I think you have a misunderstanding about how engines work, or else I am misunderstanding what you are saying. Valve size and timing affect the opening, which can allow more air in, but increasing cylinder volume pulls more air through the same opening. Said another way, if you increased your lung size, but not your mouth/throat you could still breath more air, right? The pump is bigger even if the hose isn't it will flow more unless you are right at the limit, which you are not with the stock head. I had to add more fuel because I was pumping more air, simple as that. Sure with head-work, it may be able to do even more yet, but that is true at 501cc (and 450cc) too. I think the cost of the piston is roughly the same... the kit costs about 2x as much as just a piston but you are getting another cylinder too.
yeah, I was thinking a bit too theoretically about that valve opening time/size, and I guess it's worth the shot whenever I need a rebuild. Thanks!
Anymore updates on the kit on a 450? I am thinking of tossing it on my carbed 08 smr. What is the actual displacement on a 450? Does anyone has side by side numbers of the stock 450 and with a 530 kit on a 450. I'm on the fence about just putting kit on my 450, or making it an actual 530 by getting a crank, cylinder studs, cam chain. Would be nice to have a dyno chart of all four bikes. 450, 478, 510, 530
Discussed in some detail in this thread: http://www.cafehusky.com/threads/530-big-bore-kit-installed.12593/ No idea if anyone has done it... JR raises an interesting point in post #80 of the above thread about only milling off 1/2 the difference. Someone just take the plunge! It can SURELY be done, and when you have the new 530 long stroke jug in hand you can compare dimensions to your 450cc and it will be easy to see how much needs milled and where so that everything works. I sold my Husky to a friend so that I could focus on my Aprilia SXV, and man do I ever miss the simplicity of the Husky thumper. The SMR with the 530cc kit is only a taller-6th-gear away from being the absolute perfect Supermoto bike for all around riding, performance, and reliability.
Yup, The difference in stroke is 7.04mm. Since only half of that is upward movement, The cylinder needs to be milled just 3.52mm or 0.1385in.
...............................................530 aayy...................time to start hunting down a smr510 crank......
