Sachs sx1 engine trouble. By fj12rider (Read 1,978 times)

[fj12rider]

Ok , first I'll give you some background, I bought this as spars or repair. It had a 70c barrel and piston which I took out and put it back to 50cc , got it running and finally got round to insuring my daughter and getting her on the road . It's a 2008 btw. 

Ok here's the issue. It ticked over sweet as a nut but as soon and you moved the throttle it died . There was a loose breather hose laying on top of the engine and I noticed that the place it should have been had snapped off . Repaired that and now it will at least accelerate . Now , the bloody this smokes like a train, and I mean bad ,  I've fitted a new oil pump as the old one was faulty (the cable holder had snapped off) , and , it's absolutely gutless . I'm not expecting it to break the speed record but it'll make 30 (mph) down hill and you are lucky to hit 15 up hill , 20 on the flat . There has to be something wrong here somewhere , it's a long time since I've worked on 2 stokers . Is this restricted ? Can it be de restricted to make it rideable , it's not rideable at all at the min what with the smoke and the lack of power . It's got a weird valve thing connected to the exhaust that goes to a breather pipe that's connect to a vac system , what's that ? 

Any nay help would be very gratefully received .


cheers
dave

[jvino]

Yeah scooters are pretty much slow on the hills that is normal I believe as far as I know I have a 125 vino and on extremely steep hills mine will only go 10 to 15 miles an hour. But on longer gradual hills will do 20 to 25. Small scooters don't typically do the speed limit though. They are much better on flat land and side roads.

Good luck and hope your daughter enjoys here scooter and is safe.

[Alleyoop]

That is an EGR system I put together a thread aout the emission a scooter may have:

scooterdoc.proboards.com/thread/9153

If it is smoking to much then to much oil is being fed. The throttle cable should be a Y and when you twist the throttle cable it also pulls on the cable oil cable. It should have a adjustment on the oil cable so give it a little more slack so it does lessens the oil flow.

Also have you adjusted the carb, Here is how to adjust the carb:
Alleyoop

scooterdoc.proboards.com/thread/7678/2ts-carb-tuning

[fj12rider]

Cheers ally I'll have a read , cheers 

[fj12rider]

I've just checked all the cables and all of the adjusters are as closed as they can be.

[rob63]

If it hasn`t had the derestrictions removed then it would only top about 30mph on the flat and about 23mph up a decent gradient.
The most common restrictions are a nylon washer about 4mm thick between the variator halves. You`d need to remove the belt cover then undo the nut holding the outer variator wheel on. The washer should be visible sat on the variator collar. Remove it and put things back together.
The other restriction is normally a branch pipe part way down the exhaust downpipe (about 6 inches from where the exhaust joins the cylinder). This normally leads to a weird emissions system which has a hose going to atmosphere. Cut the pipe about an inch from the downpipe and crimp it on the downpipe side( a line of weld also helps seal it) and get rid of anything which you cut off.
One other thing could be a pink wire on the cdi, this can normally be disconnected from a bullet connector.
The smoke is worrying and as Alley said would be due to excessive oil. It could be old oil sat in the crankcase or even in the exhaust. Once you`ve set the carb up and cleaned the air filter, take it for a spin to see if it clears. Don`t let it idle as it won`t help at all.

[Alleyoop]

The to much smoking could also be for lack of fuel not the right mixture so after adjusting the carb to have it feed more fuel some of the smoke will go down.
Alleyoop

[fj12rider]

Thanks guys , lots to think about there. Rob , the weird emissions thing , can I just remove the valve box that's at the end of that little pipe half way down the down pipe and put a plate in in place of it to seal it off ?? That was giving me loads of grief , that valve goes off to a box thing with a vac tube on it , which in turn has a wider breather pipe connected to it , if that pipe isn't connected to the air box the bike will bog as soon as you try and give it any throttle what so ever . I'll try and derestrict it tomorrow .

[Alleyoop]

Yes if you take the hose off the air box you need to plug up the connector at the air box otherwise it is getting to much air to fuel ratio.

You can take the valve off the pipe and plug up the hole and also make sure you plug up the VACUUM hose at ITS Source. And dump everything else.
Alleyoop

[fj12rider]

Cheers alley , the vac is on a t with the peacock so that's easy enough, I'll try removing it all again today , yesterday when I tried it just bogged , but I didn't block the air box , bloody Chinese bikes , she's got a Suzuki ap50 scooter and that goes like a rocket , the only issue with it is the rust on it and the plastics are fubard . But it is a 1995 . That does 43 mph uphill standard .

[fj12rider]

OK here`s where i`m at ,

Opened variator casing , no washer .
tried to remove the cat , bogged like mad
checked cdi , no pink wire .
carb was already setup .
Still runs like a bag of poo .

I`m thinking that it`s probably just how the bike is , rubbish , it`s still smoking like a mad thing , the more you ride it the worse the smoke gets . I`m going to check the petrol later incase the previous own had put premix in it due to the faulty oil pump but I dont think so. I`m definitely not impressed with it though . I`m going to try and get a de-restricted cdi .