Pilot jet and fuel filter

PlanetMinis Forums

Pilot jet and fuel filter

This is a discussion on Pilot jet and fuel filter within the Z50, CT70 and JDM Monkeybikes forums, part of the General Talk category; I might need to install a smaller pilot jet on my '93 ct 70. How do I find out what the stock size is? Also, ...

Results 1 to 8 of 8
  1. #1
    Senior Member
    This user has no status.
     
    Expygator's Avatar

    Join Date
    Jun 2012
    Location
    Nashville, TN. (Smyrna)
    Posts
    154

    Pilot jet and fuel filter

    I might need to install a smaller pilot jet on my '93 ct 70. How do I find out what the stock size is?

    Also, I do not have a fuel filter in line. I thought my carb had a filter in it? Am I wrong here?

    Thanks.
    Hidden Content
    1993 CT70, stock...919 miles

  2. #2
    Senior Member
    This user has no status.
     
    jamesfl's Avatar

    Join Date
    Dec 2016
    Posts
    182
    The stock size slow jet is #35 and I do not believe your carb has a filter.

  3. #3
    Senior Member
    This user has no status.
     
    Expygator's Avatar

    Join Date
    Jun 2012
    Location
    Nashville, TN. (Smyrna)
    Posts
    154
    Quote Originally Posted by jamesfl View Post
    The stock size slow jet is #35 and I do not believe your carb has a filter.
    Okay if stock is #35, what is the next smallest pilot jet?

    If I don't have an in line filter, do I really need one?


    Sent from my iPhone using Tapatalk
    Hidden Content
    1993 CT70, stock...919 miles

  4. Remove Advertisements
    PlanetMinis.com
    Advertisements
     

  5. #4
    Senior Member
    This user has no status.
     
    jamesfl's Avatar

    Join Date
    Dec 2016
    Posts
    182
    I don't know if they make smaller then #35 in that style.

    https://www.jetsrus.com/a_jet_kit_di..._070_CT70.html

    Perhaps trying Mike at jetsrus.com.

    As for "needing" an inline filter, no you don't but it probably won't hurt to have one and could help keep your pilot jet from clogging. I have 4 bikes without filters and 2 with.

    Curious as to why you need a smaller pilot then stock?

    Have you tried adjusting the air screw? Perhaps you can lean it out enough without search for a smaller pilot jet.

  6. #5
    Senior Member
    This user has no status.
     
    Expygator's Avatar

    Join Date
    Jun 2012
    Location
    Nashville, TN. (Smyrna)
    Posts
    154
    Quote Originally Posted by jamesfl View Post
    I don't know if they make smaller then #35 in that style.

    https://www.jetsrus.com/a_jet_kit_di..._070_CT70.html

    Perhaps trying Mike at jetsrus.com.

    As for "needing" an inline filter, no you don't but it probably won't hurt to have one and could help keep your pilot jet from clogging. I have 4 bikes without filters and 2 with.

    Curious as to why you need a smaller pilot then stock?

    Have you tried adjusting the air screw? Perhaps you can lean it out enough without search for a smaller pilot jet.
    I've been reading a tuning guide from a dependable source and it states that if your air screw is backed out 2.5 turns, you might consider a smaller pilot jet. Mine is 2.5 to 3 full turns out. And my spark plug is soot black. It's dry, but sooty. I just put a new plug in and haven't run it since. The old plug was black from a super rich issue that I had sorted. However even after cleaning the plug, it still gets sooty black. I want light brown/ tan. Where I live is hilly and winding so I need to be as close to perfect as possible to get the extra 0.00009 hp/tq so it can pull up these long hills.

    I will take your suggestion and check out jetsrus.com.

    Thanks!!


    Sent from my iPhone using Tapatalk
    Hidden Content
    1993 CT70, stock...919 miles

  7. #6
    Senior Member
    This user has no status.
     
    Expygator's Avatar

    Join Date
    Jun 2012
    Location
    Nashville, TN. (Smyrna)
    Posts
    154
    Quote Originally Posted by jamesfl View Post
    I don't know if they make smaller then #35 in that style.

    https://www.jetsrus.com/a_jet_kit_di..._070_CT70.html

    Perhaps trying Mike at jetsrus.com.

    As for "needing" an inline filter, no you don't but it probably won't hurt to have one and could help keep your pilot jet from clogging. I have 4 bikes without filters and 2 with.

    Curious as to why you need a smaller pilot then stock?

    Have you tried adjusting the air screw? Perhaps you can lean it out enough without search for a smaller pilot jet.
    It's also possible that through years of cleaning the jets that the holes have become larger.


    Sent from my iPhone using Tapatalk
    Hidden Content
    1993 CT70, stock...919 miles

  8. #7
    Senior Member
    This user has no status.
     
    jamesfl's Avatar

    Join Date
    Dec 2016
    Posts
    182
    I think that would be highly unlikely, but I guess it would really depend on how you clean your pilot jet. Carb cleaner and compress year = no, small drill bit = possible.

  9. #8
    Senior Member
    This user has no status.
     
    Expygator's Avatar

    Join Date
    Jun 2012
    Location
    Nashville, TN. (Smyrna)
    Posts
    154
    Quote Originally Posted by jamesfl View Post
    I think that would be highly unlikely, but I guess it would really depend on how you clean your pilot jet. Carb cleaner and compress year = no, small drill bit = possible.
    My dad a I have always used either piano wire or a single wire bristle from a wire brush.
    Hidden Content
    1993 CT70, stock...919 miles

Sponsored Links

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  

Similar Threads

  1. vm 26 pilot jet
    By crwdirtyj in forum Chinese/Import Minis - General Discussion
    Replies: 2
    Last Post: 04-27-2010, 03:31 PM
  2. pilot jet ?
    By dbking321 in forum CRF50
    Replies: 9
    Last Post: 08-09-2009, 04:58 PM
  3. I need pilot jet
    By RYDERED in forum Z50, CT70 and JDM Monkeybikes
    Replies: 5
    Last Post: 04-08-2009, 04:21 PM
  4. Need Main jet and pilot jet
    By mike307 in forum CRF50/CRF70 Parts For Sale
    Replies: 0
    Last Post: 10-19-2006, 06:15 PM

» Log in

User Name:

Password:

Not a member yet?
Register Now!

» Sponsored Links

Powered by vBadvanced CMPS v4.3.0