300 SQUISH AND RK HEAD

[LRM]

Squish does change jetting needs. Tighter needs more fuel to stay happy.
Stock dome is 1.9mm, Beta HC dome is 1.4mm, RK (pump gas, sea level) is 0.9mm.
The base gaskets are different between the RE and RR.
RE has a 0.5mm and the RR have 0.6mm or 0.7mm depending on the year.

RK Head needs the BPR7ES plug, possibly BPR8ES. BR7ES just never worked right.

At sea level, in winter temps...the RK was impossible for me to get perfect on the stock pipe. I had to wait till temps stayed above 50degF before really getting close.

I disagree, higher compression need more octane, not necessarily more fuel.

[redbeta203]

Update:

Seems to run a lot better with the n8rh needle clip #3. Backed the air screw out until it stopped getting decel knock and still had crisp throttle response. Sitting at 2 turns right now. I ran it for about 15 minutes and got it to knock twice in that span which I believe is acceptable and I was engine braking a lot to test it. Definitely a huge improvement and will continue to fine tune. I also turned the idle up a tad and that maybe helped as well.

I did not know that about the plug. I thought the projected plug is unnecessary with that dome shape. I will give a bpr7es a go since they are cheap. Would you recommend gapping that down as well?

Thanks everyone for the help. I wasn’t expecting to get so many responses. Really happy with the results so far.

[aj_mariner]

I couldn’t tell a difference when gapping it down