Need help from the 2 smokers

**green machine** · 17th January 2009, 20:00

My mate ditched his WR250 for a YZ250(brand new).... and just rang me pissed off cause his bike gave him grief today(plug kept fouling)he's running 32:1 as per manual with that high octane Shell petrol.
Can any off you 2 stroke gurus offer any tips as per fuel mixture,air/fuel screw setting etc or any thing you might think basic but would be helpful to a 2 stroke virgin.......for the record he loves the bike(especially in the bush)but he was muttering that he should have stayed with a four stroke............hahaha

**telliman** · 17th January 2009, 20:04

bet you he's running yamalube oil, have heard nothing good abt that oil, always fouling plugs!

**Rupe** · 17th January 2009, 20:08

when it's talked about having a lean or rich 2stroke, its not the amount of oil you put in. It is the fuel and air mixture, so if you added more oil there would be less fuel making it a leaner mixture in effect. Having said that you should run a good fully synth oil at yamaha's recomended ratio as this is unlikley the problem.

He needs to try to work out where the enginge is bogging or feeling thick and make an adjustment there and go from there. It could also just be the air screw.

He also might need to run a gear lower and let it rev a bit more.

For a more infored answer Reckless really knows his stuff

**charles23** · 17th January 2009, 20:24

bummer he didn't even get out of 1st gear...........missed out on a good ride, JAM Track rocks.

**B0000M** · 17th January 2009, 20:53

40:1 is a good ratio, never had any problems at this ratio. dont know the yammmy specifics for jetting tho

**green machine** · 17th January 2009, 21:08

Originally Posted by telliman

bet you he's running yamalube oil, have heard nothing good abt that oil, always fouling plugs!

yeah he is.....i suggested a change of oil as i have another mate who was running Slkoline and 95 and kept fouling plugs.....changed to Motul 800 and 98 and hasn't had a problem since

**FROSTY:Me** · 17th January 2009, 21:43

Id suggest he basicly needs to clear its throat a bit. and hey Im running yamalube with NO issues at all

**barty5** · 17th January 2009, 21:47

Originally Posted by charles23

bummer he didn't even get out of 1st gear...........missed out on a good ride, JAM Track rocks.

Off topic what this track like these days years since i have been there??

**B0000M** · 17th January 2009, 21:56

i suggest castrol tts, available anywhere -eg repco or supercheap or most bike places, cheap, reliable (15 years worth with no issues) and never a foulded plug

**jt119** · 18th January 2009, 00:07

were is the jam track

**vr4king** · 18th January 2009, 06:47

Originally Posted by B0000M

i suggest castrol tts, available anywhere -eg repco or supercheap or most bike places, cheap, reliable (15 years worth with no issues) and never a foulded plug

2ND that...........Have they recently changed its packaging i went to supercheap and bout some but was in a gold bottle?

**Dent** · 18th January 2009, 07:16

Just re-read your original post. He just purchased it brand new right?

Well jetting out of the box, float levels etc are often not perfect on a new bike. I had my gasgas rejetted by the local expert after one day of running it in. I also had the float level adjusted, so it didnt piss fuel out the overflow when on the sidestand - yes it was that bad.

I would suggest he talk to the dealer, specifically the mechanic at the dealer who has the most experience with that model and jetting them right.
Or, ask on here about where to take it to get it jetted. DIY jetting on a brand new bike may not be his cup of tea.
As people have already said, the jetting must be right for the oil type and ratio used.

Also, whats the deal with needing, or thinking you need 98 on a low(ish) compression 2 stroke? Possibly a topic for another thread.

**scott411** · 18th January 2009, 07:46

the Yamaha dealer should have had a base jetting spec if they were bad from new, some models are, and sometimes it depends on what market spec we get in this country, (euro spec tend to be a lot richer),

**t3mp0r4ry nzr** · 18th January 2009, 07:58

agreed that yamalube is a`shit as its name suggests! but if he's having consistant issues with fouling, then look at riding techique if the jetting is close. maybe try leaning the pilot screw a lil