Teds on to it don't chop and changeMotul 800 at 40:1
Personally Motul 800 (a 50.1 Oil) but I run at 32.1
40 to 1 on Motul is chancing your luck,
I would not recommend any leaner than 30 to 1 with a 125cc screamer,
sorry Son
I disagree, more oil means hotter running as there is less fuel per charge. im running 80:1 and up to 100: 1 in a husky 400 and its been great, jetted nice and lean, it runs as smooth as a baby's bum down low, pulls off the bottom like the Scottish flyer and revs like a 125b (no thanks to ol mate with the porting tool!!) so I would use a full synthetic at 40:1 and ease out to 50:1 I use motorex...) no splooging, easy starting and cooler running.....
its a constant argument but im happy using less of a very high quality oil (2 years and so far so good) also runs my whipper snipper, blower vac, chain saw and Kato 300 (4 years and no drama)
Just seized my 83 YZ125 last weekend, after replacing the cylinder & piston last July, as piston nipped up then. NEVER using MOTUL 800 again. Have always been mixing at 32:1 and has always been hard to start, if not started after sitting for more than a week. ( Even with fresh fuel mix ). Usually have to take the bowl off the carby, take out the pilot jet, clear the blockage from the fuel/oil, then it will start.I've been using Motul 800 at 40:1 in my vintage race bikes for 10 years with none of the problems you've had and I worked in the Husqvarna race team for several years where we used Motul 800 at 40:1 in the National race bikes with never a problem..
Took the cylinder & piston to get rebored and old mate gave me some good info. Motul oil at 32:1 is not lubricating my cylinder, the inside of my piston is dry but should have an oily film coating it. Take mixture back to 25:1 and re-jet to suit, motor should have more power, run cooler and last longer as well. (Going by his years of engine rebuilding knowledge)
Sure the modern oils say can be used at 32:1, 50:1 or higher, but the fine print also says to Refer to the Vehicle Manufacturers Recommendations.
ive yet to see a oil related seize, there is always a mechanical reason...generally an air leak causing a hot spot or poor jetting in the midrange.Yep or even an ignition problem. Oils are very good these days, we're not back in the 70's
I would not run the 8 or the 940 to 1 on Motul is chancing your luck,
I would not recommend any leaner than 30 to 1 with a 125cc screamer,
sorry Son
Exactly.
Ken, if you can hold this thing pinned everywhere, go to a 9 plug as well. If you can't use a 8
I would not run the 8 or the 940 to 1 on Motul is chancing your luck,
I would not recommend any leaner than 30 to 1 with a 125cc screamer,
sorry Son
Exactly.
Ken, if you can hold this thing pinned everywhere, go to a 9 plug as well. If you can't use a 8
I would run the 85
I keep them in stock
ive yet to see a oil related seize, there is always a mechanical reason...generally an air leak causing a hot spot or poor jetting in the midrange.
Thats what is so good about this forum! A wealth of knowledge from members to help solve issues with our bikes. Thanks to JohnnyOive yet to see a oil related seize, there is always a mechanical reason...generally an air leak causing a hot spot or poor jetting in the midrange.Yep or even an ignition problem. Oils are very good these days, we're not back in the 70's
Just seized my 83 YZ125 last weekend, after replacing the cylinder & piston last July, as piston nipped up then. NEVER using MOTUL 800 again. Have always been mixing at 32:1 and has always been hard to start, if not started after sitting for more than a week. ( Even with fresh fuel mix ). Usually have to take the bowl off the carby, take out the pilot jet, clear the blockage from the fuel/oil, then it will start.if you really think the oil was at fault contact Link International the OZ Motul Distributor with your concerns, you might be surprised with their diagnosis.
Took the cylinder & piston to get rebored and old mate gave me some good info. Motul oil at 32:1 is not lubricating my cylinder, the inside of my piston is dry but should have an oily film coating it. Take mixture back to 25:1 and re-jet to suit, motor should have more power, run cooler and last longer as well. (Going by his years of engine rebuilding knowledge)
Sure the modern oils say can be used at 32:1, 50:1 or higher, but the fine print also says to Refer to the Vehicle Manufacturers Recommendations.Just seized my 83 YZ125 last weekend, after replacing the cylinder & piston last July, as piston nipped up then. NEVER using MOTUL 800 again. Have always been mixing at 32:1 and has always been hard to start, if not started after sitting for more than a week. ( Even with fresh fuel mix ). Usually have to take the bowl off the carby, take out the pilot jet, clear the blockage from the fuel/oil, then it will start.I've been using Motul 800 at 40:1 in my vintage race bikes for 10 years with none of the problems you've had and I worked in the Husqvarna race team for several years where we used Motul 800 at 40:1 in the National race bikes with never a problem..
