Originally Posted by
grizz1
Hi jnc011994
It should idle for quite some time before dying, certainly more then 10 secs.
When you have the LSN set right you will get a steady smooth idle and a very punchy take off from a standing start with full throttle.
Run the buggy for 30 secs or so and bring it in. If the idle starts high and then drops off quite markedly in a short time, your LSN is too rich. Lean 1/8 th of a turn at a time and repeat. When the buggy comes in and the idle stays the same speed for 15 secs or so, or even longer you are pretty close.
If the idle gets very erratic, speeding up and surging, your LSN is too lean, so richen by 1/8 of a turn at a time until you get the steady idle.
Providing you are running the long LSN all you need to do now is tweak the HSN a little if necessary for a nice top end. Do not lean by more then 1/4 turn though or you might start to get lean bog at half tank or lower. Basically leave the HSN at the .5 mark and tune with the LSN as described above.
Remember - this is only for the long LSN carb. Cheers
I do think i have the Long LSN, since its an old engine, i bought this engine 6 or 7 months ago. And yes, when i tested it, under running temp (i don't have a temp gun, but the engine is already hot) the idle starts high and drop off after 5 sec. which mean that i'm still running rich. I would re-test this on saturday so that i could get the desired condition on race time. really appreciate the help. One more thing, is the setting for the .28 Red Head the same with the .21? I also have an old .28.