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#1 |
Join Date: Aug 2020
Location: Colorado
Posts: 84
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I have a Vader 125cc with a knock off Mikuni VM22 and was wondering what jets you guys use? The one I bought already has a 95 in it.
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#4 |
Join Date: Aug 2009
Posts: 552
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You'd probably be better off trying the #95 main before anything else, it might be fine for your elevation.
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#5 |
Join Date: May 2020
Location: California
Posts: 169
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I'm at 50' above sea level. So it depends.
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2020 Boom Vader Gen 2 2019 CSC TT250 2021 Kayo Fox 70 |
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#6 |
Join Date: Mar 2015
Location: Spokane, WA
Posts: 253
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I have the vm22 on my Hellcat 125... using the stock intake and airbox.
I'm running the stock pilot. Not sure on how many turns on the A/F screw. My needle on the throttle has a small washer underneath it. I actually had to lower my needle (raise clip) to lean out the mid-range... it was bogging and stalling bad. I drilled out my main to ~#98-ish... but it is still not enough. I can't fully rev it out. Going to try #100 next. I'm at 2200ft elevation. Cheers!
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'20 TaoTao Hellcat 125 "grommet" '04 Yamaha TTR-125LE '00 Yamaha TTR-90 '07 Kinroad XT200GY Runmaster (sold) '07 KMD GY6 150cc ATV (sold) '07 Kangchao 250cc ATV Monster (sold) Baja Moto DB-30 "Doodlebugs"(x3) (sold) '06 Hi-Bird 200 parts bike (sold) |
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#7 | |
Join Date: Aug 2020
Location: Colorado
Posts: 84
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Quote:
I'll have to see how it goes with the stock 95. I bought a pack of jets so I'll try to tune it if it needs it. I'm not too experienced on jetting, so I guess as long as it isn't cutting out full throttle? I'm at about 6500ft. Last edited by Medicbobs; 08-07-2020 at 01:00 AM. Reason: spelling |
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#8 |
Join Date: May 2020
Location: California
Posts: 169
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It depends on throttle position on what you want to adjust. Idle to part throttle is going to be the idle mixture screw/pilot jet, mid range is your needle, full throttle is your main jet. Their is overlap though. Too rich it will surge and pop, too lean it will bog.
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2020 Boom Vader Gen 2 2019 CSC TT250 2021 Kayo Fox 70 |
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#9 | |
Join Date: Aug 2020
Location: Colorado
Posts: 84
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Quote:
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#10 |
Join Date: Mar 2015
Location: Spokane, WA
Posts: 253
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Finished tuning my HC this past weekend.
Stock exhaust Stock intake and spacer (spacer tapered a tad to smooth airflow out of larger diameter carb into smaller diameter spacer) Airbox removed... running cheap pod filter VM22 carb #100 main jet stock pilot jet A/F screw at 1 turn out Throttle needle lowered - raised c-clip to top notch - still has stock washer under the needle clip 2200ft elevation runs great... full rpm... max 55mph indicated with my #210butt on it. Starts quick... great throttle response. I'm calling this one tuned. Good luck dialing in your carbs!
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'20 TaoTao Hellcat 125 "grommet" '04 Yamaha TTR-125LE '00 Yamaha TTR-90 '07 Kinroad XT200GY Runmaster (sold) '07 KMD GY6 150cc ATV (sold) '07 Kangchao 250cc ATV Monster (sold) Baja Moto DB-30 "Doodlebugs"(x3) (sold) '06 Hi-Bird 200 parts bike (sold) |
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#11 | |
Join Date: Aug 2020
Location: Colorado
Posts: 84
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Quote:
Hell yeah man! Thanks for the reply. I keep thinking I might throw this 100 main jet in. Do you have a real mikuni or a knock-off? I got the knock-off. Heard it runs fine as well. |
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#12 | |
Join Date: Mar 2015
Location: Spokane, WA
Posts: 253
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Quote:
My vm22 is a knock-off... the $30 one on fleabay. Works better than the stock PZ-25 it came with. I like the enricher on the carb much better than the PZ-25 choke plate. It makes a perfect starting high idle. And using the stock intake points the carb rearward putting the enricher lever on the easy to reach left side. Cheers!
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'20 TaoTao Hellcat 125 "grommet" '04 Yamaha TTR-125LE '00 Yamaha TTR-90 '07 Kinroad XT200GY Runmaster (sold) '07 KMD GY6 150cc ATV (sold) '07 Kangchao 250cc ATV Monster (sold) Baja Moto DB-30 "Doodlebugs"(x3) (sold) '06 Hi-Bird 200 parts bike (sold) |
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#13 |
Join Date: Apr 2020
Posts: 2
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my Hellcat has the following mods:
- VM22 knockoff kit from eBay - Aluminum intake that was included with carb (larger diameter than stock) - enlarged opening in paper carb gasket so it is no longer a restriction - drilled out welding inside header pipe so it wasn't such a large obstruction (used a step drill) - oiled foam filer (not the K&N-style pleated cotton one included with the carb) - no airbox, carb pointed forward With that setup, it kept running lean even with a #125 jet! It was surging and the plug tip was whitish. Since I only had jets up to #125 and I didn't want to wait for the new ones to get here, I took the stock jet and drilled it out until it was slightly bigger than the #125. I actually put the jet in my drill chuck and the tiny drill bit in a vise. I'm not sure exactly how big the hole was when I was done, since the bit was a 1mm I think. The drill bit had a little more wiggle room in this jet than in the #125. After that it ran pretty good, so I left it in. My bigger jets came in the mail, but I haven't had time to try them yet I left the needle and pilot jet alone. I think I set the pilot screw at 1.5 turns out |
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#14 |
Join Date: May 2020
Location: California
Posts: 169
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I'm running a 110 now. Initially I tuned the carb when it was ~ 100 degrees every day. Last night I rode it in 75 degree weather and the bike was not happy. Test rode it today at 75 degree temps with the bigger jet and it's running good now. I will see how it reacts once it warms up today. Would be nice to get a jet in there that covers a broad range of temp difference just adjusting the needle.
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2020 Boom Vader Gen 2 2019 CSC TT250 2021 Kayo Fox 70 |
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#15 | |
Join Date: Aug 2020
Location: Colorado
Posts: 84
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Quote:
I also took that charcoal canister out because I felt it was either pinching my fuel line or choking it somewhere. I'm going to try and tune it again. It'll be in the 70s this weekend. |
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Tags |
boom, grom, mikuni, vader, vm22 |
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