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Engine flushing ??

chuck hahn

Forum LongTimer
Past Site Supporter
Was just wondering if it was practical to do an engine flush to engines that have set for a while.. I got the new project fired up the other day for about ten minutes. I dont know how long it has been since it had been started either. Anyways i was thinking do an oil change and maybe run that for 100 miles or so then do another one. Then my buddy Scot asked what the guys on he forum thought of some kinda additive to cleanse the engine but wouldnt hurt the clutch plates?? Said i didnt know but i would ask, so the question has been asked. Any thoughts??
 
UHMMMMM I guess i should remember the search feature. I did just after i hit the submit button..now to just figure out what will be the best and safest product to do the flush with!!!
 
I'm not a fan of engine solvent sauce since it's hard to get it all out of the engine. My recommendation is to put your engine on a 1000 mile oil change interval for a couple of changes using a good quality diesel engine oil, which has lots of detergent.
 
I'm not a fan of engine solvent sauce since it's hard to get it all out of the engine. My recommendation is to put your engine on a 1000 mile oil change interval for a couple of changes using a good quality diesel engine oil, which has lots of detergent.

Amen. Dittos. Likewise. What he said. :D


PLEASE, everyone -- DON'T dump mouse milk into your GS engine. Just feed it any decent engine oil and change it every 2,000 miles like it says in the manual.
 
Ive used seafoam in my crank case and it did nothing to the clutch at all. Actually seemed to grab better afterwards.
 
Ive used seafoam in my crank case and it did nothing to the clutch at all. Actually seemed to grab better afterwards.

The times I have done it, I waited until I was due for a change, put seafoam in there, rode about 50 miles, then come home and dumped the oil.

Dropping the pan and cleaning the screen is a good idea if it's never been done. I dropped the pan on my G after my rebuild and the screen had some portions gummed up, and there were various crusties in the bottom of the pan.
 
Even when you change the oil there is still a fair bit of oil remaining inside the engine in various pockets, cavities, oil lines, ect. When you dump your new oil in it will mix with this diluted old oil thus diluting the new oil to some extent. For those that insist on doing this you might want to consider adding a couple of quarts of 20W-50 oil to go along with the normal 10W-40 or 15W/40, since the dilution will lower the viscosity of the oil being used.
 
Thanks guys for the info. I do have a can of seafoam in the cupboard in the garage. How much should i add to the crankcase? I think a combination of the seafoam And dropping the pan and cleaning the screen is a good combo.. cetainly all the things you can do to help is a benefit in my opinion.
 
Thanks guys for the info. I do have a can of seafoam in the cupboard in the garage. How much should i add to the crankcase? I think a combination of the seafoam And dropping the pan and cleaning the screen is a good combo.. cetainly all the things you can do to help is a benefit in my opinion.

You can lead a horse to water but you can't make it drink.:(
 
good thing i dont have a horse//just a scooter i am trying to do the best for. So how much seafoam??
 
Clean out the oil pan and sump screen.
Install new pan gasket.
Change the oil and filter every 500 miles until you feel good about things.
The filter and screen will remove any large pieces floating around in your engine.

Do what you're going to do but the above is good and sound advice.
 
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