Hi !I happened to discover that there are two different pistons for the 485 cc FC Phazer engine.
What is it that distinguishes them in detail ?
Are they interchangeable ?
All sleds with TSS-chassi ( 1984 - 1999 ) , Yamaha part # 8V0-11631-00-00
All sleds with Pro Action chassi ( 1999 - 2004 ) , Yamaha part # 8DJ-11631-00-00
Even Wiseco have different part numbers...
A couple of bucks
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Yes, I'm aware of that test but it is from 1990
....long long time before Pro-Action chassi was built.
The modification that shows is a kind of Factory Modification on pistons for Race Engines,
not on stock Engines in consumer sleds.
I would like to know the differences between the two different OE made pistons.
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never really compared the 2 side by side, just took it for what its worth based on the engine changes for the 99-01 pz.
when you factor in the engine was completely changed in 99 including new crankcases to fit the new chassis, new crankshaft, new cylinders, and the oil pump relocated, different cylinder port timing, one can only reason that the pistons would have been changed as well.
if the opportunity arises in the future to where i can compare the 2, i will be sure and relay what i found.
when you factor in the engine was completely changed in 99 including new crankcases to fit the new chassis, new crankshaft, new cylinders, and the oil pump relocated, different cylinder port timing, one can only reason that the pistons would have been changed as well.
if the opportunity arises in the future to where i can compare the 2, i will be sure and relay what i found.
Thanx for your input Snowdad4
Tell some more about that different cylinder port timing thing !
The odd thing is that when you look att some other aftermarket pistons makers
they use the same part # for the "New" 485 pistons as well as the "Old" 485 pistons
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Throttle Junkie35
New member
I cant say for sure, but since some aftermarket suppliers list the same piston, Im going to guess the only difference is in the ring locating pins. I know this is the case with the Exciter and Exciter SX pistons. The aftermarket companies offer one piston for all years yet yamaha has 3 different pistons and part numbers, and the only difference is the position of the locating pins.
yamadogger01
New member
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- Jul 1, 2023
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Old thread but I'd like to add that the 8V0 and 8DJ pistons seem to be interchangeable.
I happened to discover that there are two different pistons for the 485 cc FC Phazer engine.
What is it that distinguishes them in detail ?
Are they interchangeable ?
All sleds with TSS-chassi ( 1984 - 1999 ) , Yamaha part # 8V0-11631-00-00
All sleds with Pro Action chassi ( 1999 - 2004 ) , Yamaha part # 8DJ-11631-00-00
Even Wiseco have different part numbers...
View attachment 59052
Here I am comparing an 8V0-11631-00-96 (stock 72.00mm piston) to a new 8DJ-11635-00 (72.25mm piston). They look completely the same and I also noticed that the 8DJ piston still got the "8V000" markings inside it, just like on the 8V0 pistons. The pins holding the piston rings in place are also the same distance apart.
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yamadogger01
New member
- Joined
- Jul 1, 2023
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I can also add that I have the 8DJ pistons installed in my 1989 Phazer right now and works perfectly.