ADVrider

Go Back   ADVrider > Bikes > Thumpers
User Name
Password
Register Inmates Photos Site Rules Search Today's Posts Mark Forums Read

Reply
 
Thread Tools Search this Thread Display Modes
Old 02-19-2013, 05:03 PM   #1
john479 OP
Gnarly Adventurer
 
john479's Avatar
 
Joined: Feb 2011
Location: United Kingdom
Oddometer: 113
Honda XL500R starting problem

Hi all,
I'm in need of a little advice on my XL500R restoration.

I can't get it to start or when it does, it only runs for 5 seconds. I've found that if I hold my manual decompression lever on and kick it over to prime it and then kick it, it sometimes does start but for only about 5 seconds. This makes it sound like a fuel problem but I've thoroughly cleaned the carb and used a good rebuild kit. It has a good spark and plenty of compression, so much that when trying a bump start, it locks the back wheel up. Tried a different CDI but exactly the same.

Anyone got any ideas?

Thanks,

John
john479 is offline   Reply With Quote
Old 02-19-2013, 05:06 PM   #2
john479 OP
Gnarly Adventurer
 
john479's Avatar
 
Joined: Feb 2011
Location: United Kingdom
Oddometer: 113
More info

I'm getting good flow throught the petcock and needle. Can't see I have an intake leak as I've changed the o-rings on the rubber boot and spacer and they''re done up tight. Exhaust is fine as I tried it without the exhaust and it did the same thing - ran for a few seconds if I prime it with full choke, holding decompression lever in. Then big kick and it will start but die after a few seconds. Does behave like fuel starvation.

I'll try a squirt of easy start and see if it fires. Bike is 1982 so single carb

Thanks
john479 is offline   Reply With Quote
Old 02-25-2013, 03:32 PM   #3
Andyvh1959
Cheesehead Klompen
 
Andyvh1959's Avatar
 
Joined: Feb 2012
Location: Da frozen tundra eh? 1.5 mile west of Lambeau
Oddometer: 664
When you say you cleaned the carb, did you actually completely disassemble it and clean all internal passages and jets manually? When I do this I use strands of copper wire pulled from 12ga or 16ga wire and I push it through all the jet holes and carb passages. Then I blast them all out with carb cleaner. Then I blast them all out with compressed air.

This is the only thorough way I know to really clean a carb. No amount of soaking or carb cleaner does it without actual breakdown and manual cleaning.

That said, is the float level properly set? Any internal screen/strainer in the carb cleaned? Is the fuel shut-off valve in the carb free to open and clear? That is the little valve above the float level arm.
__________________
When life throws you a curve,.....lean into it!
42+ year rider, 22+ year MSF Coach, Street, Dirt, Ice, ride em all!
Andyvh1959 is offline   Reply With Quote
Reply

Share

Thread Tools Search this Thread
Search this Thread:

.
Display Modes

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 On

Forum Jump


Times are GMT -7.   It's 01:08 AM.


Powered by vBulletin® Version 3.8.5
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Copyright ADVrider 2011-2014