So I converted my raptor 660 to a single carb, using a HSR48. I love the bike and everything I have done, except one thing. I haven't really been able to really ride it as jetting this thing has me going crazy. The bike is running a 14/42 gearing and 22" tall tires, both in dirt and sand. Elevation is about 2200'
I will list the mods-
2005 Raptor 660
Had curevo do a killer port and polish on the head, valves, they did the works
Running monster duals, big bore pipes with shorty cans
X4 Cam with wellers racing decomp pin kit
Had falicon installed a knife connecting rod, not trying to split the cases here lol
Single carb HSR48
FCI/custom intake, using FCI filter and pre wrap
2 into 1 manifold for the carb
ARP main and head studs
Eliminated a lot of wires (lightning, dash lights, just the random useless wires to me) Ground the "known" wires reverse, cdi, and all that
Modified the reluctor wheel so only two pins that are 180 degrees out
Complete hinson clutch setup
Installed a 12.5:1 CP piston
102 MM big bore
Custom made oil lines
Terry dual gasser
CFM oversized oil tank
IMS oversized fuel tank
Should be a solid 70 hp from Daniel at Cuervo. I am running the stock plug and run 100 octane race gas, and sometimes mix with U4, C16, or 110. Have NOT heard any detonation at all.
**I run the trail tech vapor and tapped the top of the stock thermostat for coolant temps using the supplied probe that came in the trail tech kit. I still run the stock fan so when it gets however hot 220 or something the fan WILL kick on. Been there and heard it happen.
I have checked for air leaks and none to my eye.
I read the manual and it said that 140 degrees is operating temp. I looked around and other guys riding seem to be at 170-190, sometimes 200 beating on it. I ride mainly wide open stuff, desert, dunes, some trails up in the mountains/hills. Yet, the bike was built for desert racing and to be a duner if it wanted.
As you can see, no expense was spared. So it is nerve racking to get this jetting figured out. Carb came with a stock 25 pilot I want to say and I have up to 50, in 5 increments. The main jet came with 165. I have from 170 to 200 in 5 increments. I started with what was in the carb and worked my way to the following. Seems to be getting better, worse and such. At first with stock jetting the head pipes would glow cherry red. So kept upping the pilot and main and needle and going round and round. I got to here and it is getting much better and can ride longer. On the flats at the dry lake bed, the bike will bounce off the rev limiter, so looking into the dynatek programmable CDI with tunes from Kenz once I get the jetting figured out, hoping sooner, than later!
Here is what I have done-
45 pilot jet
2-1/2 turns out on air/fuel screw
Needle 2nd from the top
Coolant is running about 160-180 in the sweet spot.
It will creep up to 200 when letting it idle for a min or two and just gets hotter and hotter.
Riding in 70 degree weather for this trip. Maybe an hour of run time total.
Looking at plug showed was lean, bike felt sluggish while riding also. Had a stumble in 3rd gear when hitting it to go wide open so played with jetting again.
-So tried this
2-1/2 turns out on air/fuel
needle in the middle
Coolant temp on trail tech is about 130-140 cruising and when I beat on it maybe gets to 160.
I am riding in 45-50 degree weather for this trip, yet I feel that shouldn't make a difference. My dirt bike gets to temp in this weather. Also did maybe 20 mins and could tell it was lean.
Takes a good 3-5 mins to get up to 200 degrees at idle, hell probably longer.
Plug tip is white, yet base is brown/black and almost looks wet. Rode it and hauls the mail, yet when coming to a stop from 1/2 throttle or more it will die and have to refire. When cruising it will bog/lean out I am guessing, than gets up and goes. Also, on decel it will backfire some. So it is lean.
-My next try for jetting is-
2-1/2 or so turns out on air/fuel
needle in the middle and see where that goes.
Correct me if I am wrong, yet from what I gathered is pilot is stock to about 1/8 throttle and controls the idle temp from what I was seeing, as well as the air/ fuel.
The main jet controls 3/4 to wide open.
The needle is 1/4 to 3/4 throttle.
Also referencing the tuning manual for the carb.
So any tips and advice? I love the bike and determined to dial it in. Just looking for another brain to bounce ideas off of.
Also, those who run monster pipes do your head pipes, coming out of the head, maybe 2-4 inches get cherry red hot were at night you can see them glow? Or is it just me and my jetting? LOL