It is currently Mon May 29, 2017 3:04 pm



Post new topic Reply to topic  [ 10 posts ] 
Author Message
 Post subject: Joyner 250 Viper hard start assistance
PostPosted: Mon May 15, 2017 10:35 pm 
Offline
Buggy Enthusiast

Joined: Fri Jun 14, 2013 9:13 am
Posts: 257
Location: SoCal
Hello all,

I'm back. After my top rebuild last year, I seem to have a hard start issue. I can start it no problem with little ether on the Uni Filter.

I cleaned the carb so all the jets are clear. I also wrapped the exhaust and pipe with exhaust wrap. I did mess with the two valve timing adjustments.

My carb is at 2-1/2 turns. It was at 1-3/4 and was running lean.

I have a decel popping and exhaust got pretty hot, which is why I thought lean and clogged jets. New rubber hangers started melting, hence why I just installed the header/muffler wrap.

Spark plug is a perfect color.

She seems to run real well now after the cleaning and wrap, but trying to start from cold, it needs ether. Can't recall my jet sizes but they are not stock.

Any thoughts and/or suggestions?

_________________
2006 Joyner Viper 250cc
2005 Joyner Sand Viper 800cc to 2000cc - In Progress
1978 Honda Odyssey 250cc - In Pieces
1985 Honda ATC 250SX
2007 E-Ton Rover 90cc (Red)
2007 E-Ton Rover 90cc (Blue)
2002 KTM 250SX
2006 KTM 250SXF


Top
 Profile  
 
 Post subject: Re: Joyner 250 Viper hard start assistance
PostPosted: Mon May 15, 2017 11:15 pm 
Offline
Admin
User avatar

Joined: Wed Nov 28, 2007 2:21 am
Posts: 16861
Images: 24
Location: Pacific NW
What size pilot are you running? You may need a bigger one. My buggy runs a fat pilot 42 or 45 and I have to be careful not to flood the engine.

_________________
09 Joyner SandViper 250
08 Joyner SandViper 250 FOR SALE
57 VW Transport 1200 (Buggified)


Top
 Profile Personal album  
 
 Post subject: Re: Joyner 250 Viper hard start assistance
PostPosted: Tue May 16, 2017 8:55 am 
Offline
Buggy Enthusiast

Joined: Fri Jun 14, 2013 9:13 am
Posts: 257
Location: SoCal
PGH wrote:
What size pilot are you running? You may need a bigger one. My buggy runs a fat pilot 42 or 45 and I have to be careful not to flood the engine.


I know I should have wrote it down when I cleaned the carb but didn't. I probably documented it in an old thread here somewhere, will look. The problem is it was starting fine prior to the top end rebuild.

Could I have crossed the enrichment wires?

_________________
2006 Joyner Viper 250cc
2005 Joyner Sand Viper 800cc to 2000cc - In Progress
1978 Honda Odyssey 250cc - In Pieces
1985 Honda ATC 250SX
2007 E-Ton Rover 90cc (Red)
2007 E-Ton Rover 90cc (Blue)
2002 KTM 250SX
2006 KTM 250SXF


Top
 Profile  
 
 Post subject: Re: Joyner 250 Viper hard start assistance
PostPosted: Tue May 16, 2017 9:01 am 
Offline
Admin
User avatar

Joined: Wed Nov 28, 2007 2:21 am
Posts: 16861
Images: 24
Location: Pacific NW
The enriched is just a heating element that pushes out a needle - a t can be wired either direction. Since jetting was fine before, check your valve lash and timing.

_________________
09 Joyner SandViper 250
08 Joyner SandViper 250 FOR SALE
57 VW Transport 1200 (Buggified)


Top
 Profile Personal album  
 
 Post subject: Re: Joyner 250 Viper hard start assistance
PostPosted: Tue May 16, 2017 9:08 am 
Offline
Buggy Enthusiast

Joined: Fri Jun 14, 2013 9:13 am
Posts: 257
Location: SoCal
PGH wrote:
The enriched is just a heating element that pushes out a needle - a t can be wired either direction. Since jetting was fine before, check your valve lash and timing.


Yes, I was thinking it was valve timing too. They are adjusted from the outside, so not real sure how to get them spot on.

Oh, did find an old thread and I only changed out the main to 130. Pilot is stock, whatever that is.

