|Topic Review (Newest First)|
|04-30-2019 07:12 PM|
its more important, to have non-ethanol, when using atv's, weed whackers, an chainsaws.
newer car's are designed to run on the junk. putting real gas in a newer car, or, what ever, can cause damage.
|04-30-2019 03:20 PM|
Originally Posted by LedFTed View Post
|04-29-2019 07:59 PM|
your dad is correct about not using ethanol gas. using ethanol gas, despite the warnings,
i dont have a definition for that.
|04-29-2019 07:45 PM|
Originally Posted by retro View Post
|04-28-2019 09:39 PM|
Take the small plug bolt out of the end of the adjuster 1st. 8mm socket gets it I think? Then roll the motor over by hand in its normal direction of rotation until it is on the compression stroke. All four valves will be closed and there will be no load on the camshaft at this point. Do NOT turn the motor over backwards at any time, not ever.
Then take the two bolts out of the adjuster and remove it from the cylinder. The adjuster will auto-extend to its maximum length under its own spring pressure as you pull it away from the cylinder. Once it is out simply hold it back against the chain guide firmly with your fingers, as if you were gonna reinstall it.
Now make a note of the distance between the adjuster gasket and cylinder. Any gap 3/8" or narrower indicates that the chain is completely worn out and should be replaced immediately. Between 3/8" and 7/16" means ya got a bit of time to make plans and order in all of the parts. 1/2" or more gap means the chain and guides are still in good condition.
To reassemble it, use a narrow flat blade screwdriver (inserted in the hole in the end where you removed the small plug) to crank the tensioner back in to its shortest length, then stick a piece of mechanics wire in alongside that screw to jam it temporarily to hold the tension back while you reinstall the two mounting bolts. The service manual shows ya how to use that trick... Once you've got the two bolts snugged up insert your screwdriver again and release the wire that you jammed in there. The tensioner should auto-extend back out against the chain guide rapidly, you'll hear it.
Final two steps, rotate the crank again by hand in the normal direction for at least two complete turns. Then put the plug back into the end of the tensioner and snug it up.
|04-28-2019 10:48 AM|
Originally Posted by retro
I’ll check out the shindy kits. The carb parts are kind of pricy piece by piece from Honda.
|04-27-2019 08:23 PM|
It sounds like you are fine with compression since it doesn't use a bit of oil. I wouldn't put any money into more tools to get better accuracy, just adjust the valves and check the timing chain by yanking the slack adjuster and see how much plunger length remains.
As @misterclean59 mentioned, you'll probably find a worn jet needle and holder/needle jet in the carb making it run rich above idle speed. A Shindy kit will have everything you'll need... can't remember if you get a new needle and holder in those kits though...
|04-27-2019 07:57 PM|
Originally Posted by retro View Post
He’s anal about not using ethanol gas and always treats his gas, but I doubt seriously the carb has ever been off of it, so it could probably use a cleaning/rebuild. I cleaned the air filter a few weeks ago.
It doesn’t use any oil and the plug was not wet, albeit black with soot/carbon. It was also only finger tight. I’ve got a scope and meant to have a look in the chamber but forgot. I’ll probably wet check the compression though, so I’ll have a look around in there then. I’ve been meaning to get a leak down tester to check my old pickup, so I may do that also.
The adapter on my compression tester does not have a valve. The end up the hose that screws into it does. The adapter is also a lot shorter than the plug. I’ll look around and see if I have another one. Use too but haven’t seen it around in a while, so it may have walked off.
|04-27-2019 09:05 AM|
Yep, these small displacement ATV motors are very unforgiving to swept volume losses in compression tester adapters. If yours does not have a low-pressure schrader valve in the adapter the readings you'll get with that adapter are useless. The rubber o-ring rarely provides a good seal on the head either, most times they leak pretty bad. So your 150 PSI reading might be 20-50 PSI lower through that adapter, depending on its volume. If at all possible I generally leave the o-ring off and use a common spark plug gasket on the fitting and snug them down tight.
EDIT: Another problem with adapters is most of them are short... where you have a long reach spark plug hole they rarely fill half of that hole.
@misterclean59 clearly understands motors inside an' out. Excellent post an' brain candy... :-)
|04-27-2019 09:01 AM|
|misterclean59||On an old machine like this the needle can wear the taper to a smaller diameter which will cause a slight rich condition. You can replace it and it's holder/jet or lower the needle position with the clip. Leaning the fuel screw may help as well. As previously mentioned it looks like a rich condition and a little bit of oil too. A carb overhaul and new rings may be all that's needed if you catch it in time. Running with worn rings just wears the piston and cylinder at exponential rates.|
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