250-500cc Small Pinholes in cylinder and head

Please check the picture and give me you opinion. Also I have 4 small holes like this in the nikasil of the cylinder. I clean, lube and grease the air filter after each ride.

Thanks,

they could be a number of things including preignition

that is common in all 2t.

I run across differing levels of pits/voids in the Husky castings and this is pretty typical of all 2T's. I have certainly seen worse and also better.

Thanks you guys for your update. I am more reassured

If the Nikasil is coming off the cylinder then it can make pits like that in the head. Have the pits in the head been there before, or are they new?

If they are new and you have spots in the cylinder developing, you should probably have the cylinder re-plated.

Looks like typical casting porosities....

Shoot, I wish my 300 head looked like that. After my engine failure last summer, it went from looking perfect 10 hrs previously on new top end install, to being completely covered in scarring like that. Of course my cylinder came all apart, as did the piston and powervalve.

I don't know if it was like that when I bought the bike, it's the first time that I open the top. For sure I will watch this seriously during the season.

Something you need to keep an eye on. As they have all said, some is not uncommon. I've machined hundreds of heads, and from the pictures that looks more like something got eaten buy your engine to me.

I guess my cup is half empty and theirs are half full.

And now what do you think about it Can run the bike like this or I need to rebuilt the top end?

Yeah, it looks like you lost some plating. That's what made the pits in the head.

I'm afraid I'd have to have it re-plated.

I don't want repeat the same thing this season. According to you, what happened? Overheat, warm-up, air leak?

Thanks for you help,

Honestly, I don't know for sure. I have seen this intake side seizer like condition on a number of 300's and I'm not entirely sure what the problem is.