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Discussion Starter #1
I’ve been trawling these pages for a while now and found so much helpful information, but now I’m after a bit of advice please if anyone can help? I bought a 1984 VT700 that I’m trying to get back on the road. I didnt have any experience of any of the workings or anything at all before hand, but had been told she needed a new reg/rec and battery and fork seals and thought ‘I can get that done’ - what a prat. Now it turns out, that it’s something not quite so straightforward and Ive been trying to track down the fault myself with the help of this forum and the manual and, of course, You Tube.

After going over the wiring for literally months and trying to work stuff out I’ve noticed when checking out the multitude of Earth connections under the seat, that one of these wires changes to a blue wire and goes up to the coils. It looks to me as though the Fuel Cut Relay has been removed and the wires re-routed. Now the black wire from the reg/rec that should have gone to the relay, goes straight to the fuel pump (I understand this bit), but the blue wire that should have gone to that relay, as been attached to the earth wires that go to the frame. This same blue wire goes to the spark units and coils. I just read that the ignition module connects and disconnects the ground to the coil, so does anyone think the earthing of the wire that was supposed to visit the fuel cut relay could be the source of my headaches? In my mind, it messes it up, but there’s so much about the way all this works that I’m still trying to figure out. I’m a secretary (or was anyway), not a mechanic or electrician. Gotta admit I’m loving it though.

Sorry about the lengthy blurb, she’s a VT700, but someone popped a 750 engine in the frame, installed a manual fan switch in place of the thermo switch and completely changed the petcock orientation to put a different filter in. I had the stator rewound as it was burnt out, bought a (used) reg/rec (just incase), new battery and Ive ordered a new clutch diode (“rectifier”) all the coils and pulsor readings check out. Still cant help but think there’s something obvious that I’ve completely missed.

Any advice very, very gratefully received.
 

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Welcome to the forum.

Yes the blue wire was to trigger the fuel pump relay so when the engine stops, in case of accident ,it turns off the fuel pump for safety. If the relay has been bypassed with a solid connection to the pump just unhook that blue wire from ground. It goes to the coil primary and if grounded will stop that one coil from firing.So if you have no spark to one cylinder that is a place to start. Good to hear you are studying the manual. Here is where the good folks here have provided a good Honda manual if you don't have one already.



https://www.hondashadow.net/forum/72-technical-discussion/122857-honda-service-manuals.html
 

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Discussion Starter #3
That’s fab, thank you. I didnt trust my own opinion on it, as so much has obviously been done to the bike by someone who ‘appears’ to know what they’re doing. The clutch switch has also been bypassed and that may well be another one of my query points further down the line! At the moment I dream about the wiring diagram, it’s taken over my life (in the best way of course!)

Thanks so much for your reply.
 

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Discussion Starter #5
That’s great news, as there appears to have been plenty of modifications to the trike over the years. Her history is hazy to say the least and I’m still trying to get my head round the wiring diagram, only to find I have parts missing and re-routed and bypassed which makes my head hurt!
 

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If you read the earlier discussions you may have seen the idea of taking out the 2nd spark unit as it is called. It is really a 3rd control box the 1984s and if removed it has solved some no spark issues.
 

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Discussion Starter #7
I have two separate spark units (both under the back seat), but on the wiring diagram, they are referred to as “Spark Unit 1”, spark unit 2 on the plan is not there at all. I’ve read it’s somewhere down by the starter motor, but there’s nothing down there, so I was assuming I had already had this part removed? Still leaves me with 2 units, but both are called ‘unit 1’ does that sound right?

Thank you so much for the help.
 

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Discussion Starter #8
She’s alive!!

So I cut the blue coil wire that went to earth, rewrapped all the necessary and put everything back together.

My dad and I then tested the four spark plugs (which were a real pig to get out), but when finally they came out and were tested, all four plugs had a spark.

After putting everything back together and charging the battery fully for good measure, this morning I tried to start up and after much spluttering and choking and clanking (all of which was a bit worrying), she finally started (pretty stinky!)

I took her down the road and back a couple of times and was amazed (and a little frightened) at the speed I could get up. As there’s no MOT or anything, I couldnt take it any further and also I was a little worried about the pull on the throttle when I stopped, felt kinda like it was gonna go without me, but this may have been just because the choke was still a little out.

I thought it might be time to ask a mobile mechanic round to look her over for me before I take her for her MOT as I’m not sure I have all my gears but to be honest, I wasnt sure this day would ever come.

Thank you for the sound advice guys.
 

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Discussion Starter #9
Update picture

Here is a quick update picture now that I have the tank and front seat back on. Still need some work to make the side panels fit, as I may need to adjust some pipe work to the fuel filter, but hey, it’s progress!
 

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Here is a quick update picture now that I have the tank and front seat back on. Still need some work to make the side panels fit, as I may need to adjust some pipe work to the fuel filter, but hey, it’s progress!
Gotta say, after reading through the thread I wasn't quite expecting something looking anywhere near that good!

You scored well, and indeed have a worthy project to bring fully back to life!

I've done a LOT of miles on my first VT700 and will do more once I get some engine work finished. Treat your one well (regular oil changes, reasonable quality oil and coolant etc) and she'll treat you really well.
 

