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Messages - pewe

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1
CB750 / Re: CAN'T FIND NEUTRAL WHEN HOT
« on: April 07, 2020, 07:01:04 AM »
Then you'll get the harder gearbox, problems finding neutral while bike is standing still.
Check the other forum where Hondaman explains 10W-40 history for CB750, why it is mentioned on the sticker.

I'm sure you have higher temp than I have in Sweden ;)
Yesterday was OK riding weather!

The old UK bikes runs with straight 50, right?

2
CB750 / Re: CAN'T FIND NEUTRAL WHEN HOT
« on: April 06, 2020, 07:07:09 PM »
Finding neutral when engine is hot is one way for me to  verify the oil to be OK for the engine.

All 10W-40 oils I have used cause very hard an mechanical gear shifting. I used those for break in only.

CB750 should use 20W-50. I think that 10W-40 was for colder temperature, max 15C.

I have tested Motul 5100 15W-50 semi. Better than Motul 20W-50 mineral and much better gearbox feeling than Motul 10W-40 mineral. Castrol 10W-40 mineral also very hard gearbox.

Motul 7100 10W-50, even better.
Red Line 20W-50, best so far.
This in my K6.

Spectro Heavy Duty 20W-50 mineral caused sticky clutch. Out with 1L and in with Q8 SBK racing 10W-50 (cheap synth) made it really good. Gears shift very smooth!
In my K2.

Both Red Line and Spectro have high amounts of zinc and phosporous.

I have ordered Eurol Harley Davidson 20W-50 oil that is very cheap. It cannot be high quality synth as Motul 7100/300 or Red Line (esthers) but well worth to be tested. The gearbox when hit will tell! ;)

I have done my own semi by mixing 2 Spectro 20W-50 mineral, 2 SBK racing and 1 Red Line 20W-60 to be used in My K2 stock spec.

The latter for my K6 summer 2018 where we had over 30C during a long period of time. I ordered a box of 20W-60 to my hotter running K6 with 1000cc Billet block.

I'm convinced that CB750 run well on V-Twin 20W-50 JASO MA oils.

3
Recommended Sources for Parts and Services / Re: Timing Light
« on: September 02, 2019, 08:07:27 AM »
If you have a spare battery, connect the strobe lamp to it instead of connecting to the bikes battery under seat making cables tensed. Seat can fall down and cause problems when checking F @ idle as well as when full advance kick in.

I use a cheap strobe lamp from eBay. Orange colored plastic.

An auto multimeter with dwell function an easy way to make both points gap equal at high idle and make the engine to run really smooth and even with minimum of rattle.

4
CB750 / Re: swingarm needle/roller bearings
« on: September 01, 2019, 03:57:12 PM »
Andy Cepok on eBay.de sells needle bearing kits as many others. I have used that on my CB750 K6 since many years, at least 70.000 km without any issues. My K2 got it too earlier this year.

5
CB750 / Re: Can't removal rotor
« on: March 05, 2017, 03:19:37 PM »
I used a cheap electric wheel impact wrench. In the £40 segment.
I had the crank on a thick plank of wood, a friend was standing on the crank. I let the impact wrench work with the alternator removal bolt for at least 20 sec until the alternator flew off. The bolt was fastened with Loctite when crank was refurbished and alternator lightened back in the early 80's.

I used loctite and wheel impact wrench when assemble it

6
CB750 / Re: CB750 PRIMARY CHAINS
« on: January 27, 2016, 02:10:19 PM »
CycleX in USA and Classic City Cycles in Germany offer heavy duty primary chains. These have been discussed in the other SOHC forum.

7
New Member Introductions / Re: Hello from Sweden
« on: January 27, 2016, 02:06:27 PM »
Thnaks for the welcome Mick, and yes I still have the bike, Steve.
Can´t imagine ever selling it  :)

Just hoping that more time will come that I can spend riding and wrencing on it....

As you perhaps remember from .net I had plans to get the head ported back in 2007. Sadly the fellow (P.A. Pettersson) that would do the work passed away suddenly and it all came to a stop. Not easy find reputable guys that has experience of porting an old 750 head anymore. Talked to Mike Rieck but at the time I felt that the cost of sending the head to the US and back again plus the cost of the work would be too much... And the risk of getting the head damaged or lost in transport also put me off :-\

Is there anyone in the UK that you know of and can recommend for doing work on a CB750-head?

You might have found where to port the head...
MotoSpeed in Västerås Sweden did very good port jobs on CB750 heads back in the 70-80's and still do it!
I got my CB750 head ported 1983, same head restored spring 2014 by same guy. I have new plans for same head so he will  have more to do.

8
CB750 / Re: Yamiya Bodywork.
« on: April 24, 2015, 07:54:59 PM »
I purchased tank and side covers from Yamiya750. 750 Four, HONDA badges too.
The quality is 100%. Perfect paint job, new tank, no scratches at all. They ship the parts very safe and quick as well.
I have not mounted my parts yet. Tank, side covers + new 4-4.  I have ordered other parts too, always good.
Repair an old tank is not cheap either.

The small parts have to be ordered too that will add some $.
Petcock, lower tank trims, Honda badges + fasteners, fuel cap + pins, Sidecover badges, yellow/orange HM diamonds. OEM look better with the small detail with hm in the logo for not much more than the replica versions

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