1. Forum
  2. Discussion
  3. Ask a Question!
  4. 1994 VT600 3rd and 4th Gear Mid-Range Bog/Sputter - HELP!

Participants

1994 VT600 3rd and 4th Gear Mid-Range Bog/Sputter - HELP!

  • JONATHAN HOBBS

    Velocity stacks, boot burners, new carb boots, and brutal carb tune kit. I have pulled the carbs 3x now and feel I have the jets/mix-screw/idle set correctly but I still get a bog/hesitation on 3rd and 4th gear from 1/4 to 3/4 throttle - idle and WOT is fine. When I pull the "choke" (enrichment circuit) while riding the bog goes away telling me I'm lean. The bowl isn't emptying because it's fine at WOT. I do not believe there are any vaccum leaks. I have two shims per needle and read I can't add another shim nor dill another hole or widen the current hole in the slides. Any suggestions much appreciated! current jets are front 48/145 and rear 48/148. I live in the northeast of the USA. 
  • TJ

    @JONATHAN HOBBS dont use different sizez of jets on the carbs, match both sides, also if your jet needle doesnt move up and down freely and wiggle side to side you need to clip down the post that holds the spring for the needle. clip it down so that the spring  still fits on it but so that with the shims, the needle has some flex. 

    did the bike run perfectly before you tried all this or was it a basketcase or something?

    DO FUN SHIT!
    Check the FAQ's here for tons of tuning info and more!! - t.ly/MA6r6
  • JONATHAN HOBBS

    @TJ I bought the bike in December in rough stock condition - freezing outside where I live. I was able to grunt my was through a quick 15 minute ride but to answer the question, yes, there was hesitation 3rd gear - didn't make it to 4th... I thought the issue would go away with the carb rebuild. I'll try to clip the post and match the jets. Thank you
  • JONATHAN HOBBS

    Update! When I pulled the carbs to match jets and clip the slide spring posts, I decided to compare the OEM slides to the TJ slides and noticed the OEM diaphrams were quite smaller. I decided to go back to the OEM slides and have no more hesitation from 1/4 to 3/4 throttle!! Pulled plugs which look great too - no more signs of a lean condition. Curious on your thoughts. Do single carb setups have a larger diaphram? perhaps I bought two slides that were each meant for a single carb setup?
  • Biketon

    @JONATHAN HOBBS do the tjb slide have a little loop en the lip. I mean the edges of the diafram
  • TJ

    @JONATHAN HOBBS please reach out to customer service, they can help you determien if you got the correct slides. 

    DO FUN SHIT!
    Check the FAQ's here for tons of tuning info and more!! - t.ly/MA6r6
  • JONATHAN HOBBS

    @Biketon yeah, they have a little loop on the lip.
Please login to reply to this topic!
© 2026, TJ Brutal Customs | Powered by Xenforum