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  1. S

    Diagnose V-Boost problems

    Hey all... I am relatively new to this forum and thanks for having me.. This may have been discussed in here already but here goes.. I have an '86 max with virtually no top end after 6000rpm. I have gone through the manual and when testing the servo it moves when I add power at the plug...
  2. rzwanink

    Weird sound, no vboost

    I ordered an Led headlight bulb with fan. fits and works great. Only 1 thing I just cant figure out.... the moment in removed the original bulb, and I turned on the contact, so I could could figure out which wire from the ledbuld would be paired to the original loom. A strage loud hummm...
  3. M

    V-boost issue - VIDEO

    1993 Vmax I need some advice about the V-boost. Recently I have disconnected the V-boost cable so I would be able to change the valve cover gaskets. After reconnected the cable looks very loose even after tying the adjusting screw all the way to the bottom. Also, it's not doing the up...
  4. rebeltaz83

    HP without vboost

    I've been looking for the HP rating on the v max without v boost for a few days now. I just want to know what the v max makes with out it. I'm curious to see just how much more v boost gives.
  5. U

    v-boost problem

    Hello all I have a suspicion the vboost not working I cannot feel that typical kick after 6K rpm…. I can say that: 1. At start the v-boost engine do make the self-test 2. I have no air box so I can see that the cable make a full way of movement and open the valve...
  6. S

    Vboost cable length

    Hey all I urgently need the length of the outer black for the vboost cable. I know the inner free length..just need stock outer size. Thanks
  7. cbanker

    Addicted to V-Boost T-Shirts

    :clapping:Hey there! I have a buddy made up some T-Shirts, "Addicted to V-Boost". Available in all normal sizes and four colors. Here is a link to the site for ordering. Takes at least a total of 15 to get the order done. Any combo of sizes and colors. I get nothing out of this. Just think the...
  8. tinman22

    Vboost problem

    Does anybody know where I can get one of these. Or just the worn out half? Yeah I know it's upside down. Or mayb just a whole vboost motor! Better yet how does this happen as I would like to find the cause before replacement.
  9. BigJimi

    VBoost working or not??????

    After reading a bunch of threads on this site I got to wondering if my VBoost was working correctly or not:ummm: For starters I have installed a VBoost switch to bring it on a 3000rpm vs 6000rpm, well when I rode the bike it really didn't feel any different no matter which way I had the...
  10. L.T.Stone

    Sporatic vboost

    Hi guys. Ok so after awhile I noticed my bike just seemed flat on the top end. Anyway when I turned on the bike it cycled the vboost but when revved up it did not open. So I pulled the top off the bike and sprayed 3/4 can of Seafoam in the carbs while running. Then what do you know the vboost...
  11. R

    V-boost adjustment

    how do i correctly adjust the cable in the v-boost valve to get it to open completely. Is it the screw above the black box ?? Thanks in advance Sent from my SM-N915G using Tapatalk
  12. 2

    Is it true Yamaha did NOT put Vboost in the 2006 model Vmax?

    Vboost Sent from my SM-N920T using Tapatalk
  13. T

    Dry shot nitrous with vboost?

    Hi all, It's my first time on the site and I'm loving it! I have had a quick look through previous topic and couldn't find any info relating to my question. I have a 1990 model vmax with vboost, I have fitted a sassy vboost controller which allows you to set your vboost to be fully open at...
  14. M

    Trippy Vboost?

    I have an 86 with an 01 motor. Sometimes shifting to 2nd I get neutral or it pops out of gear, I think thats just me shifting. Is that a common problem? Also when in 2nd gear my vboost seems to kick in and out randomly at various RPMs, sometimes feels harsh on the drivetrain. Only in 2nd gear...
  15. U

    do 85 V-Boost tubes is 30mm while 1986 and above is 32mm?

    I heard that VMAX'S of year 85 have V-Boost tubes is 30mm while 1986 and above have 32mm? This true? What is the meaning of that ? less power? More power? In this days I am importing a 85VMAX from USA… so if I need to fix something… now is the right time J
  16. Mr. Max

    Vboost cable adjusting

    I was working on a max and noticed, that I have quite a bit of freeplay in vboost cable, can that be tightened up somehow?? I've noticed before, that my vboost buzzes longer on a power-up than in videos that I have seen in youtube etc. It can be heard when servo pulls just freeplay and when it...
  17. vmax2extreme

    Vboost magazine revival?

    THE VMOA WANTS TO HEAR FROM YOU!!! TO VBOOST OR NOT TO VBOOST? Many people have expressed interests in the VBOOST magazine. We would like to hear from YOU, the vmax owners, if you would have interests of bringing the VBOOST magazine back alive as an online readers edition for a...
  18. B

    Vboost indicator ligbt

    I made this to show that the vboost was opening on acceleration. The arm on the vboost shaft hits the button on the switch completing the ground circut for the light. Switch came from eBay and the light from radio schack I drilled a hole in the bracket on the vboost to lineup with the arm on...
  19. S

    Vboost not working... how to troubleshoot?

    I recently rescued a 1986 Vmax from some young air force fellow who was moving overseas and more or less dumped it due to "engine problems." The "engine problems" were dirty carbs that were fixed using the shotgun approach listed in these forums (thank you very much), but I think the Vboost...
  20. T

    Inop VBoost

    I recently realized my VBoost was not opening up for me. Until I get the solenoid replaced I decided to leave the VBoost valves closed for the time being. However when I ride the bike now everything still feels the same as it did before I did any work to the boost. I still can hear a very...
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