New Engine Won't Start

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hi,change the spark plug and make sure your head is on nice and tight, check the two bolts are tight.

Im having the same problem, i recieved my 27.2cc 4 bolt yesterday,tried for 2 hours to get it going earlier with no luck, changed my insulator gasket as it was abit creased,think the pulse hole maybe have been blocked as the airfilter was soaking with petrol.
I also swapped the stock carb spring for a shorter one,as the engine is supposidly thirsty,so will swap back, just be patient and work around your engine,you will sort it!
 
46u said:
I have had some engines to start and keep them running I had to lean out the LSN just a little and idle it up a bit. My race ported 30.5 I built was a real pain to get started the first time but it has much higher compression then a stock engine.

My next engine will be a 4 bolt all ready collecting parts. I have 4, 2 bolt motors and to this point (might change tomorrow) have not had a problem with any of them including my stock engine with well over 7 gallons on it. On the other three I built I torque all engine fasteners to factory specifications. If you over torque the cylinder bolts you good chance you will warp it and too loose the bolts will come out.

I will say if you are going to buy or build another engine go 4 bolt. Most of the engines I have where right before or just after they came out with 4 bolt engines and did not make a 36mm cylinder yet.

Sorry to say I read a lot of the HY carbs giving problems. If this is the case replace it with a true Walbor like comes on a Zen or CY.
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hi 46u, im having the same problem as you, but was told that they are hard to get going when new,then get easier as go along, i dremelled the coil myself to get correct gap and did swap the spring for the 12 pi one, how long was you messing with yhour 305 race engine before you got it going?
 
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