mikuni R1 carbs spaced to fit, modified linkage ,original yamaha couplings , aluminium joined with durafix system , pipes angled to fit float bowls level heres the manifold fitted, i'll have to shorten the runners as they are too high
Any shots of inside the runners and who are you getting to jet them? Looking at doing a similar thing myself.
The runners are od 45mm with a wall thickness of 2.5mm, so id of 40, exactly the same as the carb. As for the jetting i'm going to fit 1.8mm main jet and go from there, i have a wideband lambda to fit so tuning in to the best setting is not to difficult.
jamez 1.8mm might be a bit to big, mine are 1.75mm and still a little to big. i know we are running similar spec engine so maybe start with a 1.7 and keep drilling them out half a mm bigger at a time? should be easier to tune with the wideband kit to!
the original mounting angle as fitted to the R1 was 75 deg. It is possible to mount the carbs at a lower angle , i was aiming to get the float bowls level but estimated the lean angle on the head to be 20 deg. but it is more hence the angle , but this is closer to the original position and after all if this is how mikuni designed the carbs to be then who am i to argue??
looking at the above head cutaway your carbs look to be sitting at far to high an angle for a direct flow, but hey, maybe im wrong. edit, just looking again you mention 75degrees, this is far too steep regardless how they were fixed in there original position. its nothing to do with how they were or how they look, its all down to the head your bolting them to.
the angle of the carbs look good to me r1 s when on the bike are downdrafts and should be a a steep handle people don't realize this...good job dude
Jesus Christ, if you mount the carbs reguardless of their float bowl angle you won`t get correct fuel metering or fuel level in the carbs. He`s done the right thing by mounting the carbs at the same angle they were intended to be run at, the fuel level/ float angle will be correct. It doesn`t make a **** of difference to fuel injected throttle bodies what angle they are mounted for fuel metering so that`s a null point anyway. Don`t think anybody`s bothered to read his reasoning behind it..
keith, i understand exactly his reasoning behind it, and all about float levels and metering. my point is the angle at which the intake assembly meets the head is less than desirable and will do nothing in the line of promoting flow. have a look at the cutaway picture i posted, youll see that the port angle is quite low. im not turning this into a *****ing session as ive had enough of that on internet forums. all im saying is giving the angle the carbs have to be mounted at in order for them to meter correctly makes them unsuitable for this application as the transition angle is crazy.
