Warming Up 78 CB750F

[Rockwork]

Hey, is it normal for the 78 cb750f to take about 10 minutes to warm up?

When I start mine I have to warm it up for about 5 min at 2K to 3K rpm before going into traffic (in NYC), and it takes about another 5 min before it's fully reliable.

[TOOLS1]

They are cold blooded, but that is a bit excessive. Your pilot jets might be a little dirty.
TOOLS

[LASERTURTLE]

mine was the around the same time frame in order to warm up and the same rpms , once i change out the spark plugs to new iridium plug it ran alot smoother all around, including warm up time and idle speed (just food for thought simple change help me out a bunch ) good luck

[shinyribs]

Tools is right. They are cold blooded, but not that much.  Mine is good to go in a minute or two tops. In cold weather, below 40* F, it might take a couple miles before its fully warmed up.

[Rockwork]

WOW!!! Changed the plugs to iridium today and the difference is incredible. I thought it was smooth before, now it purrs when it idles and roars when it revs. I can't wait to see how it warms up in the morning.

Thanks again. I'm eternally grateful.

[fordsparky]

i am curious to know how this pans out, my '79 cb750 does almost the same...full choke starts easily, half choke to gear up (helmet), then ride easy for 3 blocks, now she's awake and stops embarrassing me with the missing/popping on acceleration.

[Rockwork]

Warmup was a whole new experience this morning: 2 minutes and I was on the road; 5 minutes and doing whatever I wanted.

I got the iridium spark plugs at Motorcycle Superstore for $10 a piece. They're pricier, but the convenience and performance is worth it, and I'm looking forward to what it does for gas mileage.

[Rockwork]

To bring closure to this episode, as of last week my bike only takes about a minute to be ready to take off.

Even after installing the iridium plugs it was continuing to take awhile to warm up, especially when it was below 60 degrees outside.

But last week I finally changed a sluggish choke cable, which has made a big difference in performance all around. Evidently, the choke cable was inhibiting the baffles from properly opening and closing.

[Re-run]

I could see the choke cable doing some of this. I use the d8ea plugs(stock) and on cold mornings I start with barely a push of the starter and idle for a probably less than a minute and then ride. I take it easy but by the time I go about a mile, it is ready to rock.

I will say that when I still used the points, it did take longer. I switched to the dyna S and there was a big improvement. I got almost instantaneous starts, better mpg, and a slight seat of the pants power increase. The dyna allows the coils to saturate better for stronger spark. The reason the iridiums work better is that they make more efficient use of spark energy, thus working better with the points than the old copper plugs do.

Though I would use the pamco instead of the dyna now. The pamco is an excellent ignition system. The optical system from cyclex is very good too.

I do keep my points plate though, just in case. The primary draw of points is reliability and road side repair, though if a rubbing block breaks off, you are SOL.