show prep, part 1

Getting my bike ready for the Stafford Bike Show is actually a little daunting, to be judged and compared against so many amazing bikes makes you second guess everything. My bike genuinely looks great but I can see faults everywhere, stuff you wouldn't notice or see, but I see.... 

First off is a good clean,

Secondly the tyre pressure warning decal turned up

Next I removed the front wheel to give it a proper clean behind the spokes, but getting into the tightest point near the rim proved very difficult.

Next I used some old petrol and a tooth brush which seemed to work.

My bike - show ready?

 I have recently applied for a private entry for the Stafford Classic Bike Show in October, fingers crossed I get accepted but regardless of if I do it is good motivation to finish a few niggling jobs.

Here is my to-do list to get my bike show ready.

1/ replace the handle bar clamp screws for Olive green bolts - CMS

2/ add tank warning decal - CMS 

3/ add chain adjustment warning sticker - ebay

4/ replace broken RH mirror, unfortunately this cracked when I moved the mirror - do you know of any NOS Honda mirrors?????

5/ Fit a NOS fender part

6/ Maybe - buy a new rear fender - mine is very, very good but I've seen a NOS one :-) Honda M Serie shop

7/ New tyres - again maybe just to put a final finish a new pair of tyres would be good.

So, all in all, not masses, but just some small things to make the bike the best it could be!

My bike; Instagram star!

 My MBX80 was picked up and used in Classic Bike Shows Instagram post, check out their account here. Hopefully this year it will be at the Stafford show 14-15th October! 

Farewell MB8

 Its time to say fair well to the little MB8 and it's now sold. It genuinely was a lovely bike and to be honest I'm a little gutted to let it go but as it didn't really need restoring it had to go to make room and fund another restoration project. It's gone to a good home :-) 

Auf Wiedersehen mein deutscher freund!

'the noise' part 2

 The next thing I looked at was the tacho drive, this is a worm style gear and runs at 90 degrees against the corresponding gear on the end of the idler shaft.

The tacho gear seemed to have an excessive amount of vertical play, suggesting the noise could be this gear vibrating up and down? The gear has an upper and lower washer, which the manual highlights to remember to reinstall and an oil seal, which was super hard.

As a test I rebuilt the side case and refilled the fluids without the gear, I cut a rubber finger of my workshop gloves to cover the tacho gear drive hole just in case something went in the motor or oil came out.

I have compiled some clips with various stages to focus on what was the rattle or what is just standard engine noise. I also recorded my MB8 for an engine noise comparison but I didn't include that in the vid, so just MBX.

'the noise' part 1

When I originally bought my bike it had an annoying engine rattle, I actually just put it down to an old bike and maybe a little end bearing? 

I wanted the engine fully re-built with a re-bore and this was done via our friends at the M Shop. While the engine was away it had all new bearings and seals as well as the piston, clutch, carb and external finishing. 

When the bike was built and the engine in you can here the engine is smooth, but 'the noise' was still there.

At this point I was not concerned until the kick starter shaft snapped and it got my thinking about replacing any suspected gears and cogs that might cause the rattle. Read about that here 

After that rebuild I anxiously started the bike and the rattle was still there, again I parked it up and thought I would do some more investigating in the new year.

At this point I thought I would speak to the M Shop to quiz them to what they thought was the issue, I'll add I was not implying or blaming them for the continued noise as it was there before re-build and was something weird and not covered by the engine rebuild. The M Shop were as usual very helpful and gave me a few suggestions to look and even offered to have the motor back. 

So the bike came apart again...

clutch removed

water pump bush

idler shaft

So the first thing is the water pump bush is broken and the M shop advised to look at the shat and teeth of the idler shaft. I ordered in the replacement bushing and managed to borrow a idler and water pump shaft just to check and eliminate.

With the bike re-built and started the noise was still there....

idler shaft inspection limits

what's in the RH crank caase

Water pump parts

fuel tank warning stickers

 The finishing touches can make or break a restoration and although my fuel tank was a 'new old stock' tank it lacked the warning labels so it is something I definitely want to add. The first thing I needed to know was which labels are on there as I cannot remember my original bike and the positioning of them. I put a request out on the M Classic Facebook post and Tony and Steve from www.mb5.co.uk quickly stepped up to help with a decent top image and all the dimensions.

