TrxPipUK

Okay so that controls air and fuel mix? Am I right in thinking the more you screw it in the less fuel the engine gets? What about the screw on the side? I think it's near the idle adjustment.

Hmm okay... are there separate air and fuel screws? Or is it controlled by the screw on the bottom of the carb? Still haven't got my head around what screws do what lol.. I know what the idle does though haha

Okay great thanks. I'll check for a vacuum leak. Is there any chance the piston in the carb is sticking or something?

Hi all. Wondering if anyone can help me with an issue I'm having? Basically I think the carb is either sticking or there's a fuel issue. It idles okay but then when you rev it up and let off it stays quite high for a few seconds before dropping down to idle speed again. Also it revs up by itself sometimes after giving it some throttle. I'm pretty puzzled about what's happening with it so help would be amazing. Thanks https://youtu.be/OB5gOOD5WjY

Thanks again retro for setting us all straight lol

No apology needed Goober!

I don't have the sticker on the frame unfortunately as the frame was blasted and powder coated

This is the manual I am using

Hard to believe but it is true.. All I can tell you is that when I turn the engine over with the kicker the flywheel is turning counterclockwise! 100% sure of this, have seen it with my own eyes lol. Not going to take the side off sorry, don't quite have the time to experiment and I am now happy with the engine. It is peculiar as to why the manual is wrong.. but there we go. Thanks Goober

Thankyou everyone and thankyou @retro for stepping in and giving an explanation, much appreciated. Makes a lot of sense that the engine turns over counterclockwise as that is the way the kickstart turns it over (I have checked multiple times now lol). My biggest question is why does the manual say to turn it clockwise when that is definitely NOT the correct direction.. very confusing. Thanks again for clearing that up retro, I'll turn the engine over counterclockwise and check all is okay. Thankyou everyone

I think I'm just struggling to find TDC on the compression stroke.. At one of the TDC's the intake valves begin to shut but before they do the exhaust valves are beginning to open. It's like they're both just off their seats. This doesn't seem like the compression stroke as there is no resistance when turning the engine and there is no clearance between valve stems and the rocker. At the other TDC there is compression when the piston is coming up and once the valves seat then there is a lot more movement of the piston before any valves open again, there is also clearance between the valve stem and rocker. So this seemed to be the compression stroke to me apart from that the last valves to close were the exhaust and not the intake, maybe it would make more sense to turn the flywheel round anti clockwise and see if it's easier to find the compression stroke that way. Am I right to be turning it clockwise? When I used the kickstart the flywheel turned round in a anti clockwise direction. Surely it would be better to turn it over by hand that way as well even though the manual says turn it clockwise? I hope my little ramble there makes a bit of sense.. I don't know why I'm finding it so hard to get the piston and valves in the correct position lol

That is a good point! I'll check which direction it turns with the kicker. However, I am turning it clockwise as the manual says to. As long as it's not going to be damaging the engine in some way then I'm happy to just run it as is. Thanks

Yes I am confused about it as well... Reading that article and surely if it was 180 out then it wouldn't run? Will it be okay running like this or will I have to go back into the engine and and sort it out properly? I can't see how it would be like this though. I remember when setting the timing I thought it looked all backwards when turning it over, but I had the timing spot on so I went with it. Can I just run it like is?

Just looking at the valves to check the clearances again seeing as I had the carb off. And looking at it whilst turning the engine over by hand it seems as though the compression stroke is straight after the exhaust valves shut... this doesn't seem right? I've got the spark plug in as well so I know when the compression stroke definitely is. Does anyone have an explanation as to why it's like this? Would the valves be set right as long as it's on the compression stroke? Funny thing is that it runs so surely everything is fine? Lol I'll get a video

Thankyou both very much! I will report back when I do it, will probably be on the weekend

Thankyou Goober. Plenty information for me to be getting on with. I'll go over the carb and sort it out. Thanks

Okay great thanks! So I'll charge the battery up as soon as possible and I'll have a play with the idle speed, see what sounds best. When you say a vacuum leak, where might that be? In the engine? And lastly, what is the throttle slide diaphragm? I haven't come across it before. Thankyouuu 🙂

Yes has a muffler on it, I welded up all the little holes I could find in it as well then painted it. Yea could well be carburetor synchronisation as I don't know what that is haha... I'll have a look over the manual. Is that adjusted by one of the screws on the outside of the carb? I'm aware that there is an air/fuel mix screw somewhere as well. Is that worth looking at as well? Thanks Goober

I fixed the problem of not drawing fuel from the tank with a couple fresh o-rings in the petcock. Now I have had it started up (have to kick it because the battery is flat) I've noticed at idle the engine seems a little inconsistent? Not sure if it's normal or the carb needs tuning or what? Hopefully it's noticable in the video. Any help would be greatly appreciated once again. Thanks

Thank you man! Appreciate all the help you have given

Thanks Goober! Have fixed the issue now. It was the petcock not sealing against the tank properly, replaced the o-rings and now it draws fuel fine 🙂

Thanks guys! Yes I will keep you up to date and I'm sure there will be more questions lol.. Pics will follow as well as it comes together 🙂 Thanks, all the best

Earlier today I had a very exciting afternoon! After some fiddling and finding fuel wasn't being drawn from the tank, I put the fuel line to the pump straight into a can of petrol and she fired right up!! I think the carb needs a little tuning as it needed to run with the choke half on. Apart from that though, the engine sounded great! No tapping or slapping noises or anything, I'll get a video of it running when I start her up again (need to charge the battery as I flattened it lol). But most importantly I wanted to say a HUGE thankyou to every single one of you on hear that has helped me and guided me along. I can't name you all but you know who you are! @shadetreethankyou ever so much for getting me the parts that I needed to get this old quad running. I can't thank everyone enough! Cheers guys 🙂

So just looking at the valves and the intake is a bit loose at just over 0.13mm, however the exhaust has no clearance at all and is too tight. The manual says the clearance for both intake and exhaust should be 0.08mm, so I'll set both to that.

Okay brilliant, thanks! So then at TDC use the feeler gauge between the top of the valve stem and tappet and adjust as necessary. Right? Thanks once again for the help!