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Możesz odpowiedzieć na tę wiadomość w swoich wiadomościach (http://www.youtube.com/attribution_link?a=lXCJ3sNyWJM&u=/messages%3Ftab%3Dsent). |
I convert all my 638 engines to the unrestricted 34 HP pre-1988 status. The early 638-0 engines had cast gear fork selectors, which break so Motokov would fix them for free. There was a dealer service recall here in the UK on the 1986 638-0. A friend Timbo has two examples of the 34 HP 1986 638-0, along with 1990's 632 and 638 models plus a 1978 CZ 250 471-2. He did own a 1974 CZ 250 471-0-Aprillia, which was built in Italy but gave it away after it had completed 82,000 miles to a collector. The 1987 KS 350, of which I have one in pieces because the previous owner stupidly ran the engine on 40:1 oil mixture and oil starved the crankshaft bearings, is the same bike except with plastic bodywork.as (http://bodywork.as/) with later models. The engine is still 34 HP with the yellow band rev counter and 7,000 RPM redline. The difference in later 1988, 1990's and 2000's bikes is as follows: On 34 HP engines the piston openings are 25mm. wider so that all 4 scavenge ports are open when the piston is at the bottom of its stroke. On later engines only 2 are opened completely. The exhaust silencer body is longer by 70 to 80cm. On later 23 HP models the baffle has an additional restrictor collar welded on so that the engine choke on its own exhaust gasses at full throttle. I have pictures of this baffle in restricted and unrestricted versions. I ran internally modified CZ 250 / 350 exhausts on my 1987 638-0 KS 350 as they looked and ran better. My E-mail is panzergranate@hotmail.com if you want the pictures. Some bike pictures old photograph types and I'll have to digitalise them. A friend took the only picture of my 1978 CZ 250 - 638-0 cafe racer at the 1992 annual Jawa CZ owners Club rally at Boston in Lincolnshire. I still have the remains of the bike and the engine is sat on a shelf waiting for me to change the worn out output drive bearing and repair the 4th gear selector it killed. It has 60,000 kilometres on the clock. I have owned a lot of Jawa and CZ bikes since 1980, most of which I still have awaiting repair. I rotate the use of my bike over the years. Current must do something about are replacing the crank bearings on a 1977 CZ 350 472-1 engine and rebuilding a 79,000 mile Aprillia built CZ 350 engine I've had sat on a shelf since 1991. I bought the new Asso Werke pistons for it in 2004 and so far I've managed to move the engine from the shelf to the workbench. The dynamo rotor is stuck on and I'm going to have to cut it off, which is why it has sat on a shelf for so long. If you hear the expression, "Rebuilding to Aprillia specification", when refering to a JAWA or CZ engine, it simply means copying the way Aprillia built its CZ engines in the early 1970's by using Italian and Japanese parts. This means: Japanese Koyo low friction bearings. Asso Werke high compression pistons. 20mm. x 20mm. caged needle roller piston bearings. The Aprillia CZ 250 had a top speed of 140 to 150 KMH. The Aprillia CZ 350 had a top speed of 160 to 170 KMH. The engines sound so different to Czech versions. Tickover is evil sounding and lumpy. Throttle response is very fast. On the downside the Aprillia CZ 350 destroys clutch plates unless Suzuki GSX 750 R springs are fitted. The standard springs last 6 months and clutch plates 3 months is ridden 30 to 40 kilometres everyday. It also destroys the chain adjuster, front engine mounts and a few other things that are fine on ordinary Czech CZ 350 bikes. However beating a Yamaha RD 250 LC or Suzuki X7 off of the lights and pulling ahead on a CZ makes all the hastles so worth it.....
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