Romet 747 Eco 4T: Difficulty Starting Cold Engine After Long Standstill

Hello, I have a small problem starting my scooter. After a long standstill or when it is cold, e.g. in the morning, it starts burning very hard, but when it starts and warms up, it burns to touch. The spark is, the carburetor cleaned and adjusted, checked for left air, the suction checked on the table is working properly. Well, normally his hands fall with him in the morning, you have to dig 30 times before he gets it, he gets it working evenly. I had six bikes, took them apart and put them together, and this Chinese beat me and I can't handle it. I have no way to measure the compression in it, but it has traveled from 400km only, I doubt it was weak. Any suggestions for Romet? since the news there have been such problems with him firing up.

Buddy, you "checked the electric suction permanently", but whether it works in the scooter installation. With the electric scheme you can check the "path" of the suction power supply, maybe the cables are damaged somewhere. Check carefully that the carburettor is carefully and correctly fitted. In addition, if the scooter has a fuel filter, before starting, for example, pay attention to whether there is fuel in it, because if not, look for the cause of the leak, the carburetor valve may be damaged.

One is electric suction may not start and two are valve clearances to check.

As I wrote, checked on the table, but one morning before the start I twisted it for diagnosis, and a needle with a piston inserted in the suction or suction started. As for the careful installation of the carburettor after cleaning, I did not make a mistake with the assembly, only one thing bothers me, the gasket that is mounted on the cylinder under the carburetor stub does not fit centrally into the cylinder bore, i.e. on one side a 3mm gasket clogs like a cylinder bore, while on the other hand, it's missing and you can see a piece of the cylinder. I don't know if I have understood it clearly, but the diameter of the cylinder inlet is slightly balanced anyway. The next thing is after about 10 presses on the kick the scooter did not start, so I unscrewed the candles and it was dry, you can not see any moisture with gasoline, the symptom as if there was no fuel in the chamber, it may go down somehow, normally the feet fall down.

I just thought about these valves, I need to measure my free time for peace of mind, there should be suction 005 and exhaust 007 yes?

yes, but if you give it after 0.05, it will also be good, with this gasket it looks like it is inverted, but even if it should, calmly smoke anyway.

After a long break, I wanted to return to the topic. I set the valves in my own way and adjusted the carburetor, candle, coffee with milk, or book. The scooter now smokes in the morning from the first spin with the starter, and it runs evenly, but now I have a different problem. If it comes on a little and turn it off, then from the hole on the carburetor aeration from the filter side, fuel is filtered into the filter, and if it ignites, the filtration stops. It drains for about 10 minutes, maybe 30ml of fuel spills out and stops, then it can stand for 5 days and the drop will not leak. I will add that if it stops for 10 minutes and then it runs, then there is a problem with running it. I stopped his egr, if it could be something related to the fact that the fuel is being filtered, I have the impression that some vacuum was created in the carburetor and sucked it out.

Adjusting the float plate to a higher point brought the expected effect.

First of all, there is no EGR there, so what you have blinded EGR certainly wasn't. This is a flue gas aeration valve (i.e. quite "the other way" than EGR), necessary for the operation of the catalyst.

Check the operation of the vacuum "fuel tap" - remove the vacuum hose from the "tap" and the fuel hose from the carburetor. In this state, the fuel should not be filtered from the fuel line, but instead should start pouring when you do a slight negative pressure (it should be enough to suck your mouth) in the hose to control the "tap".

When I wrote about the EGR, I meant the return of exhaust gases to re-burn them again. The diesel is in diesel and I have one in the bor. I checked the vacuum tap at the very beginning of my repair, and it is functional. I solved the problem in such a way that I bent the plate on the float and thereby lowered the fuel level in the carburetor. Now, after extinguishing the scooter, I have a blissful dryness in the filter, the carburettor is evenly set and the meringue candle is, only the scooter burns a bit, but it is probably because I raised the needles lower by the grooves, I need to set it as it was originally, the middle groove.

Moderated By tzok:

I see you are stubborn ... EGR can be in both gasoline and diesel engines. The EGR valve feeds some of the exhaust gas (depending on engine conditions) back to the intake manifold. The exhaust gas aeration valve on your motorcycle engine has a completely different purpose - through it fresh air is sucked into the exhaust manifold (thanks to the use of the Venturi effect) in order to ensure optimal conditions for the operation of the catalyst. Calling this EGR valve is like a generator on the starter (not to use a more explicit comparison). Such ignorance in terms of component names cannot be tolerated in the technical forum.

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