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Honda H100 SJ Questions

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WildGoose
White Van Man



Joined: 21 Mar 2002
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PostPosted: 19:54 - 12 May 2006    Post subject: Honda H100 SJ Questions Reply with quote

its a Honda H100 SJ from 91 i believe

started poking the h100 tonight, in an effort to give it a bit of a going over, i've owned it for about a year and havent done much in the way of maintenance

its definately one of those situations of not knowing where to start or how much to bother spending

becoming, as ever, frustrated with the haynes manual, because it covers the whole range of h100 models, but tends to generalise between them all, neglecting to pick out specific model differences within the maintenance procedures

my basic issues are

Arrow electrical gremlins - im starting with the battery, giving it a full charge, and if it doesnt hold charge, then ive got a spare standing by, the bike electrics werent working properly when i rode it from my parents to my new place, the battery was dead, the headlight was working when the bike was running at decent revs, but the tail light and indicators were not

if it turns out to not be the battery causing this issues, where do i look next reg/rec?

Arrow air filter, ive bought a new element to cut to size, it says i need to put it in 80/90 gear oil, i've not a clue what gear oil is? where to get hold of it? or how im supposed to apply it to the filter? any advice?

Arrow i know there isnt a conventional oil filter, but i was wondering if any owners know where the any filters are that might need a clean out, i believe there is one just after the 2 stroke tank, but i was wondering if there was a filter for the gearbox oil also? if so where is it located

Arrow leaking fork seals, anyone changed the fork seals on a small capacity bike with what i imagine to be fairly simple forks, is it a job for the amateur home mechanic?

Arrow this screw

https://www.bikechatforums.com/files/airboxscrew.jpg

its rusted nicely to its nut, the nut is made captive by a nut shaped recess of plastic in on the other side of the airbox, im sure your familiar with the kind of thing, however when you try and undo the nut just forces its way round in the plastic recess, and there is no way to hold it in place, ive tried squeezing the airbox at this point with a pliers, but the nut still just spins with the screw

Arrow here is a photo of the main electrical black boxes on the bike, and i was wondering if people would be able to identify what the particular ones are, there are four in this pic

https://www.bikechatforums.com/files/electriccomponents.jpg

Arrow i left a tube off when i last took the bike apart, and now a year on i cant remember which tube goes where, basically i was hoping an owner would be able to tell me which tube is supposed to be connected to the port in the picture its just above the what is either the throttle stop screw or the pilot mix adjustment screw (not sure which is which yet)... as viewed from the right side of the bike

https://www.bikechatforums.com/files/carb_116.jpg

any feedback appreciated as always folks!
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Kickstart
The Oracle



Joined: 04 Feb 2002
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PostPosted: 20:54 - 12 May 2006    Post subject: Re: Honda H100 SJ Questions Reply with quote

WildGoose wrote:
Arrow electrical gremlins - im starting with the battery


The H100 charging system is fairly pathetic (6V, tiny battery, etc). New battery might well help, and an old dead battery can easily cause bulbs to blow.

Think the headlight runs from a lighting circuit directly without the battery, while the other lights probably come off the battery.

if it turns out to not be the battery causing this issues, where do i look next reg/rec?

WildGoose wrote:
Arrow air filter, ive bought a new element to cut to size, it says i need to put it in 80/90 gear oil, i've not a clue what gear oil is? where to get hold of it? or how im supposed to apply it to the filter? any advice?


Gear oil, as in oil used in gearboxes (most cars). Halfords sell it. It is just there to catch the grit that tries to go through the airbox. Take the foam, wash it thoroughly and then put some oil on it. I tend to just use a thin smear. Squeeze the filter to get the oil to soak through.

WildGoose wrote:
Arrow i know there isnt a conventional oil filter, but i was wondering if any owners know where the any filters are that might need a clean out


Not sure there are any filters as standard. Certainly not in the engine. Might be an aftermarket fuel filter.

