Hey I have a 96 rm 125 and it needs a top end. The rings say n-100 and the piston is stamped 2488a. I can't read the numbers in the middle except the first two are g4 and the two are 0a. Any ideas???
Rm 125 what bore/piston is this
- Thread starter gladeslife
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No I don't. I'm in south Florida and everywhere around here are a rip off. Does anyone know somewhere I could ship the head to get bored or honed
So first I don't know where the best place would be to ship it but I believe your talking about cylinder honing, not head work which really isn't done on a cylinder like yours as it is a plated cylinder and needs to be replated, instead of honed or bored, you also should be looking for around 250- 275$ if you send in a stripped down cylinder. and I mean stripped, no studs , vents, power valve parts, cause they'll charge ya extra. hopefully you'll find someone to take care of ya though.
Calipers are cheap. Under 30 dollars for ones that are digital and read out to 6 inches. Every auto parts chain Sells them.
Honing the plated cylinder is quite common. Like the calipers the hone is pretty reasonable. You can do a decent job of measuring the wear on the bore by moving the ring down the bore as you measure (and do the math). You can keep the ring pretty sq in the bore with the piston.
Honing the plated cylinder is quite common. Like the calipers the hone is pretty reasonable. You can do a decent job of measuring the wear on the bore by moving the ring down the bore as you measure (and do the math). You can keep the ring pretty sq in the bore with the piston.
http://t.harborfreight.com/hand-tools/measuring-tools/6-inch-composite-digital-caliper-93293.html
This the one I used. They did an awesome job on my cylinder for like 220.
http://www.mt-llc.com/pricing.php
I have good things about this company too
http://www.powersealusa.com/prices/
This the one I used. They did an awesome job on my cylinder for like 220.
http://www.mt-llc.com/pricing.php
I have good things about this company too
http://www.powersealusa.com/prices/
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I ordered some calipers. Any idea on what specs will need what rings? I guess I'll measure the piston and then the cylinder and report back.
Yes, first measure your cylinder. if it is in good shape plating wise and in spec bore wise then you're good to go there. Slide a ring up and down the cylinder using a filler gauge to measure ring gap. Your manual will tell you where your specs should be. If you don't have a manual. You'll need one pronto like
I'm hoping that the cylinder is in spec and I can just install a new piston and rings and ride
I just realized the calipers I ordered are in china so I'm trying to cancel the order and get one from harbor freight. Let you know the specs of the cylinder. Thank you!
Well I went to harbor freight and measured the top and bottom of the cylinder. 
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. . .You can measure the cylinder with caliper to determine the bore but not if it is in spec. Like I said and Ossagp said you'll need a set of rings and filler gauge to measure for spec. just measure ring gap. your manual should tell you what the ring gap tolerance should be.
If you don't have a manual you can place the ring at the top of the bore or as I like to, right where the transfer area openings end. Square it up with the piston, and measure the end gap. Slide the ring down the bore using the piston. Keep measuring until you get the widest ring gap. Remember the formula for figuring circumferences. See how much wear you have in comparison to the virtually unworn part of the cylinder. Decide to plate or not based on that and the condition of the plating above the exhaust port(s) and transfers.