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SierraM37
  • Rank:XL Board Member
  • Posts:10
  • From:USA

Date Posted:07/14/2015 2:44 PMCopy HTML

So I was riding my old 125 and it suddenly lost power and died. Attempting to kick start I could tell there was no compression. In the garage, there appears to be compression at the plug hole and I'm wondering if perhaps a valve is stuck open or something. Doesn't make sense. Any thoughts? 
SierraM37 #1
  • Rank:XL Board Member
  • Posts:10
  • From:USA

Re:Perplexed - Compression/No Compression?

Date Posted:07/15/2015 5:02 PMCopy HTML

 Upon further inspection, the rocker arms don't move when I rotate the engine, leading me to believe the timing chain broke. Is there a way to replace the chain without removing and splitting the case? I've got both side covers off and don't see it yet. Is it behind the generator winding's?
redbug2 #2
  • Rank:XL Board Member
  • Posts:10
  • From:USA

Re:Perplexed - Compression/No Compression?

Date Posted:07/16/2015 10:59 AMCopy HTML

Yes, you can remove the chain without removing the engine... However, this is a zero tolerance engine and chances are if the chain has jumped or fallen off that your piston has come up and bent one of the valves.

You don't have to split the engine to get at the chain. Yes, it's behind the stator/flywheel.

If you have bent your valves you will have to remove the engine to get the head off and get at the valves, but you won't have to split the engine.


I would test to see if the valves are bent by removing the points cover, then the points plate, then the points cam advance mechanism. Then remove the camshaft cover. Take off the valve caps. Turn the cam until both valves are up. Or, just remove the camshaft. Then, kick over the engine... If you have no compression one or both of the valves are probably bent. If you are blowing air out of the carburetor then its the intake valve. Out of the exhaust then its the exhaust valve...

Good luck.


 

regards,

redbug2

SierraM37 #3
  • Rank:XL Board Member
  • Posts:10
  • From:USA

Re:Perplexed - Compression/No Compression?

Date Posted:07/21/2015 2:48 PMCopy HTML

 The chain indeed did jump off and the guide is worn to metal on the top, the chain wore some grooves in the case and the chain tensioner side came apart. The pocket that hold the chain guide has some new wear to it and it also has a crack, which would likely hold but maybe I should look to have it welded? When I was riding it, it just stopped running so perhaps the valves are not bent but easy enough to replace. Piston looks to be in good condition. Given there are likely metal frags inside the case, I don't see any choice but to split the case and give it a thorough cleaning and inspection. I may be able to get away with replacing the guide/tensioner and valves, perhaps the cam gear and put her back together. I don't want to pour a lot of money into a farm/cabin putt putt. What is the minimum I should do? Anyone have a link to a rebuild manual? 

If I do put her back together, should I look at getting a different chain sprocket? 
redbug2 #4
  • Rank:XL Board Member
  • Posts:10
  • From:USA

Re:Perplexed - Compression/No Compression?

Date Posted:07/23/2015 2:29 PMCopy HTML

I wouldn't split the case, but that's just me. You might break something else while doing it. Flush the engine with some kerosene or other solvent after you take the clutch cover off and any chunks from above should flush out.

Where is the pocket that holds the tensioner cracked? In the casing or the cylinder?

Ebay has replacement parts all of the time. Just put a search on and have it email you when the criteria for your search is met. You might even find a decent used engine for a reasonable price.

redbug2 #5
  • Rank:XL Board Member
  • Posts:10
  • From:USA

Re:Perplexed - Compression/No Compression?

Date Posted:07/23/2015 2:34 PMCopy HTML

You could test for valve bend by putting the head upside down and pouring some oil in the head area. If it leaks out you surely have a bent valve, if it holds liquid you may be fine.


 

If the piston has no visible signs of valve impact that is a good sign.

SierraM37 #6
  • Rank:XL Board Member
  • Posts:10
  • From:USA

Re:Perplexed - Compression/No Compression?

Date Posted:07/30/2015 4:00 PMCopy HTML

Here is a pic that says it all. The crack is in the U channel that holds the stationary chain guide. I don't think there is any pressure on this so not terribly worried. The chain ground down some of the inside of the case but integrity looks OK. More worried about shavings but as you suggested, wash, rinse and repeat with kerosene or some other solvent to get them out.


redbug2 #7
  • Rank:XL Board Member
  • Posts:10
  • From:USA

Re:Perplexed - Compression/No Compression?

Date Posted:07/31/2015 9:56 AMCopy HTML

 Can't see image. Chain wear in sides is not uncommon. Yes new chain and sprockets. Sometimes lower sprocket is impossible to get off so I leave it, it usually does not show as much wear. Make sure oil pump is working when you start it by loosening head bolt with oil channel. Oil should pump out under pressure... my first sl125 bent 3 sets of valves before I realized previous owner left oil pump o-rings out.... another sl100 I repaired owner hit right casing oil channel on rock, oil squirted out so he epoxied the channel.... oil stopped flowing and cam froze, chain jumped, valves bent.....
OZ_Sparklz #8
  • Rank:Diamond Member
  • Posts:1717
  • From:Australia

Re:Perplexed - Compression/No Compression?

Date Posted:07/31/2015 10:33 AMCopy HTML


Image in Post # 6...





redbug2 #9
  • Rank:XL Board Member
  • Posts:10
  • From:USA

Re:Perplexed - Compression/No Compression?

Date Posted:09/02/2015 11:41 AMCopy HTML

I think that will hold. I would jbweld around it to bolster it's strength.


Go soothingly on the grease mud ... as there lies the skid demon! ...





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