TE/TC RK Tech head

Sounds good, and you got me motivated to look at my plug. Pretty happy here. This is with a couple rides at 30/5.0/S4/43-74-3/520.

Nice plug. Wish mine looked like that. Cam.

Finally got my RK Tech insert and V Force 4 reed block installed this weekend, started 3rd stab at the kicker. It seems to need a bit more boot on the kick starter now and is definitely snappier down low, the estarter doesn't seem to care. My stock reed block wasn't terrible but I could see daylight full length on two of the reeds.

I was only able to ride it for about 5-10 minutes in my back field just to check and make sure the jetting wasn't too far off. When I put the new parts on I set jetting back to stock, 480 MJ, 40 PJ, 43-74 needle clip 3, S1 needle jet, air screw at 1.5 open, yellow spring 2 turns in from flush,and stock #4 slide (the stock jetting was way to rich with the stock head). 92 octane non-ethanol super, 60:1, 40-55 F this time of year.

It has a slightly high idle that comes down after 5-10 seconds. Not an expert here but doesn't that indicate a slightly lean idle condition? I'll play with the air screw setting and possibly go up a size on the PJ? I've read some pretty rich settings posted by a guy in the UK. I live at 150 feet asl but ride up around 1700 to 3200 so I hesitate to jet it at 150 feet and then be too rich at the normal riding altitude. I ride tight single track with few to no opportunities to hold the throttle wide open for more than a few seconds unless I'm going down a road that connects the trails. Looking for advice on this jetting set up if anybody has any.

Finally got a chance to try out the new head in the woods. It is the real deal for sure. Nice bump through the entire range of power and real noticeable at low R's. Enough so that I'm going to take off the bigger rear sprocket and go back to the stock one. Ended up with the 490 MJ for now but I do have a bit of an issue when transitioning through the mid-range that I didn't notice when riding on my flat field. I'm going to play with the PV setting (at the moment 2 turns in with yellow spring) to see if that will tune it out and if it doesn't I'll try dropping the needle one clip. I'm assuming it is rich through the transition as I have more spooge/smoke than I had with the stock head and leaner jetting. I also noticed when I selected the #2 map switch setting it did seem to make the rev range with the problem get smaller. Can't wait until I have it dialed all the way. One other observation is this sure is a cold blooded motor, even when going hard the radiators seem pretty cool to the touch.

Very nice. The one is a bathtub an the other a low profile hemi? Hard to tell from the pics. I am very interrested to find out how they work. Cam

Me too. Took the stock head down a bit more to .030" installed. Made another noticeable improvement. Clean and smooth, and more low end torque. I think it wants more fuel at the very smallest openings. Gonna bump pilot from 30 to 32.5.

You could carve shallow fins on the insert to increase the surface are for cooling. Be easy to 25% more area. Very nice. Cam

Dgargiulo21, I will be deleting my posts here as they do not have any relationship with your RK Tek thread. Please accept my apologies for not knowing how message boards work.