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Messages - zippy!
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« on: September 09, 2017, 10:23:49 PM »
So I'm back up and running. Leaks all fixed.
The problem was.... a crappy rotor arm that had spun itself out of position inside the dizzy. Nightmare!
Anyway I'm back on with setting the carbs up now. Bit of oily type residue on 3 plugs but good on the others. Think this may be down to no valve stem seals as opposed to a carb problem.
Need to get hold of a balancer, but all in all she's going well.
Thanks again for all of the kind help and advice.
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« on: April 29, 2017, 08:38:18 PM »
And of course what the Honda technology pushes along...
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« on: April 29, 2017, 08:29:22 PM »
A couple of pics (sorry I know its not a bike!
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« on: April 29, 2017, 02:19:56 PM »
Absolutely invaluable information. All makes more sense now.
The engine was originally 875cc, but I have used a larger Talbot sunbeam 930cc unit for the slightly bigger capacity and stronger block. The next steps are boring out to 998 or 1040 so the 930 is a happy (ish) medium from standard 875.
I will try to add a photo of the set up. At first, the intake side of the carbs was so close to the offside chassis rail that I could only get some mesh (cut up sieve) jubilee clipped over each carb inlet. After reading some forum advice regarding the extra air flow, I lifted the needles on position on the clips.
Over winter I had the manifold modified some more to allow room for better filters. All I could fibd was some cheapo k and n style copy things on eBay. They do the job but one jubilee clip has already breached its rubber connector. I also put in different main jets. Will have to check out the size.
I will look at the 900 carbs as an option. So thanks again for that advice.
The main issue is my air leaks. I have just dropped the manifold off with the welder, he's hopefully sorting it Monday, then I can get the face of the flange skinned. It is warped by about 1mm at either end.
I must admit, as much as these things annoy I us and cause you to tear your hair out, it keeps things interesting!
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« on: April 28, 2017, 06:56:05 PM »
I'm on with it now. I will get there!
Gonna try getting something down the small ports (2 little pipes) on the air intake suddenly of each carb (not sure what they do mind).
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« on: April 27, 2017, 05:38:47 PM »
Brilliant info, thanks again, it really is appreciated.
Just an update, got the carbs off last night, and took the float bowls off. Attached some tube to the mains one at a time, and blew up, each appears ok.
Do the same with each of the smaller (pilots/idle?) and they are all clear.
Blew through the fuel feed, and floats are all working ok. Wonder if I have unblocked something in the process.
What I did find was a couple of pin holes in the inlet manifold, and that at the inlet on no1, there was light showing through the gasket when I shine it through, maybe a bit warped. This will not help at all. I will address the manifold next, then pop it all back together and check the timing. Not sure if / how that would have gone out but worth a check.
Thanks again, Gav.
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« on: April 25, 2017, 09:37:22 PM »
That's great news. Sorry to ask further, but is any particular year better than another? I.e. For setting up or reliability etc.
Trust me to have picked up the worst ones. I knew I was in for trouble when I found out they only used them for one year!
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« on: April 25, 2017, 09:24:56 PM »
I bet the bond was fun!
Thanks for the reply.
I've got an alloy foam filled fuel tank so that should be well baffled. I try to keep it full too. All new fuel lines (though rubber), running with a facet electric fuel pump with small inline filter, then in to a larger filter king fuel pressure regulator and filter. Pressure should be ok as when it was too much, I got fuel from the drains.
Will take them off and check all of the passages are clear. Do you know if any other 750 carbs will fit straight in to the inlet manifold (size and spacing)? The carbs are held on by silicone hoses so a few mm either way will be ok!
Cheers
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« on: April 25, 2017, 08:10:20 PM »
Hi all, firstly sorry to drop in and be a pain! I hope the moderators allow my post.
I have had help before with missing bits and thanks to you guys being a great community I was helped out massively.
I am running some CB750 K7 carbs on a Hillman Imp. Yes you read that right! I bought them off an imp trader and thought I would give them a go, and prevailed, despite many a time I could have given up.
The car has only done a few hundred miles since restoration and bar needing a proper tune, it was running fairly well, albeit a bit rich. Pain to start due to the chokes being removed but once on the go not too bad. At first the custom manifold we made didn't allow room for air filters, so mesh it was for a while. I dropped the clips to make up for this.
Over winter while off the road, the manifold was modified to accommodate room for filters. Started up and ran about as well as before.
One thing I did have an issue with is the odd bork when cornering harder to the left. The carbs are mounted on the car in line from rear to front with air intake to offside (cyl 1 is at the back of the car). This happened the other day to the point where she cut out. I think I may have flooded trying to re-start, and being towed an hour or so later, tried to bump it and got only a couple of big misfires. (Could this have further hindered things).
Since then, I've checked I have spark, got fuel to the carbs and got compression. With the carbs off I can see the accelerator pump is working ok. Not sure how I can check the main jets. However when turning over, I don't think fuel is reaching the cylinders. The plugs aren't getting wet, even when really turning over for a while.
I did briefly get it to make a little "hissy cough" when turning over a few times when giving a brief pump of the throttle prior to turning over.
I'm not any sort of carb expert, but I was wondering if there is anything on the carbs I should be paying particular attention to. Plus does anyone ever have an issue with borking out? Though my case was left hand bends, on a bike it would be the equivalent of a hard stop!
In any case I hope this makes sense. Thanks in advance for any kind input / info that can be provided.
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