

Old man tissue paper skin would be my guess

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The Shop

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Camp332
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Camp332 12/18/2024 1:31pm
12/18/2024 1:31pm
WestoftheElwha wrote:
This was inflicted during routine maintenance…..I never learn done this a million times.What caused it ?

This was inflicted during routine maintenance…..

I never learn done this a million times.image 147

What caused it ?

Lack of Okeeffes, Bro. 

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abn-166
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abn-166 12/18/2024 1:33pm
12/18/2024 1:33pm

Yamathumb.

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mgifracing 12/18/2024 1:35pm
12/18/2024 1:35pm
abn-166 wrote:

Yamathumb.

I was going that route too but then noticed, Even with the Yamaha bar bend that wound is in the wrong spot.

1
ksithumper 12/18/2024 1:40pm
12/18/2024 1:40pm

JT, AFAM, or Renthal?

mx317
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mx317 12/18/2024 1:47pm
12/18/2024 1:47pm
abn-166 wrote:

Yamathumb.

My guess also

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MXSharc
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MXSharc 12/18/2024 1:52pm
12/18/2024 1:52pm Edited Date/Time 12/18/2024 1:54pm

GrapeApe on it - 

That's from a cotter pin 

Main Image

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Tim507
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Tim507 12/18/2024 1:54pm
12/18/2024 1:54pm

Foot peg spring

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Hammer 663s
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Hammer 663s 12/18/2024 1:56pm
12/18/2024 1:56pm

Foot peg. Slipped when hand kick-starting a 2 stroke.

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kylemenz1 12/18/2024 1:57pm
12/18/2024 1:57pm

 Changing tube/tire. 

WestoftheElwha 12/18/2024 2:27pm
12/18/2024 2:27pm

Hammer 663 WINS .

 It was measuring squish . 

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motodad805
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motodad805 12/18/2024 2:28pm
12/18/2024 2:28pm

Gotta go with foot peg install 

1
MxAddic
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MxAddic 12/18/2024 2:41pm
12/18/2024 2:41pm
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Hammer 663s
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Hammer 663s 12/18/2024 2:56pm
12/18/2024 2:56pm
WestoftheElwha wrote:

Hammer 663 WINS .

 It was measuring squish . 

I've done that so damn many times. 

1

Pit Row

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Camp332
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Camp332 12/18/2024 3:04pm
12/18/2024 3:04pm

Good job, Hammer!

2
MxAddic
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MxAddic 12/18/2024 3:12pm
12/18/2024 3:12pm

"measuring squish" is routine? 

1
Hammer 663s
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Hammer 663s 12/18/2024 4:49pm
12/18/2024 4:49pm
MxAddic wrote:

"measuring squish" is routine? 

Sure it is when you are looking for that last 1/2 hp on a mod supermini or 125. Just checking your X isn’t enough. 

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profeshenal125 12/18/2024 9:31pm
12/18/2024 9:31pm

Got too close to The Double Boost Port 04 cr125 . Without pre otherisation from the owner . And the DBP nipped ya ? IMG 1833

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MxAddic
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MxAddic 12/19/2024 3:18am
12/19/2024 3:18am
MxAddic wrote:

"measuring squish" is routine? 

Hammer 663s wrote:

Sure it is when you are looking for that last 1/2 hp on a mod supermini or 125. Just checking your X isn’t enough. 

You only need to set it one time when you build the engine. Once it’s set it never changes or has to be maintained for the life of the engine.

philG
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philG 12/19/2024 5:00am
12/19/2024 5:00am
MXSharc wrote:
GrapeApe on it - That's from a cotter pin 

GrapeApe on it - 

That's from a cotter pin 

Main Image

Thats a split pin.

Hammer 663s
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Hammer 663s 12/19/2024 10:59am
12/19/2024 10:59am Edited Date/Time 12/19/2024 11:02am
MxAddic wrote:

"measuring squish" is routine? 

Hammer 663s wrote:

Sure it is when you are looking for that last 1/2 hp on a mod supermini or 125. Just checking your X isn’t enough. 

MxAddic wrote:
You only need to set it one time when you build the engine. Once it’s set it never changes or has to be maintained for the...

You only need to set it one time when you build the engine. Once it’s set it never changes or has to be maintained for the life of the engine.

No. Every time you do a top end on a race motor you check squish. Takes 2 minutes. Tolerances can change over time and base gasket thickness isn't always consistent. On our race 125 I had 3 different inserts to choose from and squish was different for each one. Not that I changed them much. If you are going bleeding edge on a 5 hour piston you need to be sure that you aren't going to hole it in the first 30 minutes. Well, maybe "sure" is too strong. It can still happen when you run on the edge.

MxAddic
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MxAddic 12/19/2024 11:49am
12/19/2024 11:49am
Hammer 663s wrote:

Sure it is when you are looking for that last 1/2 hp on a mod supermini or 125. Just checking your X isn’t enough. 

MxAddic wrote:
You only need to set it one time when you build the engine. Once it’s set it never changes or has to be maintained for the...

You only need to set it one time when you build the engine. Once it’s set it never changes or has to be maintained for the life of the engine.

