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CB750 / K7 carb help.
« 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.
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.