facebook1   youtube1   twitter1   instagram   linkedin1   pinterest1

logosmallNOTICE:  If you are not a free registered member of the site, you will not see the photos in the forum, and you won't be able to access our premium member content. Please consider joining our community!

yamaha lt2 100cc spitting oil from exhaust pipe

15 Jan 2020 11:33 15 Jan 2020 11:40 by matwom.
matwom
Sportsman
Sportsman
Posts: 104
More
Topic Author
yamaha lt2 100cc spitting oil from exhaust pipe #1
hi guys
i need abit of advice about my 1971 lt2 100cc , iv noticed when its running its spitting very small bits of oil from end of pipe {silencer end } and the higher i rev it the more it spits out .
iv had a vintage bike mechanic take a look and he says its 2 stroke oil and the pump is set in correctly . he took the bike away and he now says hes adjusted the oil pump but its still spitting oil so he thinks it needs a new oil pump . what do you guys think ? could he be correct or not ?
i found a new NOS pump but its 150 pounds so need to be sure this is the problem ?
should i just take the pump off and blank it and run it on pre mix ?
any help would be great , thank you

Please Log in or Create an account to join the conversation.

15 Jan 2020 14:53
FrankC
Solution Contributor
Solution Contributor
Posts: 1322
More
yamaha lt2 100cc spitting oil from exhaust pipe #2
If it were me I would disconnect the output line to the carb or manifold(not sure where it go on your model) let if feed to a jar, and run 32-1 in the fuel tank. Block the open port so it won't run lean. Just as a test to see if the oil dropplets or if you have excessive smoke goes away after a long hard ride. It could be also that you have a bad clutch side crank seal. If the spitting subsides DEET here on the forum rebuilds these like new. I have heard somewhere that as the pumps wear they.put out more.oil, could be wrong.
The following user(s) Liked this Post matwom

Please Log in or Create an account to join the conversation.

15 Jan 2020 15:32
1971DT250
Site Supporter
Site Supporter
Posts: 1028
More
yamaha lt2 100cc spitting oil from exhaust pipe #3
All of my Enduros from 100cc to 360cc spit oil out the exhaust. It's normal.

The hours spent riding my Enduros is not deducted from my life span.
The following user(s) Liked this Post matwom

Please Log in or Create an account to join the conversation.

15 Jan 2020 15:48
RT325
Collector
Collector
Posts: 5068
More
yamaha lt2 100cc spitting oil from exhaust pipe #4
It'll be purely that over 40 years the exhaust internal matting that stops the resonating sound through the side of the system is 'So' overloaded with oil from slow running that it'll smoke & drip forever unless yo give the system a good burn out. Trouble 'is' you possibly end up destroying the packing but can't have it both ways. I have in the past left my complete exhaust in our bonfire we had going at the time & it will never get cleaner that that lol. Performance increase was noticeable too because mine was restricted with carbon in important places in the baffle.
The following user(s) Liked this Post matwom

Please Log in or Create an account to join the conversation.

15 Jan 2020 17:37
Biknflyfisher
Open Class
Open Class
Posts: 297
More
yamaha lt2 100cc spitting oil from exhaust pipe #5
After my IT490 has sat for awhile, it will spit stuff out on the underside of the rear fender (mud guard as some call it) and on the rear wheel as well once I get it out and ride it hard (for a short time, then it clears up pretty well...)
Biknflyfisher

1983 IT490K; 2007 Yamaha FJR 1300,
2003 KTM 450exc
Too many fly rods,,,
The following user(s) Liked this Post matwom

Please Log in or Create an account to join the conversation.

15 Jan 2020 20:22
1971DT250
Site Supporter
Site Supporter
Posts: 1028
More
yamaha lt2 100cc spitting oil from exhaust pipe #6
After further thought I suspect its a mixture of unburned fuel and oil, carbon and condensation. My chainsaws do it a little and they run premix.

The hours spent riding my Enduros is not deducted from my life span.
The following user(s) Liked this Post matwom

Please Log in or Create an account to join the conversation.

16 Jan 2020 11:28
matwom
Sportsman
Sportsman
Posts: 104
More
Topic Author
yamaha lt2 100cc spitting oil from exhaust pipe #7
cheers for the advice guys , you lot are the best , thank you

Please Log in or Create an account to join the conversation.

16 Jan 2020 12:40
MarkT
Site Supporter
Site Supporter
Posts: 7747
More
yamaha lt2 100cc spitting oil from exhaust pipe #8
My guess is also simply old oil in the pipe...

I've also seen this happen if using modern synthetic high-end oil in the autolube... like something designed to mix lean like 50:1 or leaner... rather than old fashioned two stroke oil

On the pump it's very easy to check the output at idle and full throttle... which is what I'd do.

You just need a graduated container to measure the cc output when the primer wheel is rotated 200 times with pump cable at idle and then repeat the test at full throttle.

1963 YG1-T, 1965 MG1-T, Allstate 250, 1970 CT1b, 1971 R5, 1973 AT3MX, 1974 TS400L, 1975 RD350, 1976 DT175C, 1976 Husqvarna 250CR, 1981 DT175G, 1988 DT50, 1990 "Super" DT50, 1991 RT180, 2017 XT250
The following user(s) Liked this Post matwom

Please Log in or Create an account to join the conversation.

Moderators: yamadminEnduronutMakotosunDEETVinnieMini Enduro ManDevinJames Hart