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Topics - xpd153

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When I tried to replace ordinary lamp with LED at Honda NX650, it did not work with IC flasher relay.
Because NX650 turn signal indicator socket has reverse connection. It means side is + and bottom is -.

Ordinary light does not matter it. But LED has polarity. It matters.

The latest incident is, dysfunction of posting and sending PM. But viewing article,stat and member list has no problem.

Therefore, we need sub-forum for posting test article. But we have to expect spammers may use this sub-forum.

According to my memory, simplemachine forum has a config that automatic deleting articles in sub-forum.

All Technical Issues / Starter relay
« on: October 17, 2020, 06:27:00 AM »
Recently I experienced starter relay problem at Futura. And I fixed it.

Then  I checked RC27's starter relay today.

At off, there is 5.5M ohm between B and M terminal.
At on, there is 1.7M ohm between B and M terminal.

I decided to dump this starter relay even RC27 did not have starting problem. I was not satisfied with sound of the starter.
I ordered cheap compatible parts to China. Because Futura has no problem and time is on my side winky5a

For the reference, I described about pin assigments of control terminal.

                         1            2
                         3            4
                   |                         |
                   |     M           B   |
                   |                         |
                   |                         |

1 and 2 are NC
3 = 12V
 4 =GND
 For testing, you need regulated DC supply.

What does this banner mean? It is assigned to users without own banner.

According to my memory,most resemblance picture is a paint about woman's hip on the door of toilet room in U-Boat  by  German movie Das Boot.  But I think this  does have different meaning smile1004hmmsz

All Technical Issues / RC27's bad cowl design
« on: August 01, 2020, 09:53:00 AM »
As you know, RC27 is 1st generation full covered cowl design motorcycle for consumers. Therefore, Honda did not understand how to design plasticky cowl parts at that time.

 Please see attached photo. Red arrow pointed parts are problematic. Because nut clip is attached under layer plastic.
However, bolt and nut clip are tightly bonded due to aging. Therefore, you have to coat engine oil,copper grease or thread compound to the bolt for preventing from fixation.

 If you apply rotating force to the bolt, it may result destruction of under layer plastics.

Why did I say this? Because I experienced the problem.

I also have Futura, Italian full covered design motorcycle, but its design time was about 10 years later. And it does not have such problematic points. And Aprilia's nut clip has shallow hole. But RC27's nut clip has deep bolt hole and prone to cause fixation.

Even youngest RC27 is already 32 years old. All plastic cowl part became fragile and can not accept large force. Please be careful.

If you have deep pocket, maybe still some cowl parts are available from Honda parts network.
Or if you have big 3D printer, you can make parts by yourself.

All Technical Issues / 17/45 sprocket config has no problem
« on: July 23, 2020, 03:06:18 AM »
I switched to 17/45 sprocket config. And did not find any problem.
When Honda made RC27 in 1987, motorcycles' legal upper speed limit in Japan was 80km/H.

So basically genuine sprocket config(final reduction ratio) is too high.(It means too low geared).
As I mentioned in other thread, driven sprocket(rear) has a few selection. But drive sprocket(front) has wider selection.

So I can recommend replacing drive sprocket if your country's regulation for upper speed limit is more than 100km/H.

All Technical Issues / Threadlocker
« on: July 17, 2020, 14:36:43 PM »
One of distinctive difference in Honda CBR750 manual is, no description about particular threadlocker brand.

In Aprilia, Hurley Davidsson and other MC vendors, assigned Loctite xxx as threadlocker.

Today, I dismantled rear disc rotor. I found its bolts are coated by green threadlocker. Loctite also has green threadlocker but it is very special one.
So, it looks like Honda used Threebond 1401b threadlocker for assembiling RC27 rear disc rotor.

Loctite is quite expensive and Threebond has very reasonable price.

Bikers Cafe / Ronin
« on: July 13, 2020, 02:30:11 AM »
One of my favorite youtube channel is (Itchy boots).

Dutch female motorcyclist is travelling the world.
At season 1, she toured India,Myanmar,Thai,Malaysia,Oman,UAE, Iran, central asia countries, Turky, Greece,Serbia, Austria,Germany and Netherlands.
At season 2, Argentina,Chille, Bolivia and Peru. At Peru, she was locked due to COVID-19.

 So she returned to Netherlands without her Royal Enfield Himalayan. Because she could not arrage motorcycle transportation. Her Himalayan is stored at somewhere in Lima.

 She decided to tour some European countris. For that purpose, she bought Honda CB500X 2019 year model. That is excellent choice.
Then she requested her new motorcycle's name to youtube viewers.

 And there were many Japanese name candidates because of Honda.
 Finally she choose Ronin. (浪人)

 Before her name selection,I told her. Ronin has some negative meaning and not so good as her motorcycle name.

