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250 mil I believe...
190cc on sx50 jr 210cc on 50sx sr (02-09) on both
No compression means time for a rebuild.
125-130 lbs
12.0:1
11.0:1
Not an easy question to answer. Compression readings are greatly impacted by your gauge, altitude, air density etc. I have seen many places where the compression on a KTM 65 should be at least 135PSI. I live at 7,000 feet, I purchased a cheap Harbor Freight compression gauge. I tested compression on 2 new KTM 65s and 2 Cobra 50s. The KTMs read between 88 and 95 PSI, the Cobras read between 60 and 65 psi. All the bikes run great and have plenty of power. I know my gauge reads low, I also had to use an adapter to fit the gauge on the cylinder head. From what I understand the adaptor also adversely impacts readings. I think the best bet calls for measuring compression when the engine is new, record the PSI, date temperature, elevation and gauge used as a benchmark. Check the compression again at intervals, when compression drops by more than 10% from the benchmark consider a rebuild. When compression drops by more than 20% rebuild is imminent.
2 Wheel Tuesday - 2003 Mike Lafferty Factory KTM 1-1 was released on: USA: August 2003
lots: kowasaki: kx65, kx85 kx100, kx250. yamaha: pw50, yz85, yz125, yz250. ktm: 50sx, 65sx, 85sx, 105sx, 125sx, 150sx, 250sx, 320sx. suzuki: jr50, jr80, rm65, rm85, rm125, rm250 honda: cr85, cr125, cr250 and much more
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2009 KTM 250SX retail price $6598