Just wondering, if anyone has a similar setup as I do and what settings they are using, Explanation for the question. Ridding the bike today, first time on a 40 mile ride, bike is good but clearly tuning has to be done on it. So seems good to half throttle, at half throttle kind of seems like its getting too much gas, 3/4 and up oh ya too much gas starts to slow down, then I roll it back it speeds up so Mains are Too big, I'll do plug chops next week but I think its obvious the mains are too big just based on it bogs when I open it up and then picks up speed when I back off on the throttle, at least this is what makes sense to me. So I'm thinking about dropping the needle from position 3 to position 2 to lean out the mid a little bit and then smaller mains.
I'm just wondering what setup others have that may have a similar setup as my self.
setup is as follows
1973 Yamaha RD350
Dave F mod, with the suggested Needle, Needle Jet and slide for the Dave F mod
220 mains
35 pilots, the pilot circuit seems really good, Air screw is 1 turn out.
Vape Ignition
Y-boot K&N filter
JL Pipes
Open to other peoples thoughts.
I know everybody is different so I'm not basing what I end up doing on what others are I'm just wondering.
Since posting this Last night, this morning I found a "2 stroke world Jetting Poll" I have the info I wanted, however if you would still like to respond to this, please do. Cheers.
drop the main to a 200 and lean the needle 1 clip see where it is there.
Quote from: m in sc on September 30, 2023, 08:54:37 AMdrop the main to a 200 and lean the needle 1 clip see where it is there.
So one can do plug chops to figure out what your mains should be, Can you mid range also be determined by plug chops?
absolutely
Quote from: m in sc on October 01, 2023, 09:33:24 AMabsolutely
Thanks buddy I'll google how to do that
Cheers.
Quote from: m in sc on October 01, 2023, 09:33:24 AMabsolutely
so to tune your mid range reading plugs, do I understand, its the same is doing your mains but you Hold the throttle half to 3/4 open ?
yes. mark the throttle at 1/4, 1/2, 3/4 positions (masking tape and a sharpie are good) and you can do readings at any of these to determine circuit tuning. you need at least a half mile , a steady throttle hand, and be on a slight uphill or load. then pull plug take a look at it. . plug chops should be at the base of the porcelain, you can usually see this with a very bright flashlight and a jewelers loupe. new plugs should be used.
Quote from: m in sc on October 02, 2023, 09:02:41 AMyes. mark the throttle at 1/4, 1/2, 3/4 positions (masking tape and a sharpie are good) and you can do readings at any of these to determine circuit tuning. you need at least a half mile , a steady throttle hand, and be on a slight uphill or load. then pull plug take a look at it. . plug chops should be at the base of the porcelain, you can usually see this with a very bright flashlight and a jewelers loupe. new plugs should be used.
Thanks cheers
A couple of questions.
First I changed the spacer from in-between the carb and the read block to in-between the read block and the cylinder effectively moving the read block out, Night and day, power band comes in much lower where I'm use to it. However jetting has changed a bit this is where the questions are.
So with me doing the pilot jet and air screw adjustment, I'm always second guessing myself, what I mean is I'll turn the the air screw a 1/4 turn and I'll be thinking, "did the idle go up" hmmm turn it back "did it go down" hmm maybe I should turn it a 1/2 turn hmm "did it go up or am I hearing things. So am I the only one who plays this stupid head game with them selves lololol and would a good rule of thumb,
Q1) If its not obvious the RPM increased they probably didn't? sorry I have to ask.
Q2) If its a bit hard to start (2 or 3 kicks rather than 1) and keep idle, could a air screw that is set too Rich cause those problems.