 In the case you may want to name your motorcycle, I offered some anaylysis about Ronin.

a) Ronin is a samurai without master
b) In later Tokugawa era, samurai was no longer warrior. Because there was no war. All control class were samurai. However, sometimes Daimyo(Samurai's master) was destroyed by Tokugawa shogunate due to several reasons. When Daimyo was destroyed, his subordinates(samurai) became Ronin. So he and his family did not get paycheck anymore.  He had a few options. Get new master(quite difficult) , change class(Farmer, Merchant or Craftsman) or bandit.
c) In modern days, there are two meanings. In this case, female Ronin exists.
c1) If you failed college entrance examination, you are student without college/univ. You have to try next year examination for getting college/univ. You are a Ronin.
c2) If your employer is out of business or you are simply fired, you are not self emplyed and have no employer. You have to get new employer(master). You are a Ronin.
d) In feudal Japan, all Ronin were male. Never female.

 So you must consider these things before naming Ronin to your Japanese motorcycle smile1004yes
And please don't call 'her'. Female Ronin did not exist in original meaning.
Anyway, the story of Norary(Itchy Boots) and Ronin will begin soon. Probably Nordic countries touring.

All Technical Issues / Wheel bearings
« on: June 30, 2020, 14:41:40 PM »
My RC27(45,000km clock) will get new chain, new wheel bearings and new drive/driven sprockets within a couple of weeks.

So I would like to ask you, robvangulik. Your SC21 recorded over 300,000 km clock.

How many times have you replaced F/R wheel bearings on your SC21?

One of merit by having multiple motorcycles is, you can compare its feelings between them.

In my case, Futura has less friction and CBR has more friction at coasting.

All Technical Issues / Compatible driven sprocket
« on: June 23, 2020, 05:32:00 AM »
There are wrong compatible info regarding CBR750 driven sprocket.

All CBR750 driven sprocket has four holes. However, AFAM, XAM and other vendors believe CBR750 sprocket has five holes. Don't buy their story and products. They are so idiots.

 Honda discontinued CBR750 driven sprocket. Therefore you can not order genuine parts to Honda parts network.

 Ath this point, JTR284 is compatible with original CBR750 wheel that I know. JT site has exactly diagram.

 Of course, you can switch to compatible rear wheel for more wider selection of driven sprocket.

All Technical Issues / has CBR750 data
« on: June 22, 2020, 11:30:08 AM »
Finally, has CBR750 data.

If you change sprockets or chain, that site may be useful.

I think original Honda config(15T/45T) is too low geared. But I am still using original config.

All Technical Issues / GPS/Smartphone mount
« on: May 04, 2020, 02:31:52 AM »
Recently I installed Chinese fork stem mount for GPS. It is cheap. But it works. You can buy this at pls search '
motorcycle fork stem mount' at

But you need 1mm thick rubber sheet. Because CBR750 fork stem hole's diameter is 19mm. But diameter of that mounter is 17mm.

All Technical Issues / Front brake cleaning again
« on: April 04, 2020, 13:38:40 PM »
Last time, I cleaned front and rear brake caliper cleaning in Nov 2016. And then I felt dragging in Mar 2020.
About one week ago, I cleaned them again. A couple of days ago, I ran CBR750 again but there was some dragging.
At last cleaning, I forgot using red rubber grease.
Today, I dismantled front left caliper and coated red rubber crease on the piston.
Tomorrow, I will assemble front left caliper and expect everyting fine.

At this point, there is no curfew in Japan. Weather is wonderful. Due to insufficient SARS-COV-2 testing, everybody have doubt about Japanese government's status report of COVID-19(only 2xxx people infected).


Bikers Cafe / Why robvangulik and xpd153 don't buy new motorcycles?
« on: November 09, 2019, 08:52:34 AM »
The reasons are revealed in different thread.

Scotty Kilmer also said 'Why car guys don't buy new cars' at following video.

All Technical Issues / Spark plug type
« on: November 03, 2019, 00:24:04 AM »
I found strange descriptions at Denso and NGK site.

At Denso.
CBR750F                                           X24ES-U           IX24
CBR750 SuperAero                          X24EP-U9         IX24B

CBR750F                                            DPR8EA-9        DPR8EIX-9
CBR750 SuperAero                           DP8EA-9           DPR8EIX-9

 Left plug type is regular. Right plug type is premium Iridium.

 We know 1988 CBR750 dropped 'SuperAero' naming due to unknown reason. But also know Honda called it   CBR750F no matter how production year is.

 As far as I know, there is no difference between 1987 model and 1988 model regarding ignition system.
 It looks like original CBR750FH has non register type plug. Then Honda switched register type plug at FJ.

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