Author Topic: Cylinder's #2 not heating up @ idle..I know...I know...similar question's asked  (Read 1483 times)

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Offline cb750-bobber

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OK,
  I know this question has many variations and has been answered, but I couldn't find the same question with the answers I need.
   Alrighty,
         I have the non-bottle top carbs, uni foam pods, MAC drag pipes, carbs professionally rebuilt and sync'd by microbore in Syracuse NY. Bike starts with throttle applied, cylindars 3/4 heat right up, #1 pops in and out #2 runs cold until you hammer on the throttle, I eliminated the tach so I can't answer that question..lol..As soon as I PULL(has a pull choke set up) the choke on 1/2 cylinders kick in full force. SO question one, if it is plugged "slow jets" which seem to be a reoccuring word here on SOHC, where the heck are thay, and how do I acess them on these oddly engineered carbs, I've torn apart the bottle cap style, and many others with the same simple design, but these looks tamperproof...any help would be greatly appreciated, thank you in advance.

Offline Spanner 1

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I'd ask for my money back...about the carb rebuilt/sync'ed.... actually the carbs prolly came out of the shop 100%, but rust/gunk in your tank got down in there and messed-up your slow jets..... need to pull them( slow jets) and examine/clean IMO... If you care to undo the 4 screws on each bowl the main and slow jet will be apparent.... the slow jet is the off-set-from-center smaller one. Grip it with a pliers and twist and pull to remove ( dentist style ! ). check the jet for daylight; caution; degree of difficulity = difficult ;D.. V.hard to see thru' even if clean.... also cross holes in upper jet, clear?.... satisfied, tap the jet back in, close-up bowl, test, ride!
If your sure it's a carb problem; it's ignition,
If your sure it's an ignition problem; it's carbs....

Offline camelman

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Points, condensers, trim the ends of the wires, and verify your carb boots are good.  Timing, dwell (or gap), and watch the points to see if they are arcing when the engine is running.

I just went through all this again with a CB450.  The rest of these bikes are easy and straight forward.  It is the ignition that gets you.

Camelman
1972 350f rider: sold
1972 350f/466f cafe: for sale
1977 CB400f cafe:sold
1975 CB400f rider: sold
1970 CB750 K0 complete bike: sold
2005 Triumph Sprint ST 1050 rider

We've got to cut it off... and then come down on rockets.  (quoted from: seven minutes of terror)

Offline cb750-bobber

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Thank you gentleman, I will investigate tonight.

Offline cb750-bobber

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Welp,

    Slow jet #2 was partially obstructed! well done team Honda, thanks for your help, Now the bike was ridden, and it's obvious that the 2k post in regards to pods and MAC exhausts will apply to me...Anyone selling 150/155/160 main jets??