WildGoose wrote:
Arrow leaking fork seals, anyone changed the fork seals on a small capacity bike with what i imagine to be fairly simple forks, is it a job for the amateur home mechanic?


Difficult to know, but probably quite easy. Crack off bolt at bottom, take off top of fork, undo bottom bolt fully. Take off fork dust seal, remove circlip above fork oil seal. Normally then yank the forks apart (the fork bush pulls the oil seal out, hence you need to yank them apart fairly hard). Clean up, new seal, reassemble and put in correct amount of oil.

WildGoose wrote:
Arrow this screw


If the nut can easily be got at to replace it then use a dremel to chop the head off that bolt. Watch out for the bolt getting hot and melting the plastic. Then just use a new nut and bolt

Sorry, cannot remember which box is which (sold my H100 over 17 years ago).

All the best

Keith
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stinkwheel
Bovine Proctologist



Joined: 12 Jul 2004
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PostPosted: 21:44 - 12 May 2006    Post subject: Re: Honda H100 SJ Questions Reply with quote

WildGoose wrote:

Arrow electrical gremlins - im starting with the battery, giving it a full charge, and if it doesnt hold charge, then ive got a spare standing by, the bike electrics werent working properly when i rode it from my parents to my new place, the battery was dead, the headlight was working when the bike was running at decent revs, but the tail light and indicators were not

if it turns out to not be the battery causing this issues, where do i look next reg/rec?


Yes, direct lighting for the head and tail light. Battery power for the flashers, brake light and neutral light. Check the battery and check the main fuse. Then check the voltage across the battery terminals with the engine running.

Also check the earths for the flashers and brake light.

Quote:
Arrow air filter, ive bought a new element to cut to size, it says i need to put it in 80/90 gear oil, i've not a clue what gear oil is? where to get hold of it? or how im supposed to apply it to the filter? any advice?


In real life, any old oil will work. For a foam element try this: Wash the foam in soapy water and rinse it out. While it is still damp, pour an eggcup full of oil onto the foam, scrunch it up between your hands then wring it out. you will see a cloudy emulsion of oil and water drip out of the foam. Now set it aside to dry.

This evenly coats all the foam in a very light covering of oil, which is ideal.

Quote:
Arrow i know there isnt a conventional oil filter, but i was wondering if any owners know where the any filters are that might need a clean out, i believe there is one just after the 2 stroke tank, but i was wondering if there was a filter for the gearbox oil also? if so where is it located


None that I know of for the oil. It just sits in a sump, doesn't get pumped through anything to filter it.

There will be a fuel filter. If the tap has a sediment bowl, unscrew it and you will find a circular gauze filter sitting in the bit above the sediment bowl. Take this out and wash it in clean petrol.

If there is no sediment bowl, the filter is inside the tank. Lean the tank over to the right so the fuel sloshes away from the tap. Undo and remove the tap and you will see a gauze filter shaped like a 'sock' over the top of the fuel inlet spout. Wash this in clean petrol.

Quote:
Arrow leaking fork seals, anyone changed the fork seals on a small capacity bike with what i imagine to be fairly simple forks, is it a job for the amateur home mechanic?


Never done it myself. My mate managed to do the ones on his GPZ and he is far from an experienced mechanic so I can't see you having too big a problem. It is also one of those jobs that you could easily take the whole lot to a mechanic if you get stuck, you will save on labour if you have removed the forks from the bike yourself anyway.

Quote:
Arrow this screw



Drill the head off the screw, push it through, throw it away and fit a new one.

Quote:
Arrow here is a photo of the main electrical black boxes on the bike, and i was wondering if people would be able to identify what the particular ones are, there are four in this pic


See below. I think the other one is the CDI but I'm not entirely certain. If it is connected to the ignition coil, then it is.

