New Engine running - no power

[Predator303]

Just the motor without carb. Its a 66 SkyHawk and a NT Carb. The carb ran great before on the old engine.
Here are pics of the new one before turned it on:

http://motorbicycling.com/showthread.php?t=42469

 

[Predator303]

Both heads are origented plug pointed back but the SkyHawk has another combution champer. It seems smaller but on the other hand my old head didnt head the "Ring" around it where it lies on the gasket to the cylinder. I think they took that off for higher compression. But I will go out now and test it again with the old head.

 

[Predator303]

Alright. Its louder now, compression is a little higher but still nowhere near to how my old non SkyHawk was. BUT I cant seem to get the throttle up. Its like stuck as if it was warm on choke. IT doenst run smooth and would just turn off and I am getting no idle at all.

 

[JonnyR]

have you tryed to adjust the fuel to make it run better not the idle screw

 

[Predator303]

You mean the clip needle position?

 

[Predator303]

OK I tested a few things. Its slightly better with the old head but still no power, sound, compression. The carb. problem was the spark plug. The one they sent me was crap. I used my old NKG and it ran smooth. Smooth but no power. Before with my old engine when I pushed it a little to get some speed (without paddling) it turned maybe 2-3 times in a couple feet of distance and it was hard to turn it on unless I have more speed or tried it couple times. Now, when I do the same the engine turns like it doesnt have a spark pulg in. Way too easy. So I am assuming its something in the cylinder itself.

 

[Predator303]

OK. I got the front of the bike up so the piston is horizontal, sprayed in WD40 and it immediately ran down the cylinder. Im going to call GasBike to see if they can send me another head kit.

 

[Bikeguy Joe]

Sounds like the cylinder may be out of round. Not a problem with the head, but with the jug.

 

[Predator303]

I just took off the cylinder and it looks to me by seeing the oil film at one place in the cylinder that one of the piston rings didnt seal. I dont know if it helps but I turned the piston rings 180 degr. to the other side (they are very loose) and see if something changes. Otherwise I will be trying to get a new head kit but they told me I have to call Monday for techn. support. Bah

 

[JonnyR]

the piston rings only go in one way in these motors the gap has to be in a spacific spot not to catch on anything

 

[Predator303]

I bet but I will stalk their asses until they will do something. When I bought a Centr. Clutch and it broke in a million pieces after a week they told me to send it back for refund but it wasnt really worth it due the shipping.

 

[Predator303]

OK I checked the rings and turned them once around back to the right position and now its holding the liquid in the cylinder!!! Lets hope that fixed it!

 

[JonnyR]

sounds like they needed to be reseated i hope you didnt kill your jug gasket where it seals to the case

 

[bigbutterbean]

Sounds like an improperly seated ring was the problem. As long as the ring didnt scratch the cylinder wall, it should be fine. Let us know how it works out for you.

 

[Predator303]

OK well I just came back from another test drive. It is much better now but I would still say the compression level is nowhere near of my old engine. But its better, sounds louder more powerful than before and accelerate better. I will let it cool down now again and put up the old head one last time. I still want to change the top end but lets see how it is driving it a while on the weekend. I have to wait for monday anyways to call them again.

 

[bigbutterbean]

It will develop more power after break-in.

 

[JonnyR]

good to hear lowrider it would have sucked if you would have needed anything replaced by ga$bike they arnt known for there customer service

 

[Predator303]

I still think it need to be replaced but I will go out now and run it little more on the way to buy better oil and maybe a fresh cold coconut at the beach I just finished installing the old head which I think have higher compression. Thanks everybody for the help. I love the people in this forum. Always interesting and something new to learn.

 

[Predator303]

Hello again I drove it a while and it got more power but not as it was with the old engine (still). But I think one of the reasons is the ignition timing. It seems to be off. Thats just how it feels because even if Im standing and I try to rev up with clutched pulled there is a lag first and nothing really happens. With full throttle its a little better while driving. But everything seems really slow, even how the engine rev up. In this case thats a carb problem and not the compression and I wonder how I can fix that. The only thing I dont know so well to deal with is he carb yet. Is there a way to adjust the ignition timing with the magneto or is it even possible at all?

 

[JonnyR]

i would start at the carb which one is it?