Hammer 663s wrote:
No. Every time you do a top end on a race motor you check squish. Takes 2 minutes. Tolerances can change over time and base gasket...

No. Every time you do a top end on a race motor you check squish. Takes 2 minutes. Tolerances can change over time and base gasket thickness isn't always consistent. On our race 125 I had 3 different inserts to choose from and squish was different for each one. Not that I changed them much. If you are going bleeding edge on a 5 hour piston you need to be sure that you aren't going to hole it in the first 30 minutes. Well, maybe "sure" is too strong. It can still happen when you run on the edge.

"AI Overview

 
No, a top-end rebuild is generally not considered "routine maintenance" as it is a more significant repair that needs to be done periodically based on usage and wear, unlike regular oil changes, filter replacements, or tire pressure checks which are considered routine maintenance; however, it is important to include a top-end rebuild within your overall maintenance plan for engines that experience heavy use, especially in applications like dirt bikes or high-performance vehicle
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Dirty Points 12/19/2024 11:52am
12/19/2024 11:52am Edited Date/Time 12/19/2024 11:57am
MxAddic wrote:
You only need to set it one time when you build the engine. Once it’s set it never changes or has to be maintained for the...

You only need to set it one time when you build the engine. Once it’s set it never changes or has to be maintained for the life of the engine.

Hammer 663s wrote:
No. Every time you do a top end on a race motor you check squish. Takes 2 minutes. Tolerances can change over time and base gasket...

No. Every time you do a top end on a race motor you check squish. Takes 2 minutes. Tolerances can change over time and base gasket thickness isn't always consistent. On our race 125 I had 3 different inserts to choose from and squish was different for each one. Not that I changed them much. If you are going bleeding edge on a 5 hour piston you need to be sure that you aren't going to hole it in the first 30 minutes. Well, maybe "sure" is too strong. It can still happen when you run on the edge.

MxAddic wrote:
"AI OverviewLearn more No, a top-end rebuild is generally not considered "routine maintenance" as it is a more significant repair that needs to be...

"AI Overview

 
No, a top-end rebuild is generally not considered "routine maintenance" as it is a more significant repair that needs to be done periodically based on usage and wear, unlike regular oil changes, filter replacements, or tire pressure checks which are considered routine maintenance; however, it is important to include a top-end rebuild within your overall maintenance plan for engines that experience heavy use, especially in applications like dirt bikes or high-performance vehicle

Honda owner's manual says top end is routine maintenance for a cr125. Same schedule as oil change that the AI identified.

topend
GrapeApe
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GrapeApe 12/19/2024 12:30pm
12/19/2024 12:30pm Edited Date/Time 12/19/2024 1:48pm
MxAddic wrote:
You only need to set it one time when you build the engine. Once it’s set it never changes or has to be maintained for the...

You only need to set it one time when you build the engine. Once it’s set it never changes or has to be maintained for the life of the engine.

Hammer 663s wrote:
No. Every time you do a top end on a race motor you check squish. Takes 2 minutes. Tolerances can change over time and base gasket...

No. Every time you do a top end on a race motor you check squish. Takes 2 minutes. Tolerances can change over time and base gasket thickness isn't always consistent. On our race 125 I had 3 different inserts to choose from and squish was different for each one. Not that I changed them much. If you are going bleeding edge on a 5 hour piston you need to be sure that you aren't going to hole it in the first 30 minutes. Well, maybe "sure" is too strong. It can still happen when you run on the edge.

MxAddic wrote:
"AI OverviewLearn more No, a top-end rebuild is generally not considered "routine maintenance" as it is a more significant repair that needs to be...

"AI Overview

 
No, a top-end rebuild is generally not considered "routine maintenance" as it is a more significant repair that needs to be done periodically based on usage and wear, unlike regular oil changes, filter replacements, or tire pressure checks which are considered routine maintenance; however, it is important to include a top-end rebuild within your overall maintenance plan for engines that experience heavy use, especially in applications like dirt bikes or high-performance vehicle

Always entertaining to see what dumb shit you'll argue about on any given day. Another thread-wreck. 

7
Hammer 663s
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Hammer 663s 12/19/2024 12:37pm
12/19/2024 12:37pm
MxAddic wrote:
"AI OverviewLearn more No, a top-end rebuild is generally not considered "routine maintenance" as it is a more significant repair that needs to be...

"AI Overview

 
No, a top-end rebuild is generally not considered "routine maintenance" as it is a more significant repair that needs to be done periodically based on usage and wear, unlike regular oil changes, filter replacements, or tire pressure checks which are considered routine maintenance; however, it is important to include a top-end rebuild within your overall maintenance plan for engines that experience heavy use, especially in applications like dirt bikes or high-performance vehicle

You rely on your AI. I’ll rely on my 40+ years doing this and the advice of my engine builder. Most of my 2Ts are built for 15 hour piston life and I’ve done dozens of moto top ends in the last 10 years from 65s thru 250s, and more among the RD250-400s that I restore. Blown a few up too. No one is perfect and racing stresses things way more than standard riding. Last failure was a casting flaw on a KTM power valve chamber that took out the motor with 1/2 lap to go at LL Regionals in Washougal. Still managed to get it across the line but it wasn’t pretty and it hydro locked on the way to the pits.  

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