Quote:
Arrow i left a tube off when i last took the bike apart, and now a year on i cant remember which tube goes where, basically i was hoping an owner would be able to tell me which tube is supposed to be connected to the port in the picture its just above the what is either the throttle stop screw or the pilot mix adjustment screw (not sure which is which yet)... as viewed from the right side of the bike


Pretty sure that is just an overflow pipe to dump fuel and kill the engine if the bike lands on its side. As such it has nothing attached.
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“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.
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WildGoose
White Van Man



Joined: 21 Mar 2002
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PostPosted: 21:52 - 12 May 2006    Post subject: Reply with quote

thanks chaps, thats just the ticket Thumbs Up

what state is your H100 in these days mr stinkwheel? you still got/use it?
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WavyGravy
Scooby Slapper



Joined: 10 Mar 2006
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PostPosted: 22:03 - 12 May 2006    Post subject: Reply with quote

heres the throttle stop and pilot airscrews

Gear oil is horrible stuff, smells, I use normal engine oil in my small honda filters, but you might find gear oil specified for your forks as it is on mine.
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stinkwheel
Bovine Proctologist



Joined: 12 Jul 2004
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PostPosted: 22:08 - 12 May 2006    Post subject: Reply with quote

WildGoose wrote:
thanks chaps, thats just the ticket Thumbs Up

what state is your H100 in these days mr stinkwheel? you still got/use it?


I was actually going to have a go at it this weekend since I'm on-call. Got a couple of new tyres to fit and an exhaust gasket to make and fit (since the local honda dealers were singularly unhelpful when it came to supplying one). Then it's ready for the MOT. A few mates have H100s and C90s. Going to try and organise a run to the lake district later in the year and do all the wacky fell passes on them (and scream up and down Heartside pass on them to annoy the police).
____________________
“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.
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WildGoose
White Van Man



Joined: 21 Mar 2002
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PostPosted: 22:13 - 12 May 2006    Post subject: Reply with quote

definately do something to your soul these little bikes

can go as fast as you like on something like a busa, or lean as far over as you dare on an nc30 or something

but dont think i'd part with the little honda now Smile
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stinkwheel
Bovine Proctologist



Joined: 12 Jul 2004
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PostPosted: 13:47 - 14 May 2006    Post subject: Reply with quote

stinkwheel wrote:
Pretty sure that is just an overflow pipe to dump fuel and kill the engine if the bike lands on its side. As such it has nothing attached.


I was wrong. There is a hose on there, it loops round the back of the carb and down towards the road just in front of the swingarm pivot on the left side of the bike.

It would only do anything if you dropped the bike, presumably it directs the fuel that is running out away from the exhaust.

Just been checking mine out, needs a new header pipe, pishing smoke out from all round the flange.[/quote]
____________________
“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.
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WildGoose
White Van Man



Joined: 21 Mar 2002
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PostPosted: 17:05 - 14 May 2006    Post subject: Reply with quote

Quote:
I was wrong. There is a hose on there, it loops round the back of the carb and down towards the road just in front of the swingarm pivot on the left side of the bike.


cheers! it seems when i put the bike back together from the engine out job last year, that i neglected to connected anything in the carb area on the right hand side of the bike, in fact the only time i remember being round the right hand side of the bike was to re-connect the tacho drive, and possibly the footpeg mounts
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WildGoose
White Van Man



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PostPosted: 17:06 - 14 May 2006    Post subject: Reply with quote

out of interest, you got any rust issues on your bike anywhere?
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stinkwheel
Bovine Proctologist



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PostPosted: 21:14 - 14 May 2006    Post subject: Reply with quote

Top of the exhaust header.

Inside the chrome mudguards, this happens on all small hondas with chrome mudguards, they rot through. If you get a new one (pattern ones aren't expensive) give it a good thick coat of paint on the inside surface.

Some rust on the wheel rims.
____________________
“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.
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judderman3000
Nova Slayer



Joined: 31 Dec 2005
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PostPosted: 22:50 - 14 May 2006    Post subject: Reply with quote

a bit off topic but i did one of these up that had been stood, made a tidy 300quid profit but it was a bit of a ballache, the electrics break for FUN!
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