Messages

1

Honda / Re: CR480 Carb Upgrades

« on: August 15, 2014, 06:59:44 am »

Also found this in my notes. Again for a 1984 CR500. Not sure where I got it from but it looks ballpark

PWK 38 or 39.5
Main            175
Pilot            48
Needle         1368 for 38, 1370 for 39.5
Clip              3
Cutaway       6
Idle              2

I've got a 38mm PWK quad vent air striker on a 2014 300 EXC. It is easy to tune and pretty much faultless using triple taper Suzuki needles (NECJ). The over rev with the 38 is impressive with no loss off the bottom. Great carby if only I could use one on the 84 500.

Brett

2

Honda / Re: CR480 Carb Upgrades

« on: August 14, 2014, 09:20:30 pm »

DB Feburary 1984 vol 14 no.2. to quote "with the carb switch, the Honda got a new personality. Gone was the raspy power delivery and the hard starting. Detonation and pinging were greatly reduced." I've got one on order as I feel it will be as good as anything for a class legal carburettor.

Brett

3

Honda / Re: CR480 Carb Upgrades

« on: August 12, 2014, 07:05:15 pm »

Some jetting specs I have from an old article in Dirt Bike for the 38mm TM on a 1984 CR500. I'll be testing this soon on a 84 500.
Probably a reasonable start for a 480

Pilot             50
Main             350
Needle jet     R-0   Possibly Q-8 R-2 depending on altitude and temp
Slide             2.5
Needle          6FM46
Float Needle  3.5