Possible HT lead problem?

Discussion in 'The Workshop' started by pow, May 18, 2008.

  1. pow

    pow New Member

    Messages:
    140
    This is for a friend- Aerox, mhr 70 kit

    The bike will run fine on the stand but as soon as the back wheel is on the floor its no good.
    When pulling off under hard acceleration and also when moving giving full throttle the bike bogs.
    The carb isnt setup 100% but this problem just appeared asif something is breaking down.

    The bike has had a new spark plug and the red ngk ht cap.
    The end of the ht lead was pretty chewed so cut off about 1cm to give some fresh wire.

    Should he be looking at trying a new ht lead/coil?
     
  2. WOLFFY

    WOLFFY New Member

    Messages:
    4,135
    Rides:
    Runner 172
    So that is his setup... a aerox with a MHR 70 kit..... :msn1:
     
  3. capri dave

    capri dave Active Member

    Messages:
    5,076
    if the bike is bogging down and the carb is known to be not set up properly...

    mmm should you be looking to replace the cdi....thats a tricky one that!!!

    :pimp:
     
  4. pow

    pow New Member

    Messages:
    140
    Wolffy- Thought this was a useful bit of info as it refers to the state of tune but heres the specs

    mhr 70 kit
    Hebo crank
    21mm delorto carb
    leovince zx exhuast
    polini 2g clutch and blue contra spring.

    Dave- Im thinking its the ht lead as when the engine is under acceleration, the engine will pull on the ht lead. The bike was running about 90-95% complete with no bogging and only little tweeks needed
     
  5. capri dave

    capri dave Active Member

    Messages:
    5,076
    if the engine is pulling on the HT lead under load then that needs looking at!!

    and secondly a zx pipe with that set up :msn1:

    please tell me its temporary untill he can afford something better....
     
  6. Dec

    Dec Active Member

    Messages:
    3,183
    Rides:
    nothing ugm
    which mhr kit is it exactly???
    rep?
    speed?
    team?
    cross?
    50?
    etc..
     
  7. pow

    pow New Member

    Messages:
    140
    The pipe is temporary hopefully getting a yasuni c20 or thereabout

    Im not sure what kit it is exactly but I no its no a rep. its a single ring ali kit
     
  8. alexsr70

    alexsr70 New Member

    Messages:
    2,039
    well the carbs too small and the exhaust is way off for a kit like that

    and it ent gona help, BUT you said it ran ok before well youve obviously changed something.

    sort the ht lead out asap if you think it may be a problem, its cheap anyway.

    what rollers you got in there?? cos if it revs fine on the stand then its obviously tranny related

    oh and is it running an open filter?
     
  9. pow

    pow New Member

    Messages:
    140
    the airbox has been drilled and then fitted with a malossi filter
    Its not roller related as its only since a new cap has been fitted

    any ideas where I could get the head lead from as it looks asif its attached to the coil?
     
  10. pow

    pow New Member

    Messages:
    140
    Ok fitted a different coil and lead and exactly the same problem.
    Its kind of a missfire throughout all the speed range but when the throttle is decreased slightly its fine.

    A few things I mentioned to him was drain the carb and check the jets
    check the variator and rollers
    clean the spark plug hole in the cylinder
    check the clutch and belt

    The clutch bell has started to discolor quite badly what effects could this have?
     
  11. capri dave

    capri dave Active Member

    Messages:
    5,076
    if the running improves when the throttle is decreased a little that is a sure sign the mainjet is incorrect ;)
     
  12. pow

    pow New Member

    Messages:
    140
    The thing that baffles me though is that the carb has not been touched lately?
     
  13. SimonT

    SimonT New Member

    Messages:
    601
    has he touched the rollers?

    they may be too heavy?
     
  14. pow

    pow New Member

    Messages:
    140
    The only thing that had changed was the spark plug cap.

    The clutch bell is discolouring what symptoms can this give
     
  15. pow

    pow New Member

    Messages:
    140
    Turns out part of a reed snapped off slightly :wtf:
     

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