Fe400 with 501cylinder?
- Thread starter Zeke
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- 501cylinder fe400
I have a fe400 with bad cylinder and camshaft.and i have 2 choice: a 400cylinder or a 501 cylinder.
Are the engine cases same?
Are the engine cases same?
Joined May 2005
190 Posts | 145+
Sacramento California
Doing the math, I believe that your 400 has a 92mm bore and 60mm stroke. Using a 501 cylinder with the accompanying 95mm bore would get you a 425. However, that 501 cylinder should be some 5mm or so taller than the 400 cylinder so, if you use the stock rod and a stock 501 piston, your piston will never get high enough in the bore to generate any reasonable compression. So, you'd likely need a 5mm longer rod as well. For the cheapest alternative, my guess would be to just bore the 400 cylinder from 92mm to 95mm and use a 501 piston, assuming they have the same compression height.
However, since you're boring things out, you might think about boring the 400 cylinder out to fit a 100mm piston from a newer 450, 470, 550, etc or, like I used to build my 660, a KTM 560 SMR piston. Your choice would probably be based on compression height differences among those pistons. A minor detail is that your cases would probably need to be bored as well to accommodate the sleeve necessary for a 100mm piston.
Just a few things to think about.
However, since you're boring things out, you might think about boring the 400 cylinder out to fit a 100mm piston from a newer 450, 470, 550, etc or, like I used to build my 660, a KTM 560 SMR piston. Your choice would probably be based on compression height differences among those pistons. A minor detail is that your cases would probably need to be bored as well to accommodate the sleeve necessary for a 100mm piston.
Just a few things to think about.
Joined Nov 2001
17K Posts | 774+
Ely, England
the 400 has a 5mm longer rod than the 501 Thorgan!
its also a deeper subject than the one you describe. the 426 is considered by many as a 'beauty'. I did it years ago for 'UNO' Rogstad of Norway and he thought the bike a beauty. he put the 501 head on as well and did many miles on it (or is that Kilometres....or is that kilometers or is that....).
Luckily the early 501 was a 92mm bore with a 20mm little end so it goes straight in. however have a good look at your little end as the bush must be worn out by now. I sell the very rare bush 20-22-18.
I wouldn't go any bigger, the 470 later on was a phuqing animal and whereas the 'septics' might like more and more I think anything over 95mm is too much. the barrel will take it.
Also try to go to 32.5mm inlets from guess who and convert to DVSK (from .....). just mildly get someone to port the head, well mainly the exhaust ports, just rip it out. later, look for the 501 headers which funnily enough I have here brand new!!!!!!!
change to sealed cam bearings. get a steel sprocket, grind the shoulder off the cam and fit the later auto decomp.
nice bike.....
Taffy
its also a deeper subject than the one you describe. the 426 is considered by many as a 'beauty'. I did it years ago for 'UNO' Rogstad of Norway and he thought the bike a beauty. he put the 501 head on as well and did many miles on it (or is that Kilometres....or is that kilometers or is that....).
Luckily the early 501 was a 92mm bore with a 20mm little end so it goes straight in. however have a good look at your little end as the bush must be worn out by now. I sell the very rare bush 20-22-18.
I wouldn't go any bigger, the 470 later on was a phuqing animal and whereas the 'septics' might like more and more I think anything over 95mm is too much. the barrel will take it.
Also try to go to 32.5mm inlets from guess who and convert to DVSK (from .....). just mildly get someone to port the head, well mainly the exhaust ports, just rip it out. later, look for the 501 headers which funnily enough I have here brand new!!!!!!!
change to sealed cam bearings. get a steel sprocket, grind the shoulder off the cam and fit the later auto decomp.
nice bike.....
Taffy
Thanks for all the tips: Taffy and Thorgan.
Taffy I have been on your site and droul
Taffy I have been on your site and droul
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