SV-26 trouble

Home

My FlyingGiants

Blogs

Classifieds

FORUMS

Members

News

Search

Find New Posts

All Forums

Subscribed Forums

View Unanswered Threads

Search Forums

Show Posts Show Threads

Advanced Search

Tools

Post Hucker

Mark Forums Read

Sign Up!

rosie-riveter · 07-01-2009, 08:45 PM

I just started a new SV-26 and i'm having issues. It started and ran for around a minute or so but it was rough, now all it wants to do is fire up and then die instantly. I have moved the needles everywhere from 1 turn to 2 1/2 turns and its the same thing. The stock settings were 1 1/2 on the low end and 1 on the high end. It's pulling fuel to the carb no problem and there aren"t any air bubbles. Any ideas?

Neogenesis · 07-01-2009, 09:17 PM

If it fires and then dies, almost sounds like it's running off prime. Possibly a partial blockage in the carb?

Neo

rosie-riveter · 07-01-2009, 11:51 PM

I took the carb apart and everything looks good. Clean as a whistle.

catfish2 · 07-02-2009, 12:06 AM

Maybe check the fit of the fuel line to the carb nipple. I have another brand 26 that suddenly would not run past idle speed. Took me two days to find this. Apparently the plastic nipple on mine is slightly undersized from normal on the bigger carbs. Zipped tied the line and all is now well.

mrbigg · 07-02-2009, 12:09 AM

open the needles up further. go 3.5 to 4 turns out.

rosie-riveter · 07-02-2009, 01:42 AM

Okay, I just spent another hour or two messing with it. No dice. I completely cleaned the carb out and blew out all the orifices with my compressor, removed the screen etc. It will start and run for maybe 2 or 3 seconds and die. I opened the needles up to 4 turns and then gradually backed them in. It won't even try with them opened way up. When I get down around 1 1/2 is when it will start. I'm ready to hit it with a hammer but I know it's probably something simple. Is there a chance that the ignition may be shutting down and if so is there a way I can check it? I double checked the timing and it was set at 45 degrees which seemed a bit to advanced in my opinion so I backed it down to 30 BTC and it didn't seem to make a bit of difference. It has a decent spark, not as good as some I have seen but it's firing it. I made sure that the battery was good also. Anything else other than send it to Ralph? I want to get this baby flying rather than shipping it off.

catfish2 · 07-02-2009, 04:03 PM

Try using a completely different fuel tank and then try using a different battery plugged directly into the ignition.

rosie-riveter · 07-02-2009, 11:55 PM

It's running finally. I'm at about 1 turn each on the needles but it sounds okay. The transition is snappy as hell with a XOAR 16X8. I think I may be a bit underpropped. I'll try a 17X8 tomorrow.

rosie-riveter · 07-04-2009, 09:12 PM

Well it was running good for a minute. I got about 3/4 of a tank through it then it died again. I've had the carb off three or four times and it's so damn clean you could eat off of it. The needle is set right and everything looks great. Damned if I know. I'm ready to chuck the whole thing if I had a replacement.

mrbigg · 07-09-2009, 10:47 AM

check you fuel tank's clunk.

T. Bob · 07-09-2009, 10:50 AM

	Quote:
	blew out all the orifices with my compressor

That sounds painful.

husker · 07-09-2009, 11:01 AM

sounds like your clunk came off or you have a leak in the line

rosie-riveter · 07-10-2009, 07:35 PM

Found the problem, bad ignition. Damn all them hours messing with the carb. Thanks for all the input guys.

CA$HEY · 07-10-2009, 08:03 PM

When you get it soughted,,move the sensor as far as you can go in the direction of the prop,,then re tune

rosie-riveter · 07-10-2009, 08:33 PM

I did that, it's still at about 32 degrees BTDC but it seems to run good. I just hope it doesn't run especially hot.

07-01-2009, 08:45 PM	#1
rosie-riveter Super Contributer Join Date: Jun 2009 Posts: 144	SV-26 trouble I just started a new SV-26 and i'm having issues. It started and ran for around a minute or so but it was rough, now all it wants to do is fire up and then die instantly. I have moved the needles everywhere from 1 turn to 2 1/2 turns and its the same thing. The stock settings were 1 1/2 on the low end and 1 on the high end. It's pulling fuel to the carb no problem and there aren"t any air bubbles. Any ideas?

07-01-2009, 09:17 PM	#2
Neogenesis Down Low..Too Slow..DOH!! Join Date: Jan 2006 Location: Findlay, OH Posts: 1,188	Re: SV-26 trouble If it fires and then dies, almost sounds like it's running off prime. Possibly a partial blockage in the carb? Neo __________________ Fly it like you stole it!!!

