I'm a newer member to this site and I've read and learned a lot. I've owned ATV's and worked on them since I was a kid. I have come across something rebuilding my new R that I've never seen before. It appears to be a sleeve inside a sleeve. I've never even heard of this let alone seen something like this before. I'm hopeing with all the combined knowledge this site has someone can shed some light on this for me. 1 is it safe and 2 were they just trying to get to stock bore without buy a new sleeve? It measures 66.5 mm. Here are some pics I took
Sleeve inside of a sleeve?
2 reading
Darrell45710
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I'm a newer member to this site and I've read and learned a lot. I've owned ATV's and worked on them since I was a kid. I have come across something rebuilding my new R that I've never seen before. It appears to be a sleeve inside a sleeve. I've never even heard of this let alone seen something like this before. I'm hopeing with all the combined knowledge this site has someone can shed some light on this for me. 1 is it safe and 2 were they just trying to get to stock bore without buy a new sleeve? It measures 66.5 mm. Here are some pics I took
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Cylinder sleeve inception!
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First thing that comes in mind is heat transfer problems
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That was my first thought too, but I've rode on this cylinder for about 3 months. Never had a overheating problem. Or anything. Only reason I found this is because it needed rings. What blows my mind is the jug is ported and polished so why not just put a new sleeve in it instead of putting a sleeve in a sleeve. I know it's not going back on now because there is no way I'll be able to trust it
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Thanks Jason
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When it comes to replacement sleeves for the OEM TRX cylinders, there three sizes offered.
#1, is the sleeve you are seeing in you cylinder.
This replacement sleeve, is to bring the cylinder bore back to the STD 66.00mm size, because max bore on that cylinder is 68.00mm. Although those year cylinders can be bored larger, by using the 85/86 year piston from 68.50mm & up & the use of a cylinder base spacer plate.
#2, is a real thick sleeve, used like when a sleeve skirt was broken off & the use of that thin sleeve like your seeing cant be installed. To use this sleeve, all of the remaining sleeve in the cylinder must be bored out to the proper I.D. so that the new thick sleeve can be installed.
This replacement sleeve, if one wanted to, it can be bored from a STD 66.00mm bore all the way up to the 295, 72.00mm. Last bore for this sleeve, 73.50mm.
#3, is a big bore 295cc sleeve, which is called the 310 sleeve. Same cylinder repair process as the real thick replacement sleeve.
What you have, was a big thing years ago, a short while after the 87 TRX250R came out, because the new model cylinder could only be bored out to 68mm. Then some of the custom builders came up with the base spacer plate idea so that the cylinder could be bored out to 69.50mm by using the old model 85/86 piston kits.
Neil
#1, is the sleeve you are seeing in you cylinder.
This replacement sleeve, is to bring the cylinder bore back to the STD 66.00mm size, because max bore on that cylinder is 68.00mm. Although those year cylinders can be bored larger, by using the 85/86 year piston from 68.50mm & up & the use of a cylinder base spacer plate.
#2, is a real thick sleeve, used like when a sleeve skirt was broken off & the use of that thin sleeve like your seeing cant be installed. To use this sleeve, all of the remaining sleeve in the cylinder must be bored out to the proper I.D. so that the new thick sleeve can be installed.
This replacement sleeve, if one wanted to, it can be bored from a STD 66.00mm bore all the way up to the 295, 72.00mm. Last bore for this sleeve, 73.50mm.
#3, is a big bore 295cc sleeve, which is called the 310 sleeve. Same cylinder repair process as the real thick replacement sleeve.
What you have, was a big thing years ago, a short while after the 87 TRX250R came out, because the new model cylinder could only be bored out to 68mm. Then some of the custom builders came up with the base spacer plate idea so that the cylinder could be bored out to 69.50mm by using the old model 85/86 piston kits.
Neil
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I've ran cylinders like this over the years and never had any problems with it..
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Thanks for the info Neil. As long as it's safe to run I can live with it. I was worried it was backyard mechanics fix
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13,288 Posts
The sleeve in a sleeve is an old idea, not seen anymore as it is not the best way to extend the life of your cylinder. Will it run, and will it run as good as if it was a new sleeve?; yes and no...if it's your 'play toy', you will be fine. For ultimate performance and reliabilty; you can do much better than a sleeve in a sleeve.
Carlos
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So you guys made it back home ok Carlos.
Neil
Neil
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