how strong are these models transmissions & which gears are the strongest if any? im in the process of putting a 2000 cbr 600 engine in a particularly sturdy & heavy dune buggy, should i be concerned about damage to the transmission if running it hard regularly (not past redline though)?

 

The trannys in these are the toughest in sportbikes.BTW,a 2000 CBR motor is an F4.

No worries.

 

you could redline the f outta it and it will still run a good 20,000 miles without any problems.

 

hmm got any pics of the setup?

 

My street F2 has over 50k ham-fisted miles on it and no worries whatsoever.I did shim the valves to put them "toward the top of the window".Didn't need it,but did it anyway.

Other than that,basic maintenance.

 

What you have to consider for this question is how the engine will be used. In a bike, you're getting a LOT of airflow over the radiator because of the velocity of travel.

In a dune buggy you're probably not going to be going nearly as fast, and there's a much heavier load.

I think it'll work fine but you might consider a larger radiator and working up a manual switch with a good fan and shroud to make sure you're getting plenty of cooling power to the engine.

Also depends on your location. I know down here in Florida in the summer it can be pretty brutal from a temperature perspective. Just keep that in mind and watch your temp gauge dude.

edit: Sorry, read it wrong and answered from an engine perspective.

There's definitely going to be a lot higher load on the tranny. Larger tires (and two of them) to get moving. If you're using it in the types of areas that I ride dirtbikes/atvs, its sand and you'll have a lot of low speed(relatively), and high rpm travel and that suckers going to be working.

I can't give you a yes or no on how long the tranny will last, but it will definitely be working a LOT harder than on a bike. Just like on a bike, I would think 1st and 2nd gear will be taking most of the abuse.

 

i wouldnt be running it hard in the first 2 gears, im in the process of setting up either some sort of vtec setup, or just going with a cam that tops power out at 8 or 9 grand (it really doesnt NEED to be fast as hell, but if this custom vtec setup pans out i figure there would be quite a few that would want such a setup for their bikes so when cruising at low rpms, excellent mpg could be achieved & torque would be nice).


what im doing is trying to beef up this motor (better timing chain, valves, pistons, connecting rods, & timing chain tensioner), as well as having the crank & transmission gears cryo'd & maybe nitrided or something (not sure about that one yet).

anyone have any suggestions on how to strengthen the tranny gears beyond having them cryo'd? or does anyone make high strength aftermarket gears?


P.S. i also live where it nearly never tops 100 degrees & im also going to have an oversized radiator with a strong radiator fan to match (no WAY am i letting this thing overheat with all of this work going into it!!)

 

I can tell ya that on occasion second gear will have a problem, but this isn't specific to CBRs though. The dogs on the gear wear out and all the transmission to slip out of gear. Other than that, that's about all I can think of. How heavy will your buggy be you think?

 

i figure somewhere around 1000-1400lb region.

also what do you mean by the dogs on the transmission?