07-01-2009, 11:51 PM	#3
rosie-riveter Super Contributer Join Date: Jun 2009 Posts: 144	Re: SV-26 trouble I took the carb apart and everything looks good. Clean as a whistle.

07-02-2009, 12:06 AM	#4
catfish2 Gettin' Lower! Join Date: Oct 2008 Location: Tyler, Tx Posts: 51	Re: SV-26 trouble Maybe check the fit of the fuel line to the carb nipple. I have another brand 26 that suddenly would not run past idle speed. Took me two days to find this. Apparently the plastic nipple on mine is slightly undersized from normal on the bigger carbs. Zipped tied the line and all is now well.

07-02-2009, 12:09 AM	#5
mrbigg Scratch Building ARF Assembler Join Date: Jan 2006 Location: Illinois Posts: 302	Re: SV-26 trouble open the needles up further. go 3.5 to 4 turns out.

07-02-2009, 01:42 AM	#6
rosie-riveter Super Contributer Join Date: Jun 2009 Posts: 144	Re: SV-26 trouble Okay, I just spent another hour or two messing with it. No dice. I completely cleaned the carb out and blew out all the orifices with my compressor, removed the screen etc. It will start and run for maybe 2 or 3 seconds and die. I opened the needles up to 4 turns and then gradually backed them in. It won't even try with them opened way up. When I get down around 1 1/2 is when it will start. I'm ready to hit it with a hammer but I know it's probably something simple. Is there a chance that the ignition may be shutting down and if so is there a way I can check it? I double checked the timing and it was set at 45 degrees which seemed a bit to advanced in my opinion so I backed it down to 30 BTC and it didn't seem to make a bit of difference. It has a decent spark, not as good as some I have seen but it's firing it. I made sure that the battery was good also. Anything else other than send it to Ralph? I want to get this baby flying rather than shipping it off.

07-02-2009, 04:03 PM	#7
catfish2 Gettin' Lower! Join Date: Oct 2008 Location: Tyler, Tx Posts: 51	Re: SV-26 trouble Try using a completely different fuel tank and then try using a different battery plugged directly into the ignition.

07-02-2009, 11:55 PM	#8
rosie-riveter Super Contributer Join Date: Jun 2009 Posts: 144	Re: SV-26 trouble It's running finally. I'm at about 1 turn each on the needles but it sounds okay. The transition is snappy as hell with a XOAR 16X8. I think I may be a bit underpropped. I'll try a 17X8 tomorrow.

07-04-2009, 09:12 PM	#9
rosie-riveter Super Contributer Join Date: Jun 2009 Posts: 144	Re: SV-26 trouble Well it was running good for a minute. I got about 3/4 of a tank through it then it died again. I've had the carb off three or four times and it's so damn clean you could eat off of it. The needle is set right and everything looks great. Damned if I know. I'm ready to chuck the whole thing if I had a replacement.

07-09-2009, 10:47 AM	#10
mrbigg Scratch Building ARF Assembler Join Date: Jan 2006 Location: Illinois Posts: 302	Re: SV-26 trouble check you fuel tank's clunk.

07-09-2009, 11:01 AM	#12
husker Riley O'Brien Join Date: Oct 2008 Location: Waverly, NE Posts: 1,899	Re: SV-26 trouble sounds like your clunk came off or you have a leak in the line

07-10-2009, 07:35 PM	#13
rosie-riveter Super Contributer Join Date: Jun 2009 Posts: 144	Re: SV-26 trouble Found the problem, bad ignition. Damn all them hours messing with the carb. Thanks for all the input guys.

07-10-2009, 08:03 PM	#14
CA$HEY $$ Join Date: Mar 2006 Location: australia Posts: 272	Re: SV-26 trouble When you get it soughted,,move the sensor as far as you can go in the direction of the prop,,then re tune __________________ EATUM AND SMILE

07-10-2009, 08:33 PM	#15
rosie-riveter Super Contributer Join Date: Jun 2009 Posts: 144	Re: SV-26 trouble I did that, it's still at about 32 degrees BTDC but it seems to run good. I just hope it doesn't run especially hot.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
RC Showcase and SV engines	pcsol	Gas Engines	9	12-22-2009 03:40 AM
XYZ 26 CC COWLING ISSUE	jarealty	Gas Engines	7	11-23-2009 09:45 PM
DA85 Vess 26B or Xoar 26 x 10	cwhite	Gas Engines	3	02-13-2009 12:51 PM
RCS SV 26 ?	starzak	Gas Engines	0	01-16-2009 09:16 PM
All of a Sudden Having trouble accessing site	Freddy Warbird	Site Chat	8	12-06-2006 01:36 AM