Re: Project: Garage Find
 

Hopefully not an air leak, but will try some WD40 and see what happens.

The throttle cables have been adjusted as per the manual and they move nicely. Both needles/ slides move at the same rate. And both needles are set to the same height. There is also no mixture screws to play with. As for the cans, speaking with the chap who made them having the needles at the original height is the place to start and then adjust after that.

Will have to take the plugs out and look, good point.

I've also been suggested the pilot jets. One of the few things I didn't take out. Might see what they look like as its been suggested they might be clogged even after the clean and a cause of issues like this.

Re: Project: Garage Find
 

Might be worth firing it up and leaving it ticking over for a while, do this a few times and it may help. It worked for my 2-stroke strimmer that hadn't been run properly for a few years when I bought it. It ran exactly like you describe but cleared itself up eventually.

Re: Project: Garage Find
 

That's the thing though I cant leave it ticking over. It will run for about 20 seconds before stalling. That's with the choke still on and no input on the throttle. But I was hoping it just needed a few starts before it settled in like you say.

Project: Garage Find
 

That it will only run with the choke on obviously suggests a fuel flow problem, if it runs on both cylinders then the initial problem of the overflowing carb would appear to be a stuck float or needle that has at least partly cleared, even so the carbs need to come off and the first thing to look at is the pilot circuits, but it would be wise to check the floats and needles for correct operation while you're there, were those parts replaced? If yes then checking the float heights would be a good move. As others have said, making sure there's no air leaks would also be sensible.

Re: Project: Garage Find
 

Page 23 of this thread, you've some bits left over. This is the idle mixture adjustment screw.

On the carbs there are will be a blanking cover for this screw on each carb, you'll need to prise/drill out to adjust. I'd suggest this is where to start.

That'll get your low speed/idle mix right, once you've had a fiddle. High speed will just be needle position.

Got any more pics of the carbs? both sides, and underneath? easier to help then.

Re: Project: Garage Find
 

I've been in the garage and have stripped the carbs down again and think I have a good idea as to what is wrong, but first to answer a couple of points. There is no mixture screws however there is an idle adjustment screw. In the earlier pictures I compared the old and new design of screw and am using the new one. Also in earlier pictures the needle set had a couple of additional parts, I have a feeling these are due to the kit being used in later models where things have changed, but there is backward compatibility.

However what I think is the issue was what was suggested by epa police (not of this parish) and Sid Squid. The pilot jet.

It would appear that I made a slight oversight and mistook the pilot air jet for the pilot jet. The air jet I removed after cleaning and reused as it looked fine. I missed the pilot jet which is hidden under some plastic pipe behind the main jet. And having inspected one jet forgot that there was another.

So tonight I removed the pipe to take a look at the pilot jet and it is covered in the varnish from the old fuel. It looks like the pipe prevented the pilot jet from being cleaned. I don't have a picture of this due to the size and position of it but both were well clogged. Additionally I can't remove the jet as it is very stiff and I don't want to risk damaging it and preventing its extraction.

The plan now is to get the carbs ultrasonically cleaned again without the pipe. Remove the pilot jet and stick a new one in. Might be a few more days before I fire it up again, but that gives me some time to sort a couple of little bits out. Watch this space.

Re: Project: Garage Find
 

Excellent. As suspected it would be running lean due to that. Hopefully when it's clean it'll be a lot more perky.

I have to say, what an amazing job you've done with this. Doing something similar to the VFs i have at some point, but probably not to the same degree or level. Mad skills, and patience, sir!

Re: Project: Garage Find
 

Before I do the main update, cast our minds back to the original carb rebuild and the extra washers in the needle kit. Well its been suggested by James P (not of this parish) that they are used to fine tune the needle height between notches. Best suggestion so far and makes the most sense.

Re: Project: Garage Find
 

Took the carbs back to Rolling Art to be ultrasonically cleaned. Glenn apologised for missing it the first time, but its no bother as I had missed it too. Anyway pilot jets removed and the carb recleaned I pick them back up.

http://i153.photobucket.com/albums/s...ps6d2eff08.jpg

Decided that new pilots would be best considering the state of the originals as can be seen above, new on the bottom, old on the top.

So blasted them out with air. Rebuilt them and stuck them on the bike.

Slight problem. Cant start it now.

At most got a couple of tiny puffs and that's been it. Choke on, off, open throttle, closed throttle. Nothing.

Swapped plugs. Checked their spark. Nothing. There is fuel in the float chambers.

Ideas please?

Re: Project: Garage Find
 

It's a two stroke so it shouldn't be difficult (famous last words!!):???:

So assume you have checked sparks, (at the right time i.e. not 180' out?), have you checked the earth on the coils - it may be sparking but does it under compression - if the spark is weak might be an earth issue.

Slightly wacky thought - is the mix correct - try disconnecting the oil pump / injection and try and start it on a pre mix oil/ petrol direct into the tank.

Good luck I'm sure you will get it sorted...