aperson
Active Member
- Messages
- 25
Hello everyone, I have a very peculiar issue with my G320rc out of my DBXL 2.0. It only had about a gallon ran though it when it suddenly stopped and wouldn't fire back up. I took it apart and found a scored piston and cylinder wall. I believe this was caused by me using an alcohol based air-filter oil and running in wet conditions causing the filter to dry up.
I ordered an OBR full mod top end kit and 2mm stroker crankshaft along with new ceramic crankcase bearings to turn it into G340. Fast forward two weeks and I've received my parts and rebuilt my engine and now I just can not get it to fire at all, no pops burbles or anything and I honestly do not know where to go from here. I've tried every conceivable thing trying to get this engine to start. Including swapping the carb, coil and plug from the zenoah and putting them on an old CY(?) 28cc from a smartech thunderbolt (remember those) that hasn't ran in YEARS. That engine was coaxed to life and idled fairly easily without any hassles. So surely I must of missed something on the zenoah I'm not aware of.
I know it's getting enough fuel as I've flooded it once already. Spark is good. Compression I am curious about as I didn't put an actual gauge on it but it seems that the zenoah is a tad bit easier to turn over by hand than the 28cc CY engine. It's not stupid easy to turn over but the CY has a better "kick" as it passes TDC. I'm not a total newbie to engine building having built a few full size engines before and also a lot of nitro rc engines but I'm not a total expert on how piston port gasoline two strokes work. So any suggestions no matter how simple or silly they may seem would be appreciated.
So far my troubleshooting list includes:
The basic checks for air, fuel, spark ( I didn't check compression with an actual gauge but it passes the finger test)
New spark plug
checked piston orientation (arrow towards exhaust)
Changed base gasket
Re-Redo of the sealant around the transfer ports
checked and messed around with the coil and spark plug gap
Tried starting without carb
squirted gasoline straight into intake and spark plug hole
Made sure the little ports in the carb and isolator were clear of debris
I ordered an OBR full mod top end kit and 2mm stroker crankshaft along with new ceramic crankcase bearings to turn it into G340. Fast forward two weeks and I've received my parts and rebuilt my engine and now I just can not get it to fire at all, no pops burbles or anything and I honestly do not know where to go from here. I've tried every conceivable thing trying to get this engine to start. Including swapping the carb, coil and plug from the zenoah and putting them on an old CY(?) 28cc from a smartech thunderbolt (remember those) that hasn't ran in YEARS. That engine was coaxed to life and idled fairly easily without any hassles. So surely I must of missed something on the zenoah I'm not aware of.
I know it's getting enough fuel as I've flooded it once already. Spark is good. Compression I am curious about as I didn't put an actual gauge on it but it seems that the zenoah is a tad bit easier to turn over by hand than the 28cc CY engine. It's not stupid easy to turn over but the CY has a better "kick" as it passes TDC. I'm not a total newbie to engine building having built a few full size engines before and also a lot of nitro rc engines but I'm not a total expert on how piston port gasoline two strokes work. So any suggestions no matter how simple or silly they may seem would be appreciated.
So far my troubleshooting list includes:
The basic checks for air, fuel, spark ( I didn't check compression with an actual gauge but it passes the finger test)
New spark plug
checked piston orientation (arrow towards exhaust)
Changed base gasket
Re-Redo of the sealant around the transfer ports
checked and messed around with the coil and spark plug gap
Tried starting without carb
squirted gasoline straight into intake and spark plug hole
Made sure the little ports in the carb and isolator were clear of debris