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I need help on my top end rebuild 125sx
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Posted: 10/28/09
07:24 AM
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How do I know what size bore to get for my 03 125sx ? This is its first top end rebuild the bike will get, its in rough shape, not sure what else I should do to get it in good shape to ride/ race next season. Please help me.
-Jessica
GO BIG OR GO HOME
Jessica XOXO
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Posted: 10/28/09
07:55 AM
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If the bore is in rough shape you'll need to have the bore replated with the stock-type Nikasil coating. There are a variety of companies that offer that service. Look at the ads in the back Dirt Rider for a company in your area. You can also have the cylinder sleeved with a steel sleeve, but the KTM was designed for a plated bore. If you do decide on a sleeve, LA Sleeve is a great source.
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Posted: 10/28/09
08:16 AM
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The cylinder walls are fine I don't think it needs to be re-sleeved, however the bike itself is a little rough around the edges (any maintenance suggestions for a bike that has been sitting and poorly maintained? things I should look for or be aware of?). Im just not sure how to tell what size bore I have and which top end rebuild kit is suitable for my bike.
GO BIG OR GO HOME
Jessica XOXO
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Posted: 10/28/09
08:25 AM
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You will just need to order a standard bore kit for an 03 125sx. Or are you referring to whether or not it's an A or B cylinder?
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Stand in the place where you are, think about direction and wonder why you haven't
North Carolina
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Posted: 10/28/09
08:46 AM
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Yeah I'm not sure if its an A or B, I'm not sure how to tell what size
GO BIG OR GO HOME
Jessica XOXO
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kbaird83
Guru
| Posts: 1628
| Joined: 01/09
Posted: 10/28/09
11:15 AM
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if your doing the top end you might as well have the cyliner honed (20-30 bucks) just take it in to your local dealership and when they hone it have them measure the bore and order the correct piston right there. they will usually do this extra stuff for free. that way if your cylinder is out of spec they can order the correct piston/ ring combo to make the best fit. get the cylinder, piston, rings and everything back at the same time and your ready to go. plus you know everything will fit right. pays to take it safe dont want to have more problems down the road.
-Kirk 88 Honda CR250R
ride hard and crash harder
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kbaird83
Guru
| Posts: 1628
| Joined: 01/09
Posted: 10/28/09
11:17 AM
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ask around to people who ride in your area to find the best most honest dealer around. there is only one dealership around here i wouldnt trust the other 5-6 i would believe in a heart beat.
-Kirk 88 Honda CR250R
ride hard and crash harder
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Posted: 10/29/09
03:50 AM
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i have a trusted machine shop, however the dealerships in my area aren't the greatest not to mention expensive. im trying to avoid spending a lot of money at the dealership when i can hone it myself (re-sleeving is another story), im trying to find out how to measure the bore thats why im on the forum seeing if anyone might know. i have a dial caliper to measure it but how do i know what size piston to get vs how much space to allow
GO BIG OR GO HOME
Jessica XOXO
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Posted: 10/29/09
09:51 AM
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usually u run around 2-3-4 thousands but wiseco likes em to fit a little loose
RIP old dirtrider
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Posted: 10/29/09
10:00 AM
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 Maple Leaf MX:
usually u run around 2-3-4 thousands but wiseco likes em to fit a little loose
racing shopping carts in the wal mart parking lot does not qualify you for a tech thread. 
^*^*^*^*^*^*^*^*^*^*^*^*^*^*
Stand in the place where you are, think about direction and wonder why you haven't
North Carolina
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Posted: 10/29/09
04:56 PM
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DOH! DUNK SLAM! sry sheriff
RIP old dirtrider
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Posted: 10/30/09
04:18 PM
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Ha ha thank you 
GO BIG OR GO HOME
Jessica XOXO
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Posted: 10/30/09
08:48 PM
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no problem crudly chudly jus gets a lil excited sumtimes
RIP old dirtrider
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