TZR250 2MA piston rings
Moderator: rztom
TZR250 2MA piston rings
Ordered a set of std rings for my 500 and instead of 47x1161000 being delivered, ive had 2MAxxxxxx been sent instead, can these be used on my original pistons?
The bike has only covered around 900 miles so I do not wish to change the complete piston.
Thanks.
The bike has only covered around 900 miles so I do not wish to change the complete piston.
Thanks.
- Rick Lance
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Re: TZR250 2MA piston rings
Nope. They're incompatible. If you only have 900 miles on the original parts, why change them?
If I disagree with everyone, that doesn't make me right. If I take the side of only one, it doesn't end the fight. If my position's strong enough from exposure to the light, you may see things my way when we share the same highway.
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Re: TZR250 2MA piston rings
Why are they incompatible? Same bore size, same clearances, pistons are interchangeable.
Re: TZR250 2MA piston rings
Thanks , id assumed by the difference in part numbers there must be a difference.
Re: TZR250 2MA piston rings
Hi think it is to do with the top locating pin different position
Cheers Ron.
Cheers Ron.
- Speed Freak
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Re: TZR250 2MA piston rings
I`m wondering a bit why you get 2MA pats... The 47x1161000 (standard size) ring set is still available according to 2 different sources.
Here you have the comparison between TZR piston and ring set which is replacing the 47X parts and the standard front pistons:
viewtopic.php?f=3&t=11544&start=15" onclick="window.open(this.href);return false;
But the set doesn`t include 2MA rings, they are 3XC.
I think the standard TZR pistons had the same locating pin configuration as the RD500 but sometimes they were not correct in place and the rings started to rotate.
What you get as set is already the improved variant (2YK piston) which is also described in a document for all Yamaha dealers.
Here you have the comparison between TZR piston and ring set which is replacing the 47X parts and the standard front pistons:
viewtopic.php?f=3&t=11544&start=15" onclick="window.open(this.href);return false;
But the set doesn`t include 2MA rings, they are 3XC.
I think the standard TZR pistons had the same locating pin configuration as the RD500 but sometimes they were not correct in place and the rings started to rotate.
What you get as set is already the improved variant (2YK piston) which is also described in a document for all Yamaha dealers.
My bikes:
RD500 YPVS 1GE
RD350 YPVS 31K 1985
Honda CBR 1000 RR SC57
Yamaha R1 RN04
RD500 YPVS 1GE
RD350 YPVS 31K 1985
Honda CBR 1000 RR SC57
Yamaha R1 RN04
Re: TZR250 2MA piston rings
Hi top piston is a 2ma bottom 47x. The left ring is a 3xc fits the 2ma the next ring fits the 47x,
so long as the top ring matches the bottom should be ok.
Cheers Ron
so long as the top ring matches the bottom should be ok.
Cheers Ron
- Speed Freak
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Re: TZR250 2MA piston rings
The top ring is a "new style" 2YK piston which needs 3XC rings.
According to the parts manual factory piston was "1KT" with "2MA" rings.
The 1KT piston used the same locating pin type as the 47X piston => The 2MA rings could fit to the 47X piston.
Even more funny... The original 2MA rings (2MA-11610-00) are superseded by... 47x1161000
You got it the other way around.
But if a part is superseded by another it means they are interchangeable.
According to the parts manual factory piston was "1KT" with "2MA" rings.
The 1KT piston used the same locating pin type as the 47X piston => The 2MA rings could fit to the 47X piston.
Even more funny... The original 2MA rings (2MA-11610-00) are superseded by... 47x1161000
You got it the other way around.
But if a part is superseded by another it means they are interchangeable.
My bikes:
RD500 YPVS 1GE
RD350 YPVS 31K 1985
Honda CBR 1000 RR SC57
Yamaha R1 RN04
RD500 YPVS 1GE
RD350 YPVS 31K 1985
Honda CBR 1000 RR SC57
Yamaha R1 RN04
Re: TZR250 2MA piston rings
As Michael said, 2MA rings are superseded by 47X.
So they are fully compatible.
So they are fully compatible.
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Re: TZR250 2MA piston rings
Having rebuilt few TZR engines recently, I will confirm that.
https://www.cmsnl.com/products/47x11610 ... ma1161000/" onclick="window.open(this.href);return false;
https://www.cmsnl.com/products/47x11610 ... ma1161000/" onclick="window.open(this.href);return false;