Notices
YS Engines Support Direct support from YS Performance Engines by Dave Shadel

Ys175 cdi

Old 06-14-2013, 05:41 PM
  #1  
jkruger
Thread Starter
 
Join Date: Dec 2002
Location: Yuma, AZ
Posts: 61
Likes: 0
Received 0 Likes on 0 Posts
Default Ys175 cdi

Had an interesting happening running a new YS 175 CDi on a test stand. Using a glow plug instead of the CDi. Engine started easily and ran at low throttle for a couple of minutes then when I advanced throttle the spinner bolt broke. Went back to low throttle with no problems and shut down motor. Prop bolts still tight and no sign of backfire or reverse direction. Suggestions?
Old 06-17-2013, 03:27 PM
  #2  
Salander
Junior Member
 
Join Date: Jun 2013
Location: z
Posts: 5
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Ys175 cdi



What needle setting did you use? Make sure that you run it rich compared to a cdi setup to take into account the glow plug.



Also, if it was a new APC, they have a habit of needing to be retightened after a while, otherwise it may slip or the spinner back plate may slip.



Old 06-18-2013, 02:06 PM
  #3  
jkruger
Thread Starter
 
Join Date: Dec 2002
Location: Yuma, AZ
Posts: 61
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Ys175 cdi

Had the needle valve at 2 1/2 turns. The spinner screw just sheared.
John
Old 06-19-2013, 01:07 AM
  #4  
XMANS
Senior Member
 
Join Date: Aug 2004
Location: MilduraVictoria, AUSTRALIA
Posts: 157
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Ys175 cdi

When you installed the prop etc did you align one blade vertical in line with TDC, if so did you check if the prop blade was still in line with TDC.

If not still aligned you suffered a back fire of some degree, if it was still aligned and all was tight as stated you most likely had a failure of the spinner
bolt. I have seen many bolts suffer from fatigue and break.

As a matter of interest you shouldn't use a spinners alum back plate directly against the drive washer, the splines do not align, a
good alternative is to use a servo disc, the big round one's, and drill out the center to suit your crankshaft and install between back plate and drive
washer, when prop nut is tightened the plastic disc then deforms and takes on the spline shape of each side.
Saves the stripping of the drive washer splines when you have a backfire,
And yes people complain about the spinner gap being too big and then remove it.

YOU CAN LEAD A HORSE TO WATER BUT YOU CAN'T MAKE IT DRINK.

YS SERVICE DOWN UNDER
Old 07-21-2013, 10:07 AM
  #5  
ThunderBoat42
My Feedback: (1)
 
ThunderBoat42's Avatar
 
Join Date: Feb 2013
Location: Alabaster, AL
Posts: 708
Received 5 Likes on 3 Posts
Default RE: Ys175 cdi

GOOD TIP XMANS
Old 11-21-2014, 07:33 PM
  #6  
kevenoco
My Feedback: (1)
 
kevenoco's Avatar
 
Join Date: May 2005
Location: Houston, TX
Posts: 67
Likes: 0
Received 0 Likes on 0 Posts
Default

J. Krueger,
I know this is an old posting but did you figure this one out? I'm having the exact same problem. I cannot get to full throttle with a glow plug on the 175 CDI without pre-ignition.
Old 11-21-2014, 09:06 PM
  #7  
Dave Harmon
 
Join Date: Jul 2002
Location: Sperry, OK
Posts: 680
Likes: 0
Received 1 Like on 1 Post
Default

Originally Posted by kevenoco View Post
J. Krueger,
I know this is an old posting but did you figure this one out? I'm having the exact same problem. I cannot get to full throttle with a glow plug on the 175 CDI without pre-ignition.
It is too lean.....open the needle valve.
Old 11-24-2014, 06:24 AM
  #8  
speedracerntrixie
My Feedback: (29)
 
speedracerntrixie's Avatar
 
Join Date: Jun 2010
Location: Happy Valley, Oregon
Posts: 8,129
Received 68 Likes on 65 Posts
Default

Just curious here, what is the reason for running the engine on a glow plug if it is intended for CDI?
Old 11-24-2014, 06:56 AM
  #9  
kevenoco
My Feedback: (1)
 
kevenoco's Avatar
 
Join Date: May 2005
Location: Houston, TX
Posts: 67
Likes: 0
Received 0 Likes on 0 Posts
Default

A lot of people prefer it that way to eliminate the weight and complexity of the CDI equipment. (KISS). I am currently troubleshooting some motor issues so I just wanted to make the diagnosis simpler. I prefer the CDI personally.

I was told that an additional head gasket is required to reduce the compression for use with a glow plug. I never tried it out though.
Old 11-24-2014, 08:49 AM
  #10  
Dave Harmon
 
Join Date: Jul 2002
Location: Sperry, OK
Posts: 680
Likes: 0
Received 1 Like on 1 Post
Default

Originally Posted by kevenoco View Post
A lot of people prefer it that way to eliminate the weight and complexity of the CDI equipment. (KISS). I am currently troubleshooting some motor issues so I just wanted to make the diagnosis simpler. I prefer the CDI personally.

I was told that an additional head gasket is required to reduce the compression for use with a glow plug. I never tried it out though.
Try back flushing the needle valve assy.
I have had a lot of trouble with silicone chips that are almost invisible caused by Du-Bro fuel line. This line is very soft and very easy to gouge when installed as well as having trash in it before use.
You will have to remove the needle valve brass assy from the carb and back flush the carb housing.
I also flush all fuel line before use....all this has solved most of my problems such as yours.
Of course I use a filter but the silicone chips were already in the carb and fuel line.
I have run my engine a lot on glow and it does not require another head gasket.


