Great Power 38

Engine was fine on Wednesday but on Saturday would not start. Choke on, choke off multiple times no joy. Pulled plug out - dry! Dropped some gas into the cylinder and refitted plug. After a couple of flips it fired but would not rev up and then would stop, popping back in muffler. Fuel air mix too lean. Maybe carb clogged?

Today I lifted off the fuel pump cover. By the filter screen some tiny bits which I can only describe as "kettle fur." Cleaned it out and refitted. Not pumping fuel now. Oh, well, engine off and strip carb, blow everything out with my airline. Ordered some more fuel tubing. Hopefully it will run good again on Wednesday/Thursday.

Should have bought a DLE Phil, no messing around then. Just saying.....LOL

If your tank has a felt clunk - that could be the fluff or kettle fir in the filter screen

Denis Murphy wrote: Should have bought a DLE Phil, no messing around then. Just saying.....LOL

In reality Dennis you could be right. even my OS's have played me up.

Kevin Ross wrote: If your tank has a felt clunk - that could be the fluff or kettle fir in the filter screen

You could be right there Kevin. The fuel caddy has a felt clunk. Possibly the fibres are small enough get past the inline filters. I am replacing it with sintered bronze clunk.

Phillip Ford wrote:

Kevin Ross wrote: If your tank has a felt clunk - that could be the fluff or kettle fir in the filter screen

You could be right there Kevin. The fuel caddy has a felt clunk. Possibly the fibres are small enough get past the inline filters. I am replacing it with sintered bronze clunk.

Come to think of it now, last week I had carb issue with Pepsi, excessive rich at bottom end, flooding too. Cleaned out carb and re-kitted and fine now. Pepsi and the Extra 38 are the only planes recently flown regularly - coincidence?

Some of you may have noticed I have recently had starting issues with GP38 or just lately not starting at all. Sometimes firing but not running. Stripped down carb, found some gunk in filter so cleaned. Refitted the engine which is a bit of a fiddle. Still won't start. Put some fuel in plug hole and it will fire and stop. Spark is okay then. Ordered in a carb kit and replaced the parts anyway. Refit the engine and try again. problem has not gone away. I am losing patience now. Worn out from blipping prop too. :angry

I am starting to lose it! Still don't have a running engine even after cleaning it and fitting new parts. ordered a carb supposedly for GP38. Three days later it arrived and it is not the correct carb. it is for the GP76 Twin which is why the throttle arm's orientation was wrong for me. Sent back so total money wasted is £10 in postage. Ordered in another genuine Walbro kit and kitted the carb out again. Refitted the engine which is real pain in the ass due to the fiddly servo linkages. Tries to fire but still no joy. Checked plug and it's dry so it is fuel issue. I am at a loss now twice - engine not runing and no Extra to fly!

HELP Is there anyone within the club who is a master of small engines and carbs who can help me out? Preferably has a test bench set up for petrol motors which make it easier to fiddle with. GP38 has the same stand-off footprint as DLE35.

Phil, rcxel ignitions do often have problems with what I would guess are internal breakdowns on the HT side. These often only make themselves apparent at mid-to-high revolutions. I have a cheap ignition tester which mimics the hall-effect pickup and will take the ignition unit through from 0 to 12k rpm. I have heard some rcexcl ignitions squealing and watched the sparks go missing over certain rev ranges. I will test your ignition unit or you can borrow my tester.
Basically I have one of these www.ebay.co.uk/itm/284408370841?hash=ite...9:g:DqkAAOSwlvlf9gEk which I think Morris Mini Motors also sells!

Good idea to check the ignition John but had a chat with Phil last night and the basic problem does appear to be a dry engine - it fires after a neat prime but wont draw its own fuel