Took the cylinder & piston to get rebored and old mate gave me some good info. Motul oil at 32:1 is not lubricating my cylinder, the inside of my piston is dry but should have an oily film coating it. Take mixture back to 25:1 and re-jet to suit, motor should have more power, run cooler and last longer as well. (Going by his years of engine rebuilding knowledge)
Sure the modern oils say can be used at 32:1, 50:1 or higher, but the fine print also says to Refer to the Vehicle Manufacturers Recommendations.
You've got other issues.. It's not the oil.
ive yet to see a oil related seize, there is always a mechanical reason...generally an air leak causing a hot spot or poor jetting in the midrange.Thats what is so good about this forum! A wealth of knowledge from members to help solve issues with our bikes. Thanks to JohnnyOive yet to see a oil related seize, there is always a mechanical reason...generally an air leak causing a hot spot or poor jetting in the midrange.Yep or even an ignition problem. Oils are very good these days, we're not back in the 70's
and John Cahill for the info.
You still have to be carefull of the information provided
I was a member for years without posting anything
But I had to correct some crap written by someone who didn't know what they were talking about
I have been a Suzuki dealer for over 30 years,
In my last Dirttrack TM125 I ran it with a 10 plug because that was the heat range that the compression / timing required just to keep 6 speed Elsinores in sight.
Just for fun I will repeat myself RM125 Aircooled on VMX Motul 800 at 40:1 with a NGK B85EGV plug with standard timing.
That is good to know.At the Mr VMX Dean Burt fouled his plug at the pit gate,
I definitely want my spares kit to have some in amongst the eights and nines.
I will be around to get a few tomorrow.
Young hired guns, here we goSorry Ted wasn't even thinking of you
Have you ridden over 30 VMX meetings in the last 4 years.
No. Didnt think so.
Political correctness or blatant snipe....you think what you wantTed last weekend at Easter Creek there were 3 kids on Yamaha R15s that I assisted massively,
Too much oil can result in seizure as well. The unburnt oil glazes up the ring landings and piston walls, causing premature wear. Personally, I have all my 2 smokers (including whipper snipper) on Motul 800 at 40:1 for years, and I have never had a seizure. I ran my 74 Elsinore at 40:1 and the piston and rings lasted 2 entire seasons without any signs of scuffing. Shite, my whipper snipper is at least 10 years old and it revs to the moon and back without any dramas so I don't see why a 125 would require more oil than any other 2 stroke.Unburnt oil is from improper jetting and ignition, if your Elsinore had 50hp at the wheel you would have an entirely different story to tell. Whippersnippers have no load to speak of on the engine. Go to a local kart track and listen to a ICGP kart hitting 18,000 rpm and you will understand why some engine need more oil
Plug is B85EGV
That is good to know.At the Mr VMX Dean Burt fouled his plug at the pit gate,
I definitely want my spares kit to have some in amongst the eights and nines.
I will be around to get a few tomorrow.
I pulled an 85 from Beetles or Gilesys tool box,
I didn't ask Dean if he noticed a difference in his RM400, but it did run sweet,
It just makes sense,
8's range between 7 & 9
9's range between 8 & 10
85's range between 7.5 & 9.5
Just where Air cooled VMXers live
Your G looks good, same as my previous post if you can ride the bike like it was designed run a 9, the S is OK but the 9EG or 9EGV is better,For Dirttrack and high revs run a 10
If the engine is fairly fresh and ridden regularly run the good oils at 40:1.
If its not so fresh run synthetically fortified oil at 32:1
If you run mineral oil run it at 20:1 as was recommended.
If you don't have X ray vision I suggest some plug chops at quarter, half and full throttle
NGK have Racing on the box;D a proper race plug is a platinum/iridium NGK R7282 standard fitment RS/ TZ 125 and 250( some kx250/125). They add 0.5-1hp across the range on a 85cc
They are a dearer plug, not from the standard range
Interesting Lozza,
What can happen if the bike has no resistor in the plug or in the cap?
You guys are living in the past with your 20:1 and mineral oils. Your Suzuki manual that recommends 20:1 was printed in 1977 based on the oils that were available back then.
Modern oils have improved out of sight since 1977 and today's bikes make a lot more horsepower and rev a lot harder and the manufacturers use and recommend 40 or 50:1 and there are far less engine failures today using that mix than back in the day.
1981 Maico 490 manual recommends;
special high Quality oil mixture,
1;20 with 2 stroke oil
1;50 with Bel Ray MC1
1;100 with Maico MC-GP-100 Mix oil
and cautions never to mix Mineral and Synthetical oils.
Keep in mind a 490 does not rev as high as a 125cc
Maico oil must have been special stuff taken from either whales or vestal virgins.
FYI; We always ran HRC NSR500 on Castrol A747 at 28 to 1 , that was the safe limit;Dave I thought it was 32:1 at HRC
You may get away with leaner oil mixs , But if you are recommending from a reliability point of view that will cover all situations.