Go Back   Motorcycle Forum > Motorcycle.Com General Discussion > Motorcycle Mods and Maintenance

Reply
 
Thread Tools
Old 10-25-2007, 12:42 PM   #1
jonnyddirks
Registered Member
 
jonnyddirks's Avatar
 
Join Date: Oct 2007
Posts: 11
Default Help!!!

Hi, I recently recieved a 1974 Yamaha DT250 enduro from a friend of mine. He said it was running when the guy gave it to him 2 years ago. I cleaned it up really good, replaced the battery, cleaned out the carb drained the gas and oil, put new oil and gas in. But I cant get it to start. When I try to start it black oil sprays out of the muffler. What do I do?!?!?
jonnyddirks is offline   Reply With Quote

Sponsored Links Remove Advertisements
Motorcycle Forum
Advertisement
Old 10-25-2007, 12:44 PM   #2
longride
Super Duper Mod Man

 
longride's Avatar
 
Join Date: Nov 2001
Location: Anywhere they let me
Posts: 10,479
Default

Quote:
Originally Posted by jonnyddirks View Post
Hi, I recently recieved a 1974 Yamaha DT250 enduro from a friend of mine. He said it was running when the guy gave it to him 2 years ago. I cleaned it up really good, replaced the battery, cleaned out the carb drained the gas and oil, put new oil and gas in. But I cant get it to start. When I try to start it black oil sprays out of the muffler. What do I do?!?!?

Ummmmmmmm...................Punt?
__________________
I'm a knucklehead
longride is offline   Reply With Quote
Old 10-25-2007, 12:52 PM   #3
Kenneth_Moore
Registered Member
 
Kenneth_Moore's Avatar
 
Join Date: Jun 2007
Location: VIsiting the GIft Shop in the Pit of DIspair
Posts: 7,118
Default

Sounds like the rings might be frozen, and the oil is entering the combustion chamber. I'd pull the plugs and put in some Marvel Mystery Oil (about an ounce) and cycle the engine a few times. Let it set for a week with the Marvel in it. Then crank it over a bunch with the spark plug out. If the plug is clean, put it in and see if it'll start. You could try some starting spray too, sometimes that will get it going.

If all that fails, punt.
__________________
www.kennethmoore.org
Kenneth_Moore is offline   Reply With Quote
Old 10-25-2007, 01:02 PM   #4
sarnali2
Aging Cafe` Racer

 
sarnali2's Avatar
 
Join Date: Jun 2007
Location: Sittin' down by my window, lookin' at the rain.
Posts: 8,719
Default

Did you check to see if you have spark? Lay the plug against the head and kick a few times, you should see a nice fat blue spark. Try freeing up the rings like K-K-K-Ken said...

If that fails, throw a Hail Mary..(they'll be expecting you to punt)
__________________
"Carpe` Throttelum -Loud Suits Save Lives"

"He said he's farting because of his medication"...
sarnali2 is offline   Reply With Quote
Old 10-25-2007, 01:11 PM   #5
jonnyddirks
Registered Member
 
jonnyddirks's Avatar
 
Join Date: Oct 2007
Posts: 11
Default

haha yea turns out I dont have a spark. The plug looks fine to me when i pull it off. I dont think thats the problem.
jonnyddirks is offline   Reply With Quote
Old 10-25-2007, 01:12 PM   #6
longride
Super Duper Mod Man

 
longride's Avatar
 
Join Date: Nov 2001
Location: Anywhere they let me
Posts: 10,479
Default

It could be so many things; spark, compression, ignition timing, muffler bearings. I'm sticking with punt. Do a quick kick on third down and fool em.
__________________
I'm a knucklehead
longride is offline   Reply With Quote
Old 10-25-2007, 01:14 PM   #7
jonnyddirks
Registered Member
 
jonnyddirks's Avatar
 
Join Date: Oct 2007
Posts: 11
Default

haha yea it turns out i dont have spark. But it dont think the spark plug is the problem. Would a burnt out haedlight cause it to have no spark?
jonnyddirks is offline   Reply With Quote
Old 10-25-2007, 01:18 PM   #8
pplassm
Founding Member
 
pplassm's Avatar
 
Join Date: Nov 2001
Posts: 3,875
Default

Black oil out the back end of a two-stroke? Sounds like somebody left the fuel tap open for 2 years and pre-mix leaked down into the crankcase. The fuel portion evaporated leaving black, oily residue. You may have to remove the top end (simple on this bike) and flush it out.

You need four things to run: spark, fuel, air, and compression.

Check for spark with a fresh plug grounded against the head.
Check for compression by plugging plug hole with a finger and turning the engine over.
Check for fuel by sniffing the plug after removal.
Check air filter and entrance for debris, mouse houses, etc.

Good luck, and contact me if you need it hauled away.
pplassm is offline   Reply With Quote
Old 10-25-2007, 01:21 PM   #9
jonnyddirks
Registered Member
 
jonnyddirks's Avatar
 
Join Date: Oct 2007
Posts: 11
Default

So i'm just curious. How much do you think it would cost to have a mechanic look at it and get it running?
jonnyddirks is offline   Reply With Quote
Old 10-25-2007, 01:24 PM   #10
pplassm
Founding Member
 
pplassm's Avatar
 
Join Date: Nov 2001
Posts: 3,875
Default

I should have read this first. I believe the bike in question had points. You may have to clean them, and they are behind the flywheel on the left side of the engine.

Good luck!
pplassm is offline   Reply With Quote
Reply


Thread Tools

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

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off