The next issue is sourcing the decals, the middle decal on the bellow image seems readily available but the top and bottom decals seem to be discontinued? If anybody can point me in the right direction for these I would appreciate it?

Brochure: MBX80 what if?

What if Honda kept making the MBX80 in 1989/90 what would the brochure look like? Just for fun here is my interpretation in the style of the late 80's marketing department using the NS125R brochure for inspiration, what do you think?

inspired by... 

My bike: Tidy up small items

 As with all projects you always have an extensive list of stuff you want to change, maybe its things nobody else will ever see but just bug the cr@p out of you. While I was ordering from CMSNL I took the time to order a couple of those annoying parts.

2 x replacement screws for the speedo fascia

1 x replacement drum brake rocker arm, bolt and nut.

1 x wear indicator and felt.

All small stuff, but progress!

before

after

 

My bike: kick start rebuild

 Ouch... I routinely roll the MBX out the garage, fuel tap on, choke on, foot peg up and prod the kickstarter and snap, the kick start shaft snaps clean against the crank case and takes a little bit of leg with it.

Looking at the owners manual its not a massive job and the kick start shaft can be replaced with the engine in. Also in the owners manual it states that there are service limits not only on the shaft (6) but also the idler gear (2), inspection on the oil pump gear (1) and both kick start springs (8 and 5), so I decided to replace the lot including the collar (9), ratchet (4) and ratchet gear (3).

For availability all parts were bought via David Silver Spares and CMSNL

On to the repair...

First drain both the coolant and gearbox oil. Tip, remove the rad filler cap!

Remove the rev counter cable and clutch cable and remove the right hand side cover. Tip: pay attention to the clutch actuator pusher on the inside of the case!

To just do the kick start shaft you don't have to remove the clutch, but as I needed to replace all the gears the clutch had to come off. NOTE: If you do take the clutch off the balancer shaft does need to be timed to the primery - see bottom of the page!

plastic oil pump gear, check for wear and tear.

To re-fit the new idler gear you will have to remove the ratchet plate 

Refitting the kick start shaft and getting the spring tension can be testing... 

Don't scrimp and fit a new gasket

Ratchet assembly, next is to get the correct clocking and spring tension. 

here is the clocking and alignment from the manual.

FWD-F: Twin disc UK 2nd gen model

I while back I had a conversation on our facebook page with an ex-owner who said he had a MK 2 MBX80 (rainbow) bike that was UK specification complete with twin discs. At the time I thought this was super interesting as I knew Honda only brought in the original MK 1 model in black and white for a couple of years, so what could this MK2 be?

The guy mentioned the dealer, Rustys in Scunthorpe and they just so happened to be a customer of mine so I reached out to them to see if they remembered selling the bike, keep in mind this would be 35 years ago. They mentioned they remember selling little Honda's but couldn't pin down any specifics, so I just chalked it down as interesting but without a bike I just had to take the guys word for it.

Fast forward to 2020 and I was contacted by a chap called Mark Roberts who had a UK MK2 bike. Better still the history of the bike is complete, first registered in 1986 on a D plate it was bought from The Honda Centre in Old Colwyn North Wales (now Colwyn Bay Motorcycles). Mark bought the bike in 89, subsequently sold it to a family member then bought it back it now stored and waiting for a light restoration. Apparently there were a few bikes kicking round North Wales which leads me to believe Honda imported a few bikes in 86 for a few specific dealers (like Rustys) who saw there was a demand for the bike but never included it in the official range.

What ever the full story was from Honda we may never know as Honda never nationally promoted the model and it didn't appear in any literature, but seeing some genuine UK MK 2 bikes makes for an interesting foot note in the models history.

Thank you to Mark Roberts for helping fill the gaps in this story and sharing your bike!

According to the parts listing on CMSNL this model is designated FWD-F and as a 1985 model, view the spare parts here: