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I havent rode with those settings yet as the weather in the UK is awful at the moment. Can anyone who rides in Europe also tell me what their settings are?
I'm running a Bud Racing pipe & silencer with VF3.
The Shop
430 main
40 pilot
OEM needle with clip 3rd
air screw 1 - 1.25 out
Fuel: premixed VP T2
Winter:
440 Main
42 pilot
OEM Needle clip in 3rd
air screw 1.5 - 2
This is on a national build motor with FMF Pipe/Silencer
The settings he gave me. I'm no National rider by any stretch of the imagination.
I have a 2006 and I am running the stock needle in stock position, up one on the pilot to 42.5 and down 1 on the main to 400 (stock was 410) with a Bill's pipe and silencer (same jetting used for FMF) and VP MS-100 mixed 32:1 with Maxima Super-M. I ride 1,000 - 5,000 ft with this jetting. If I go below 1,000 or temp below 50 degrees I put the 410 main back in. I've tried going richer and leaner on all jets one by one to test everything and this is where I ended up. Here's the results.
the bike would run around 2 minutes on the track before getting hot and bogging
at first the jetting was stock, but i started increasing the main (which did help)
i think the 440 main is straight up, too lean, if you ride wide open sand at sea level even at 75f+
i have a variety of suzuki needles for the bike, but i havent tried any(yet)
i think with at least a 460 main and adjusting clip position to #4, there would likely be bare minimum fuel
aftermarket reeds, exhaust pipes, probably affect this setting a lot
i wish i put in the 500 main instead of the 440 that day, for sure
just recently picked up a super low hour 2017 yz125, and i'm worried that the jetting situation will be the same (even though stock is much richer compared to the suzuki rm 125)
i can only find main jets up to 470 in the oem catalog, but ive heard of people using for example a 510 main
huh now i'm wondering since the carburetors are very similar in appearance, perhaps the array of jets i've got for the suzuki will possibly fit the yamaha
i guess if your fuel or motor requires a leaner mixture, ok, but for the rest of us using normal fuel like pump premium or av100ll, at stock oil mixture, i reckon the bike on a 440 main would only last as long as it takes your ability to increase then you'll be turning rpm and the motor will fail in short order, now this is just my hypothesis, because with a #370 main in the suzuki, there was no way that engine was going to stay together unless it was a novice mini transplant slow riding the backyard
idk, i think in the yamaha, i'll try a size smaller pilot from stock, keep a vast assortment of needles on hand, and run the clip in #4 potentially, with the main jet at least 480 to start, at 30:1 oil mixture
genuinely i believe that these bikes are chronically underfueled from the manufacturers to limit the amount of time we can ride before catastrophic engine failure... i mean, if all we did was rings and pistons over the course of 100+ hours, how would the manufacturer make any money selling expensive parts or replacement bikes?
But, it makes riding a TC/SX125 "depressing"...
They make my RM look as slow...well...as it is.
Pit Row
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