I want to change the gearing so the bike accelerates faster and gets to rpm's where the motor makes power. I'm not worried about losing top-end speed, I want faster acceleration. My dyno operator said that the hp gain per changing the card to a Mikuni wouldn't be worth the investment. He wants to do more tuning on the card with a new air cleaner. We didn't have time to change the jets or perform alot of tuning. So all the dynos numbers were off of how the bike is currently tuned. An air cleaner and re-jetting as to be done. He did suggest a different igntion from Daytona Twin Tec. I currently have a Dyna ignition. The Twin Tec can have custom ignition curves installed. He just installed one in a bike and after the custom curve, the bike gained 7hp. Seems like alot to me, but I don't have a ton of experiance with ignition modules. Any thoughts?

 

So your "Dyno" tech said a Mikuni carb(known as one of the most tunable carbs on the market with the best throttle responses you will ever feel)which you can get for around $350 on Ebay isn't worth the investment, but pay a few hundred bucks for another ignition module is?

The DTT ignition may help you dial your ride in a tad bit more, but not as much as changing out that carb.

Besides, you could easily get a few hundred bucks for your CV 44 carb, making the "investment" to the Mikuni very minimal at best. You could actually do the same for the ignition module(as I do feel the DTT is a slight upgrade as well).

Realise that the Mikuni carb not only flows better, its a better overal setup. Its much easier to get your A/F dialed in perfectly across the board, but the nicest thing about it is the "instant on" throttle response.

WHen you twist the throttle on a Mikuni, it makes the CV feel very very sluggish in response in a direct comparision. Its a huge night and day difference.

Telling you, that CV44 carb is a DOG, its not designed for "performance".

 

He said that the Mikuni is more tunable and better throttle response. But he didn't seem to think that I would gain a lot of peak numbers. What kind of gains could I expect, besides better throttle response? The other thing is what size of Mikuni would be the best. He seemed to think that the 42 would be enough. But I don't see how going smaller would help. Unless the Mikuni 42 just flows that much more air than my 44. I put a big carb on my drag car and it got slower. Overkilled the engine and ended up taking a hit on the carb and had to buy a smaller carb. I dont want the same problem with the bike.

 

A 48mm carb isn't putting on a "huge" drag carb at all. Its the proper size for engines in the 95"-107" range setups. I run a dual runner 50mm TB on my 98" setup, and its correctly sized.

Don't discount better throttle response, it makes your bike feel like a night and day difference. I have yet to meet one person who bought a Mikuni who wasnt extremly happy.

As for gains, I can see you hitting your 100/100 #'s pretty easily and a bit lower in the rpm range with that carb and a good flowing intake.

 

Thanks for the info