Sachs 1978 still no power

Just bought it and gave it new fluids, new spark plug, cleaned the gas tank and lines, the carb looked pretty spotless but the seal on the float cap looks compromised.

After I started it up it ran at first, still with the same minimal power (like I could peddle it faster) as before the cleaning. I could barely move back the throttle without having the engine chug to even lower power. After the tuk tuk run I am now having trouble starting it again.

Any insight?

It wants to be great it just needs a little help!

Thanks gang

Adam

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Re: Sachs 1978 still no power

Compression test?

Re: Sachs 1978 still no power

> Stephen Simmons Wrote:

> -------------------------------------------------------

> Compression test?

Haven't tried that one yet, I need to find a gauge to read it though.

Re: Sachs 1978 still no power

Try blocking off your decomp, clean your points and set the timing. Beautiful bike, hope you get it running right!

Re: Sachs 1978 still no power

♣Slew Foot♣ /

BTW all the bulbs and the brake lights sensors need to work properly for it to start rite up and run . Unless you bypass the safety on the high-tension coil and the brakelights return ground .

Re: Sachs 1978 still no power

> tom toczek Wrote:

> -------------------------------------------------------

> Try blocking off your decomp, clean your points and set the timing.

> Beautiful bike, hope you get it running right!

this exactly. the brakelight comment is valid for post 78 ignitions I think. if there's 4 wires, and one is black and blue, then definitely true, try just grounding the blue/blk wire to bypass that issue.

But tom's right, the 2 most likely are timing - often sachs restricted their engines intentionally by setting timing waaaaaayyyy too advance, plus the 505's are notorious for shearing the woodruff keys which also ruins timing. and of course while in there clean the points anyway. If your woodruff key is sheared, your buest bet is usally just running no key, lap the taper and pressfit it on in the right location for the timing (see fred's guide in the wiki for more timing details). The key is usally just to line up timing anyway and not necessary.

And #2 is definitely the decomp. theyre also notoriously problematic with sachs. Search "505/1a performance" in the wiki, scroll down there's a section on blocking the decmp.

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