Dynoman Performance - Austin Texas - Motorcycle Racing Parts

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FAQ - CARBURETION back to main faq page



I'm getting ready to order a set of CR carbs. Seems to be three options on carb size; 29,31,or 33. My stock carbs are 33mm. It's a 1980 Honda CB750K DOHC. What should I order?

It is very common for people to try to compare the size of the stock carbs to the size of the CR carbs when choosing what CRs to order, however as the CR carbs are smooth bore race carbs and not emissions carbs it is not an accurate comparison.

It is all about the flow and the CRs flow much better than CV carbs, so CR 33mm carbs would be too large for your bike - unless your engine was modified. You will get the best horsepower increase with the CR 31mm carbs. They have a very good dynamic fuel curve on the DOHC 750 and cost less than the 33s as well. The 33s would hurt your low and midrange power and give you no more top end power than the 31s. The 29s will also work and in some instances are preferable.

I have a CB900F. Does my stock ignition have enough fire to fully utilize Keihin CR carbs? I am considering adding Dyna coils.

Installing the Dyna coils is a good improvement over the stock coils, however if it is in your budget we would highly recommend the Dyna 2000 with coils for the best performance. It is a totally digital system that replaces all of the stock components. It replaces the sloppy spring type advance unit with a static rotor, as all of the advance is done electronically and the advance curves can be changed with the flip of a switch. It will give you three times the spark energy to your plugs over the stock ignition and comes with a built in adjustable rev limiter as well. You can see them on this page of our website: http://dynoman.net/ignition/dyna2000.html

In the early 80s, Lee Chapin from American Mikuni called us and said that they were getting a lot of complaints about their 33mm smooth bore carbs on CB900-1100 models. They knew that we built these bikes and used their carbs without any problems. They wanted to send us some of the problem carbs that had been returned to them so we could try them. They sent 3 sets and we installed them on our customers bikes and they all worked very well. The reason for this was when we built the motors in the old days we always installed a Dyna CR ignition. The carbs were not the problem, the ignition was just not able to produce enough energy to make the carbs work properly. Mikuni was very happy to hear this and the next set of carbs we ordered from them had a note in the box that said, "Before you blame our carbs, upgrade your ignition on DOHC 900-1100 models."

The Dyna CR was a much hotter ignition than stock, but the Dyna 2000 that we have today is even better!


Intake Manifolds

I am looking at part number #DP IMC-SPEC. How do the clamps connect?
Is there a screw that pulls them together?

They are stainless steel clamps that screw tighten like any screw type hose clamp, however they are narrow and fit the groves in your rubber intake manifolds. They are longer than you need, as they fit other models as well, but can be trimmed to length easily. When installed they look like a stainless steel band if you turn the screws to the inside.



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