Dave
Old 11-24-2014, 06:10 PM
  #11  
kevenoco
My Feedback: (1)
 
kevenoco's Avatar
 
Join Date: May 2005
Location: Houston, TX
Posts: 67
Likes: 0
Received 0 Likes on 0 Posts
Default

Thanks Dave. Just to be clear we're talking about the 175 right? I can run a glow plug in my 170 no problem.

Where are you running your HS needle on your 175 with the glow plug? With CDI I am at 5/6 out but with glow plug I am still predetonating even at 2 turns out.

My motor runs great now with CDI but couldn't get it up to full throttle with a glow plug. My fuel passageways are clean.
Old 02-24-2015, 02:35 AM
  #12  
Bustabloodklaart
Member
 
Join Date: Apr 2009
Location: London, UNITED KINGDOM
Posts: 64
Likes: 0
Received 0 Likes on 0 Posts
Default

Couple observations based on 6 years YS ownership,,,,
The reason most people run initially with a glow is for running in purposes.
All the symptoms above are fuel (ie lack) related. either open the main needle more
and/or check the clunk in the tank.
Xman's tip above with the servo disc is a cracker as is using a cut down sanding disc
or piece of liteply cut into a disc, Either that or welcome to the world of YS propdriver
replacement
Doubtless some of the guys here will read the following and think "I've never" etc etc
but again based on years and lots of use, get used to tightening your prop nuts at
least every 30 or so runs as a precaution.
PS
If you can always splash out a few pennies more and buy YS fuel tube.

Last edited by Bustabloodklaart; 02-24-2015 at 02:37 AM.
Old 07-30-2015, 04:12 AM
  #13  
jkruger
Thread Starter
 
Join Date: Dec 2002
Location: Yuma, AZ
Posts: 61
Likes: 0
Received 0 Likes on 0 Posts
Default

After a couple of years because of a move, got back to my 175 cdi. Opened the needle to 3 full turns and it ran fine until the black check valve came off the head. How exactly is that part attached to the engine?
John
Old 07-30-2015, 05:27 AM
  #14  
kevenoco
My Feedback: (1)
 
kevenoco's Avatar
 
Join Date: May 2005
Location: Houston, TX
Posts: 67
Likes: 0
Received 0 Likes on 0 Posts
Default

I think it's originally press fit only. YS has told me to sand up the surfaces and apply a very light coat of JB Weld and hammer it back in. This has worked on my 170. Use a nut driver on the plastic injector and hammer on that.
Old 07-30-2015, 01:52 PM
  #15  
petec
My Feedback: (58)
 
petec's Avatar
 
Join Date: Jan 2002
Location: Beaver Falls, PA
Posts: 2,078
Likes: 0
Received 1 Like on 1 Post
Default

If the injector came out cleanly from the head, meaning that whole brass body came out and the aluminum of the head is intact, then you can clean the whole thing with denatured alcohol to remove fuel residue. Once that is done use a small jewelers file to rough up the opening in the head and the brass of the injector. The end result you are looking for is not to remove material as much as provide a reply good rough surface, almost like very light threads, for the JB weld to bite into. Then mix up some JB Weld and apply a thin coat to the injector. Once that is done press the injector back into the head.

Now if the injector is broken that is a different story and will require a trip to Richard for repair and maybe a new head.

Does that help?
Old 08-01-2015, 04:56 AM
  #16  
jkruger
Thread Starter
 
Join Date: Dec 2002
Location: Yuma, AZ
Posts: 61
Likes: 0
Received 0 Likes on 0 Posts
Default

The brass piece broke and after talking to Richard I will send the engine to him for repair. Thanks
Old 08-01-2015, 03:50 PM
  #17  
spaceworm
 
Join Date: Mar 2009
Location: Guilford, CT
Posts: 3,935
Received 1 Like on 1 Post
Default

Originally Posted by jkruger View Post
The brass piece broke and after talking to Richard I will send the engine to him for repair. Thanks
Please excuse my ignorance, but who is "Richard"? I don't need him (yet), but would be good to know about him. Thanks.

Sincerely, Another Richard

YS F-120/Hangar 9 100 inch J3 Cub
Old 08-01-2015, 06:03 PM
  #18  
tande
Senior Member
My Feedback: (48)
 
Join Date: Dec 2003
Location: Millington, MI
Posts: 990
Likes: 0
Received 0 Likes on 0 Posts
Default

Originally Posted by spaceworm View Post
Please excuse my ignorance, but who is "Richard"? I don't need him (yet), but would be good to know about him. Thanks.

Sincerely, Another Richard

YS F-120/Hangar 9 100 inch J3 Cub
Last I knew, he called this place home away from home.......
Old 08-02-2015, 04:33 PM
  #19  
petec
My Feedback: (58)
 
petec's Avatar
 
Join Date: Jan 2002
Location: Beaver Falls, PA
Posts: 2,078
Likes: 0
Received 1 Like on 1 Post
Default

Originally Posted by spaceworm View Post
Please excuse my ignorance, but who is "Richard"? I don't need him (yet), but would be good to know about him. Thanks.

Sincerely, Another Richard

YS F-120/Hangar 9 100 inch J3 Cub
Richard Verano is the owner of YS Parts and Service. He is the North America YS distributor and all around YS guru.

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service - Do Not Sell My Personal Information -

Copyright 2021 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.