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Murray's 4 into 2 Carb kit

Is it possible to outperform stock? Yes. Is it likely? Nope.

Why do people bother with bodges like this when the OEM system works just fine?


Mark
 
In my inexperienced opinion, I doubt performance would be improved. Those intake manifolds aren't a smooth radius. Also, I highly doubt you'd get any gains for that $600 spent. I'd spend that money on many other things before I spent it on that.
 
On my 650, the manual wants the two inner carbs synched to a slightly lower vacuum so two carbs wouldn't work if this matters...That said, some 550s(?) came with two carbs, I think.
 
Hi everyone, interesting topic. Yes, some years gs550's came with dual two barrel carbs. The Murray system has dual single barrel carbs with two y shaped aluminum manifolds. They sell many kits for gs550, cb750, gs1100,xs1100 ect. The mikuni vm34 's are cheap to buy on ebay , about 200 usd for a new pair which is less than I can buy a single carb for my mx bike. I think that's the only way he can sell those kits at that price, those hand made manifolds must be worth about 400 a set. For the bigger bikes, these kits don't seem to make much sense because you can buy a set of mikuni rs36's for a little more than a 100 dollars more. From what I understand, there are no new carb options for gs550/650, so maybe this system is worth a second look for people that want new carbs. I don't think someone would go to all that trouble making manifolds if the bikes ran like crap. The system is very simple, but you would have to watch for throttle cable stretch to keep the carbs in sync. Perhaps a check on the cafe racer forums would get more info.
 
Unless you are trying to resurrect a barn find that did not have any carbs with it, there is seldom a need to buy 'new' carbs. Usually, there is a decent selection of used sets on eBay or other sources. Yes, most of them will need to be 'rebuilt', but rebuilding a set of carbs is pretty much standard operating procedure, anyway, so it's nothing unusual.

Also, unless you have some special 'need', like all-out racing or you need a 'special look', the stock carbs work well and do not require any re-engineering. That makes the expense of the manifolds and the carbs to match them seem rather unnecessary.

.
 
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