Twin dio possible?

eliteguy50 · Post by **eliteguy50** » Wed Feb 15, 2012 12:56 am

Tuning them to be equal so there is no push/pull in trike formation.

Majourlittle · Post by **Majourlittle** » Wed Feb 15, 2012 8:19 am

No trike. I am wanting to build a two cyl dio motor.

Carnie · Post by **Carnie** » Wed Feb 15, 2012 9:18 am

I think you would have to go with two carbs and sync them because the fuel and air mixture would be inconsistent between the cylinders but I may be wrong...

Bear45-70 · Post by **Bear45-70** » Wed Feb 15, 2012 10:23 am

Carnie wrote:I think you would have to go with two carbs and sync them because the fuel and air mixture would be inconsistent between the cylinders but I may be wrong...

I've seen many twin 2 strokes with a single carb, or 4 cylinder with a 2 barrel carb and a 6 cylinder with 3 carbs.

Mystic · Post by **Mystic** » Wed Feb 15, 2012 10:29 am

The honda cmx250 rebel is a twin cylinder with a single carb

Majourlittle · Post by **Majourlittle** » Wed Feb 15, 2012 10:34 am

Do you think that an OKO carb could feed both cyls if oyu fed it from the far left and tried to feed it to the far right cyl through the crank area?

swimmingfree · Post by **swimmingfree** » Wed Feb 15, 2012 10:41 am

i think you will need 2 carb and both cases sealed from each other if the fires ever 180 deg.. because the cases wood not make a vacuum to pull in fuel mix .. but if both fired at the same time 1 carb wood do it
swimmingfree

Bear45-70 · Post by **Bear45-70** » Wed Feb 15, 2012 10:47 am

Majourlittle wrote:Do you think that an OKO carb could feed both cyls if oyu fed it from the far left and tried to feed it to the far right cyl through the crank area?

You have to use separate reeds for each cylinder and the crankcase has to be separate for each cylinder. You also need to keep the intake length identical for both cylinders to use a single carb.

Bear45-70 · Post by **Bear45-70** » Wed Feb 15, 2012 10:51 am

swimmingfree wrote:i think you will need 2 carb and both cases sealed from each other if the fires ever 180 deg.. because the cases wood not make a vacuum to pull in fuel mix .. but if both fired at the same time 1 carb wood do it
swimmingfree

Almost every 2 cylinder 2 stroke outboard ever made had a single carb. Separate reeds but a single carb and yest the crankcase have to be sealed from each other.

swimmingfree · Post by **swimmingfree** » Wed Feb 15, 2012 10:56 am

i never though of that you 100% wright .. good point ..
if i was to make it wood be ezer to put 2 carbs then make that manafold .. but on the other hand its harder to tune 2 carb then 1...
swimmingfree

eliteguy50 · Post by **eliteguy50** » Wed Feb 15, 2012 11:16 am

How are you going to start this beast?

swimmingfree · Post by **swimmingfree** » Wed Feb 15, 2012 11:17 am

the nut on the fly wheel and a drill ..
swimmingfree

eliteguy50 · Post by **eliteguy50** » Wed Feb 15, 2012 11:44 am

swimmingfree wrote:the nut on the fly wheel and a drill ..
swimmingfree

Doubling the.compression load means more stress on the shaft threads that were never designed for that.

Majourlittle · Post by **Majourlittle** » Wed Feb 15, 2012 12:53 pm

I figured that it could be kickstarted. The intake has taken most of my pondering.

eliteguy50 · Post by **eliteguy50** » Wed Feb 15, 2012 1:11 pm

I don't know if it will work but I would always ride with a spare. Look at how many times it has failed on the bbk scoots or even the stock scoots. I would reinforce any part that you can. Are you going to cut the case and cranks to fit them together or are you making your own case?

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Twin dio possible?

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