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Old 04-13-2014, 07:28 AM   #1
JMGreen OP
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F7 Project

Just bought a project F7 for $150. It failed compression test, 25lbs was the best I got. Does anyone know of where I can get a top end kit. I have checked bike bandit. They have kits but the year models do not match up. Will a 1978 kit fit a 73? I will have many more questions and pictures hopefully as I progress through the project. Any information is greatly appreciated you know about these old kawasakis would be great too.

Thanks
Jake


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Old 04-13-2014, 11:29 AM   #2
Racer111v
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A quick check on Ebay shows several new pistons/rings/gaskets.
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Old 04-13-2014, 06:11 PM   #3
JMGreen OP
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I looked and found many kits. I am concerned about the piston matching correctly. So how do I find the part number to match up with the kits on eBay?


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Old 04-13-2014, 06:42 PM   #4
Racer111v
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They list the oem part numbers here. http://www.motosport.com/dirtbike/oe...%28%2771_%2773 Wiseco part numbers may be a little tougher. I have only had some luck dealing with Wiseco on old part numbers.

You will need to find out ,by measuring the cylinder, what size piston it will need. Low compression may just be stuck rings or a junk piston/cylinder. Take it apart and see...........
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2004 KTM 950 ADV ...............................1979 Suzuki RM400 VMX Race bike
2006 DR-Z400E plated........................... 2001 Ducati ST2 944
2001 YZ250N 2T soon to be plated.......... 1986 Yamaha FJ1200
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Old 04-13-2014, 06:51 PM   #5
JMGreen OP
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Piston is completely junked. It was burned all the way to the first ring. Sending the cylinder and piston to shop tomorrow to get it honed and piston measured. Thanks for the help btw.


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Old 04-13-2014, 06:59 PM   #6
Racer111v
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Be sure you find out why it happened. Timing?, wrong plug, leaking crank seals, bad rotary valve, etc... I owned on of these as a kid, and it was unbreakable. The rubber gasket that sealed the carb was the biggest leaker. It would fill the carb with silt if it went underwater.
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2004 KTM 950 ADV ...............................1979 Suzuki RM400 VMX Race bike
2006 DR-Z400E plated........................... 2001 Ducati ST2 944
2001 YZ250N 2T soon to be plated.......... 1986 Yamaha FJ1200
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Old 04-13-2014, 08:16 PM   #7
JMGreen OP
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It turned over freely when I got it, and put gas straight into the cylinder. It would somewhat run as long as I pushed it along. So hopefully timing is not a problem, but I am a novice at these engines so timing may be off and I do not know it. The guy I got it from did not know and never worked on it. I have found a piston through wiseco. Do those come as a complete set, with rings and all?
I know it needs a new piston, so now to start on what I don't know. How to check rotary valve? Then crank seals?


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Old 04-14-2014, 05:33 PM   #8
JMGreen OP
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There is a decent picture of the bike.


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Old 04-18-2014, 12:20 PM   #9
King_Troll68
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Rice patty

http://ricepaddy.com/
I picked up some gasket for my f9 350 bighorn a few years ago
you can try them.
Also i picked up an over sized piston on eBay, the machining for the cylinder was done locally.
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