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Discussion Starter #11
I was worried to be honest! I think she’s had a lot of work done to her over the years and I wasnt sure how much of the original is actually left. She already has nearly 37K on the clock but I’m hoping that she has plenty still left for me. Going to take a bit of getting used to though, the Dragstar trike that I had previously had an ‘easy-steer’ unit fitted to it, which gave it similar to power steering and I was really feeling the difference turning the Shadow today- she’s heavy!
 

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Smileyk;5480294She already has nearly 37K on the clock but I’m hoping that she has plenty still left for me. Going to take a bit of getting used to though said:
I got near 100,000 miles out of my '86 700 (I was her 12th owner) before a leaking head gasket and a long hill caused a significant failure in the gasket. Will cost another $200 or so to get the bores re-honed and new piston rings (NOTE that the 700 uses a bore diameter that is common with cars, so a decent engine reconditioner can replace the rings with a slight modification to the piston (car rings are thicker or deeper, can't recall which). 75,000 of those miles were mine, and were done year round in everything from son to snow to gale. I had few issues with her, the odd bearing and so on to be fixed but for the most part she was just a simple reliable ride.

I would expect, so long as your engine hasn't been abused to much, that you'd see 100,000. I've known people to see 300,000 miles without major work. Keep your fluids good, don't stress her (but don't baby her either, she'll hate you for that!) and keep her reasonably clean (don't let rust sneak up on you) and you'll have her a good few years yet!
 

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Discussion Starter #13
Thanks for that, I’ll try my best to keep on top of it all. Still trying to work out what’s what really. There’s been quite a lot changed (like the 750 engine and manual fan switch), and the main framework has been painted over and the tank is not the original - I got another, a red tank when I bought it, so I think that was the original colour (it’s a little battered). Hoping for some fun times ahead!
 

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Take some more pictures. I would like to see the drive train and how all that works.
 

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Discussion Starter #16
Popped out earlier and took these pics for you...

I think my problem with the feeling of the throttle is because I changed the slot that the cable was secured into under the tank (on the left hand side). I thought that I’d stretched the cable when I put the new RUN switch in and it seemed too slack, so I put it into the tighter of the two options under the tank. I think this is why the bike felt like it was pulling all the time. I think I’ll try and loosen that off tomorrow and then I’ll have another excuse to pop down the road for a ride. I’ve also now ordered some new lights to go on the side bars in front of the rear wheels and also some rubber gromit type things to act as ‘stop ends’ so that I can remove the arm rests and that big old back rest - it’s not really my thing- exciting times!!
 

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Discussion Starter #17
By the way, check out the hand brake - I can’t help but laugh every time I use it, I takes about 10 turns before it engages completely - its hilarious, I’m not intending to change it though, I love it!
 

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Popped out earlier and took these pics for you...
Tbanks! I've seen some terrible trikes in my time, this one is NOT on that list! Even the flames work on it :)

I think I’ll try and loosen that off tomorrow and then I’ll have another excuse to pop down the road for a ride.
Ermm... You need an excuse? :)

I’ve also now ordered some new lights to go on the side bars in front of the rear wheels
These can be life-changers, and life-savers. I have a couple of extra's on my bike (have had for almost as long as I've been riding Shadows) and I always noticed that when I have them on I get far less people pulling out in front of me. I think it's a two-fold effect, the unusualness of it makes people look longer and also the triangular shape helps define size and makes it much easier for them to calculate my speed. And it makes the bike look a bit bigger so a bit more a of a threat :) (No decent pics, may rectify that tonight :) )

Be sure to read the threads on wiring extras to your bike. Separate fused power supply from the battery, via a relay, the relay controlled by existing lights or ignition. Just yesterday I blew my main fuse because I mis-wired the heated grips (wired them the logical way, I've never fitted them before so learned that my logic and the maker's logic differ :) ). If they'd had their own fused supply, I'd only have knocked them out. The relay is important to not stress your switch contacts :)

And have fun. You have a lot of room on the trike to 'play'. Of course, take note of the generator's output (probably a whopping 350W at 500,000,000RPM! :) ) and how much mass the engine can comfortably move. LED lights give you so much more to play with!

As to the hand-brake - I bet after a while you'll feel somewhat cranky when using it, especially when you're in a hurry for a bathroom/coffee break or to get away to beat the rain :)
 

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Discussion Starter #19
You could be right about the hand brake, I’ll have to see how I go - I think it may be a big of a nightmare to change as it’s part of the big flat back footrest bit, which in turn is part of the frame, but there seems to be many things that aren’t the way they appeared at first glance.

Thanks for the advice regarding the sidelights. I’ll take your advice on it and look into it a little further. I was intending to cut and use the feed and earth which has been run to another light on the top of the large back rest (which I am hoping to remove), but I think now I might do as you suggest and put in a relay and a fuse, especially as they are only cheap parts coming all the way from China (no harm in putting in a little extra protection).

Unfortunately as I still have no MOT, my insurance is not valid on the road yet, so the only ‘outings’ I get on the trike are little ‘test runs’ up and down our side street, hoping to rectify this situation in the not so distant future though, especially as the summer is quickly slipping away.

Looking forward to seeing your pics, sounds awesome, what sort of bike is yours?

As always, advice taken very gratefully - I’m new to all this business and there’s so much to learn! Many thanks
 

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Thanks for the pictures, that is too cool.

I wonder where the diff came from?

The angle on the driveshaft is a bit much, but if it doesn't vibrate that is great.
Parking brake crank wheel, Who da thunk it .
Have fun with that cool ride !
 
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