Yamaha R1 carburetor - Alfa Romeo Forum
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(Post Link) post #1 of 8 Old 03-07-11 Thread Starter
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Yamaha R1 carburetor

Hi LAds,

Told a fellow Alfa owner I'm looking to rebuild a 33 1.7 8v engine on carbs, dellortos to be exact but he recommended to use Yamaha R1 carbs instead, does this make sense or haave you heard of anybody doing this before? If so whats the difference? He reckons once they have been balanced once thats it, they dont have to be rebalanced every so often!
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The R1 uses horizontal flow carbs instead of vertical flow required on boxers.
Apart from the flow direction the R1 carbs are designed for in-line engine,
i think it would be a pain in the @ss to make a correct throttle linkage between
the left and right cylinder bank for these carbs in order to operate the
throttle valves in sync.

IMHO it's a more lucky thing to use these carbs for an in-line engine.
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Aren't R1 carbs too small? My Fazer 1000 (detuned R1 engine) has what look like 32mm sidedraft carbs.
Have a look at a Honda Gold Wing. They had 1200cc carb fed flat 4 engines for a while
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Actually the R1 uses Mikuni BDSR40 CV Downdraft carbs so yeah, you could use it in a boxer (although correct installation is in a bit of an angle), but i don't see a point in doing so. Though they are individual units, it would be a pita to modify the stock bar to operate them, and an even bigger one to fabricate a new linkage from scratch. Plus, you must fabricate some sort of inlet manifold to fit them. And there's no such thing as adjusting a carb only once...
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As above, total waste of time and effort. I havent adjusted the balance on my carbs(Dellorto DRLA)for a few years now - i recently checked the balance with the tester and they were still pretty spot on.
Stick with what its supposed to have - Dellorto's or Weber's.
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(Post Link) post #6 of 8 Old 05-07-11 Thread Starter
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dellortos it is so
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I may have a pair of Dellorto 40's coming avaliable in a few weeks time, spare mains and idles included.

I'll place them in classified section towards the end of July.
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Aye! Why bother when there must be so many Dellorto's aroond? Gronk! Gronk!!

Even if you can get them fitted (you'll need a manifold and throttle linkages) .. there's no way that the jetting will just work. You'll need to do a lot of experimenting with different jets before you get a clean throttle response, steady idle and good bhp out of it. A ready-fit doodah is what you want.
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