2017 tc 125 cylinder wear *Pic Heavy*

final touch
Edited Date/Time 8/12/2019 7:28am
Have only been out on this bike 3 times ,the first time the head cracked so replaced that and all had been well ,stripped the head of it today and noticed scoring on the cylinder walls they were not there the last time I had it apart ,should I be worried about this? and what has caused it ?i run 40:1 fully synthetic oil and it’s jetted slightly rich but runs good
I love riding the bike (long time 250f rider) but am starting to think this is a problem bike
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AJ565
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AJ565 8/11/2019 4:05pm
8/11/2019 4:05pm
Do you let the bike warm up before you ride it, or do you just hop on and go out and put heavy load on a cold engine?

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final touch 8/11/2019 11:57pm
8/11/2019 11:57pm
Thinking back i probably don’t warm it up enough before I go out but my first lap is always a slow sight lap and try not to put the bike under load ,does it look like it’s cold seizing from the pics?
danman
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danman 8/12/2019 6:15am
8/12/2019 6:15am
The first pic shows wear on the power valve, which means one of two things. 1) You aren't warming it up enough 2) The piston is way too tight/bore is not correct.
Also check your airbox/air filter to ensure it's sealed. If you allow dirt/sand through, you will get scratches.

At this point, I'd have the cylinder checked and rehoned and a new top end.

For what it's worth, my method of warming up prior to riding is to completely idle the bike until the cylinder itself is warm to the touch, then go ride. No blipping of the throttle or anything. Perhaps that's a bit extreme, but I've never had anything like that happen.
Some people wait until the wide part of the pipe is warm to the touch. I don't like that because the cylinder wall is thicker and will take a bit longer to get to temp.

good luck.
final touch 8/12/2019 6:38am
8/12/2019 6:38am
danman wrote:
The first pic shows wear on the power valve, which means one of two things. 1) You aren't warming it up enough 2) The piston is...
The first pic shows wear on the power valve, which means one of two things. 1) You aren't warming it up enough 2) The piston is way too tight/bore is not correct.
Also check your airbox/air filter to ensure it's sealed. If you allow dirt/sand through, you will get scratches.

At this point, I'd have the cylinder checked and rehoned and a new top end.

For what it's worth, my method of warming up prior to riding is to completely idle the bike until the cylinder itself is warm to the touch, then go ride. No blipping of the throttle or anything. Perhaps that's a bit extreme, but I've never had anything like that happen.
Some people wait until the wide part of the pipe is warm to the touch. I don't like that because the cylinder wall is thicker and will take a bit longer to get to temp.

good luck.
Thanks for your reply I don’t the cylinder had been touched before and is all original don’t no if it’s possible to tell by the pictures ?i did take it to a local engineer to get it honed but he said because it’s nikasil they can’t be honed and to just clean it up with a scotch brite ?

I will get a new piston ordered de glaze and scotch the cylinder and from now on warm it up the way you suggested thanks 👍
final touch 8/12/2019 6:46am
8/12/2019 6:46am
danman wrote:
The first pic shows wear on the power valve, which means one of two things. 1) You aren't warming it up enough 2) The piston is...
The first pic shows wear on the power valve, which means one of two things. 1) You aren't warming it up enough 2) The piston is way too tight/bore is not correct.
Also check your airbox/air filter to ensure it's sealed. If you allow dirt/sand through, you will get scratches.

At this point, I'd have the cylinder checked and rehoned and a new top end.

For what it's worth, my method of warming up prior to riding is to completely idle the bike until the cylinder itself is warm to the touch, then go ride. No blipping of the throttle or anything. Perhaps that's a bit extreme, but I've never had anything like that happen.
Some people wait until the wide part of the pipe is warm to the touch. I don't like that because the cylinder wall is thicker and will take a bit longer to get to temp.

good luck.
final touch wrote:
Thanks for your reply I don’t the cylinder had been touched before and is all original don’t no if it’s possible to tell by the pictures...
Thanks for your reply I don’t the cylinder had been touched before and is all original don’t no if it’s possible to tell by the pictures ?i did take it to a local engineer to get it honed but he said because it’s nikasil they can’t be honed and to just clean it up with a scotch brite ?

I will get a new piston ordered de glaze and scotch the cylinder and from now on warm it up the way you suggested thanks 👍
I believe this is the stick size piston
danman
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danman 8/12/2019 7:28am
8/12/2019 7:28am
danman wrote:
The first pic shows wear on the power valve, which means one of two things. 1) You aren't warming it up enough 2) The piston is...
The first pic shows wear on the power valve, which means one of two things. 1) You aren't warming it up enough 2) The piston is way too tight/bore is not correct.
Also check your airbox/air filter to ensure it's sealed. If you allow dirt/sand through, you will get scratches.

At this point, I'd have the cylinder checked and rehoned and a new top end.

For what it's worth, my method of warming up prior to riding is to completely idle the bike until the cylinder itself is warm to the touch, then go ride. No blipping of the throttle or anything. Perhaps that's a bit extreme, but I've never had anything like that happen.
Some people wait until the wide part of the pipe is warm to the touch. I don't like that because the cylinder wall is thicker and will take a bit longer to get to temp.

good luck.
final touch wrote:
Thanks for your reply I don’t the cylinder had been touched before and is all original don’t no if it’s possible to tell by the pictures...
Thanks for your reply I don’t the cylinder had been touched before and is all original don’t no if it’s possible to tell by the pictures ?i did take it to a local engineer to get it honed but he said because it’s nikasil they can’t be honed and to just clean it up with a scotch brite ?

I will get a new piston ordered de glaze and scotch the cylinder and from now on warm it up the way you suggested thanks 👍
Scotch brite will be fine as long as the nikasil coating is still in good shape.
I don't know Husky's that much, but with some manufacturers, they have multiple cylinders and tag them like and A or B cylinder. The difference is the bore size. If yours has had a top end, It's possible you have the smaller bore, but put the larger piston in. This shouldn't cause too many problems as the difference is very little, but if you don't warm it up, it would increase the likelyhood of a cold seizure.
Like I said though, I don't know if Husky has the same setup with cylinder bores.

DynoDan22
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DynoDan22 8/12/2019 7:38am
8/12/2019 7:38am
That is a Size 2 piston which is the larger size of the pistons available. The fact that you have scoring on the powervalve makes me think that you do not have enough piston to cylinder clearance.
final touch 8/12/2019 8:57am
8/12/2019 8:57am
Couple of measurements I’ve got from the piston along with a 53.96
Bruce372
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Bruce372 8/12/2019 12:39pm
8/12/2019 12:39pm
Pistons aren't round or straight so those measurements dont mean much
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