WR400 CARB Swap Options???
Posted July 31, 2005 - 04:54 PM
Soooooo, i'm thinking it's time for a new carb. will the drz400 carb swap in? i wouldn't mind having a cv carb because a flat slide can be a bit jerky for street riding, and i'm never going to be a competitive racer anyway so i'm willing to trade horsepower for more reliability/smooth ride. plus everyone that has CA drz's wants flat slides so they sell the stockers for cheap. i don't know if it'll fit though.
any carb swap suggestions would be greatly appreciated. thanks in advance...
Posted July 31, 2005 - 05:17 PM
Posted July 31, 2005 - 08:15 PM
Posted August 01, 2005 - 11:12 AM
These are the fit issues that I ran into this week, and that I know you would have to address. (if you have a 1998-2000)
1) The rubber boot from the engine to the carb will not fit. The CV carb is only 36 mm vs. the FCR carb, which is 39. I have the stock (DRZS) rubber boot, but I do not know if the engine’s intake on a DRZ400S is the same size as the intake on a YZ400. If they were the same size, then you could just use the stock rubber boot off of a DRZ400s.
2) The rubber boot that goes from the air box to the CV carb will not fit. The intake diameter on the CV carb is bigger then the diameter on the FCR39 carb. You might be able to use a stock DRZ400S boot, but I would not know if it would fit with an YZ400 airbox.
3) The bracket on the carburetor that holds the throttle cables will give you some fit issues as well. The distance between where the cables bolt on to the carb to where the cable ends are hooked into the little holes on the throttle wheel is longer on the CV carb vs the FCR carb. (When I did my swap, I had to use a set of cables off of an YZ400.)
As you can tell, I have all of the parts you might need. Carb, boots, cables. I’d be more then willing to help you out. To start off, we would need to know the following:
1) What is the outside diameter of the intake on your engine? Then we could compare it to the inside diameter of the rubber boot.
2) What is the outside diameter of the hole on your airbox?
If you do measure these items, it would be best to do it with a dial caliber vs. a tape measure.
Posted August 01, 2005 - 08:01 PM
other option, from what i hear from the supermotojunkie folks, is that they fixed the slide problem in 2000 with the fcr2 carb. just wish i knew that before braking three plates at $75 each.