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Offline Dakotarider

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shifts hard
« on: August 16, 2017, 11:32:58 AM »
Trying to get the 78 cb750k to shift more smoothly.  Currently, it takes more toe effort than I'm used to to shift gears.  It's causing me to occasionally miss gears if I'm not really aggressive on the upshift especially from first to second.  Just got this bike on the road and would like it easier to ride.
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If one bike is good, three is better!

Offline flybox1

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Re: shifts hard
« Reply #1 on: August 16, 2017, 11:38:56 AM »
Proper cable adjustment at both ends?
Oil designed for wet clutches?
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'78 750K (F3 engine) PD42b's, Modified airbox w/K&N  filter, 40/110 jets, 1 needle shim, IMS@ 1 turn out. Kerker + Cone 18" QuietCore

Past Bikes
1974 550K0 (stock), 1973 CB350F (stock), 1983 Yamaha XS400K (POS)
77/78 cool 2 member #3
"Knowledge without mileage equals bullsh!t" - Henry Rollins

"This is my CB. There are many like it, but this one is mine…"

Offline markreimer

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Re: shifts hard
« Reply #2 on: August 16, 2017, 03:38:03 PM »
How old is the oil? Agreed with above, start with clutch basket adjustment, the cable adjustment. What oil are you using? My 750 k4 shifted poorly as the oil got older. But it also never really shifted wel until I did hondaman's clutch mod, rebuild the oil pump and replaced the seals suppliants oil to the shift mechanism. Now it's buttery smooth


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Offline Dakotarider

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Re: shifts hard
« Reply #3 on: August 17, 2017, 06:01:29 AM »
I am using honda 10w 40 and it is fresh changed.  My cable at the clutch lever has a just a little slack in it.  I have not adjusted the clutch basket.  I'll start there.
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Offline Knightro

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Re: shifts hard
« Reply #4 on: August 17, 2017, 06:19:27 AM »
My 78 750 was shifting hard and slipping a gift too.  It's hot here in summer and the hotter it got the more it slipped.    I put Castro motorcycle oil for wet clutch like the type shown here but used 20w 50..... Never had a problem shifting again. 
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1982 920 Virago.... long sold
1982 cb900f. In progress
1978 GS750
1978 CB750K
1978 cb550

"If it aint broke don't fix it!" but if it's working, take it apart so when it is broke, you know what your doing...  we'll see how much $ this theory will cost me. lol

Offline Knightro

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Re: shifts hard
« Reply #5 on: August 24, 2017, 02:44:16 PM »
Just a heads up on this oil... here in Manitoba our temps went down to 15 deg Celsius  (59 F) yesterday and my bike took about 30 minutes to 'warm up' for obvious reasons. It definately doesn't take long to warm up in that temp with recommended oil.  So to be clear, using this oil is a 'my engine is hot, the weather is hot, my trans slips and is hard to shift out of neutral' solution... it is not a fix all solution for these bikes.  Also, if trans issues persist... it's probably more than just oil.

The trans tends to get a little fickle when it is very hot or when the oil is old... so if you are running in cooler weather and you are having this problem, then the oil might not be the issue or at least, the thickness may not be the issue, you may just need new oil or trans work...

Not getting into a debate here about oil... that's been beat'n to death.
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1982 920 Virago.... long sold
1982 cb900f. In progress
1978 GS750
1978 CB750K
1978 cb550

"If it aint broke don't fix it!" but if it's working, take it apart so when it is broke, you know what your doing...  we'll see how much $ this theory will cost me. lol
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