ultima 113 evo style

[tc1550]

my friend bent 2 front psh rods high rpm over rev  installed new ones all good
did compresson test same both cylenders bike wont idle billowing black smoke low rpm did i miss any thing no popping or back firing .
seems loaded up both plugs black real rich i think carb problem is it coinsidence or keep looking front cylender thanks

[choseneasy]

Check the throttle plate real close. If she backfired a few times chances are the shaft may be bent. What type of carb? I  found an S&S carb that did this when a rocker arm broke on a bike. Worth looking at.

[JohnS_Rosamond]

OIl smoke tends to be a misty blue (and you can sometimes smell the oil).  Over rich condition tends to put out a more black smoke (and there'll be a strong gasoline smell).  I would guess that something has happened to your carb (.. carb right?  no EFi?)  Check that jets are not loose and that you're getting full range of motion on the throttle wheel and that throttle moves freely.  Also check the choke mechanism.  On CV it's possible to partially pull the choke cable out of it's sleeve so that the choke remains on even if the choke knob is pushed in all the way.  Good Luck.

[PaJoe]

Our stock Ultima 113 came with a 45mm Mikuni carb and the manual does warn about being careful when routing the choke cable as it can stick partially open. I prefer and use a CV choke cable rather than the Mikuni on/off choke on my 45mm Mikuni and really did not spend much time using the Mikuni choke cable but seem to remember reading the Mikuni choke cable has an adjustment to help make sure it is off when pushed in.

[BB]

My question is how do you bend both push rod on a over rev and not bend valves or cause head damage? If carb was ok before the bent push rods , you might look at valve train problems.

[speed limit]

Sounds like bent valves to me

[tc1550]

thanks guys carb throttle shaft bent problem solved no valve train issues

[prodrag1320]

push rods are not going to bend from over reving,valves hitting valves or pistons from over reving will bend push rods