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It’s been stated that the stihl 046/460 has had more jug variations than any other model line. I’ll beg to differ that the 1121 line varies even more.
I’ve held over 100 in my hand. I’ll show the 4 main types I’ve found. Every now and again, I find one that’s totally different.
Not shown is the 44mm KS 1121 jug. As usual, it’s a shinier cleaner looking alloy and has “Stihl” and “1121” cast into the Top of the jug. As opposed to other models, these run ok, but are not as good as their Mahle counterparts. They are difficult to machine, have worse timing numbers, and jagged plating where the bore and band meet. They are generally found in late model plastic badge 026, just before the change to MS260.
Most MS260 are indeed 44mm and not 44.7. If the saw is marked as 50cc on the handle sticker, has a heat shield between the muff and exhaust, and is original, it’s most likely a 44.7.
I’ve found little difference in the numbers between the 2 sizes. They both can generally have .062 taken from the band before they Freeport.
For those of you that think a 44.7 piston will have a wider skirt enabling a bigger port, think again. The skirts are exactly the same width, even with the bigger bore. So then one can safely go wider with the port to 65% of bore with the bigger jug? Wrong again, the skirt width allows around 63% bore on the 44mm, and even less on the 44.7.
The only accurate way to know which bore you have is with a measuring device. But I’ll try to illustrate some visual clues for you gents.
I’ve held over 100 in my hand. I’ll show the 4 main types I’ve found. Every now and again, I find one that’s totally different.
Not shown is the 44mm KS 1121 jug. As usual, it’s a shinier cleaner looking alloy and has “Stihl” and “1121” cast into the Top of the jug. As opposed to other models, these run ok, but are not as good as their Mahle counterparts. They are difficult to machine, have worse timing numbers, and jagged plating where the bore and band meet. They are generally found in late model plastic badge 026, just before the change to MS260.
Most MS260 are indeed 44mm and not 44.7. If the saw is marked as 50cc on the handle sticker, has a heat shield between the muff and exhaust, and is original, it’s most likely a 44.7.
I’ve found little difference in the numbers between the 2 sizes. They both can generally have .062 taken from the band before they Freeport.
For those of you that think a 44.7 piston will have a wider skirt enabling a bigger port, think again. The skirts are exactly the same width, even with the bigger bore. So then one can safely go wider with the port to 65% of bore with the bigger jug? Wrong again, the skirt width allows around 63% bore on the 44mm, and even less on the 44.7.
The only accurate way to know which bore you have is with a measuring device. But I’ll try to illustrate some visual clues for you gents.