_________________
2006 Joyner Viper 250cc
2005 Joyner Sand Viper 800cc to 2000cc - In Progress
1978 Honda Odyssey 250cc - In Pieces
1985 Honda ATC 250SX
2007 E-Ton Rover 90cc (Red)
2007 E-Ton Rover 90cc (Blue)
2002 KTM 250SX
2006 KTM 250SXF


Top
 Profile  
 
 Post subject: Re: Joyner 250 Viper hard start assistance
PostPosted: Tue May 16, 2017 9:38 am 
Offline
Admin
User avatar

Joined: Wed Nov 28, 2007 2:21 am
Posts: 16861
Images: 24
Location: Pacific NW
Valve timing is set by the position of the cam when the crank is at TDC. Valve lash is set by the two adjusters on the outside of the valve cover.

If you did not change to a big bore or anything else, the jetting should be pretty close to what you ran before. Verify what was touched before changing things that were not.

_________________
09 Joyner SandViper 250
08 Joyner SandViper 250 FOR SALE
57 VW Transport 1200 (Buggified)


Top
 Profile Personal album  
 
 Post subject: Re: Joyner 250 Viper hard start assistance
PostPosted: Tue May 16, 2017 10:41 am 
Offline
Buggy Enthusiast

Joined: Fri Jun 14, 2013 9:13 am
Posts: 257
Location: SoCal
Sorry, yes, valve timing is spot on as far as I remember. The lash is what I am not sure. I watched the one video on youtube and getting accurate is not very clear. It's just adjust intake till you hear the clicking stop and same for the exhaust.

_________________
2006 Joyner Viper 250cc
2005 Joyner Sand Viper 800cc to 2000cc - In Progress
1978 Honda Odyssey 250cc - In Pieces
1985 Honda ATC 250SX
2007 E-Ton Rover 90cc (Red)
2007 E-Ton Rover 90cc (Blue)
2002 KTM 250SX
2006 KTM 250SXF


Top
 Profile  
 
 Post subject: Re: Joyner 250 Viper hard start assistance
PostPosted: Tue May 16, 2017 1:50 pm 
Offline
Admin
User avatar

Joined: Wed Nov 28, 2007 2:21 am
Posts: 16861
Images: 24
Location: Pacific NW
You can adjust valve lash without the engine running by following the instructions in the Honda Helix service manual:

http://mpsracing.net/technical/helix-manual/index.html

_________________
09 Joyner SandViper 250
08 Joyner SandViper 250 FOR SALE
57 VW Transport 1200 (Buggified)


Top
 Profile Personal album  
 
 Post subject: Re: Joyner 250 Viper hard start assistance
PostPosted: Tue May 16, 2017 2:12 pm 
Offline
Buggy Enthusiast

Joined: Fri Jun 14, 2013 9:13 am
Posts: 257
Location: SoCal
Ok, I see it. Thanks for the link.

http://mpsracing.net/technical/helix-manual/03-06.html

_________________
2006 Joyner Viper 250cc
2005 Joyner Sand Viper 800cc to 2000cc - In Progress
1978 Honda Odyssey 250cc - In Pieces
1985 Honda ATC 250SX
2007 E-Ton Rover 90cc (Red)
2007 E-Ton Rover 90cc (Blue)
2002 KTM 250SX
2006 KTM 250SXF


Top
 Profile  
 
 Post subject: Re: Joyner 250 Viper hard start assistance
PostPosted: Wed May 17, 2017 7:36 am 
Offline
Buggy Addict
User avatar

Joined: Sun Nov 16, 2008 7:25 pm
Posts: 5186
Location: De Soto MO
You may want to run a compression check just to make the valves are sealing good. Just remember to have the throttle wide open when cranking the engine.

I lapped the valves prior to putting the springs on and checked them by putting carb cleaner and let it pool to verify leaking (head upside down) prior to assembly. Shouldn't I verify valve adjustment first before doing a compression test?

_________________
09 250SV Joyner Polaris 500 (SOLD)
here-we-go-again-joyner-polaris-500-swap-t46499.html
HH GTS150 stk 250SS wheels
Polaris Dark side ride


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 10 posts ] 


Who is online

Users browsing this forum: No registered users and 0 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Powered by phpBB © 2000, 2002, 2005, 2007 phpBB Group

blackLevel designed by GrafsS



phpBB SEO
© Buggynews.com - All Rights Reserved