Oxygenated fuel, jetting & oil ratio question.

[gotdirt]

Hi I just installed a V-Force reed block on my 2001 2.9 (recently purchased the bike second hand). The old reed stock reed block had Boysens in it, the smaller petals were slightly stuck open. While I had the carb off I blew out all of the jets and checked the sizes. The bikes starts muck better now.

The main is a 135 and the pilot is a 43. Searching the forums about jetting these seems quite large. Has anyone used this size jets to compensate for 10% alcohol required in pump gas? I am planning on running 80:1 oil ratio. Until I can get some smaller jets I could drop the ratio down to 50:1 or so to lean it out a bit.

We just had an ice storm and 10 inches of snow so riding it for testing is not an option. I am leaving for North Carolina on Thursday to do the Ryan school and would like to try and have it set up as good as possible. I have not yet had a chance to ride the bike since I purchased it and can not comment on how it performed before I serviced it.

Thanks,

Bill

[copemech]

Hi I just installed a V-Force reed block on my 2001 2.9 (recently purchased the bike second hand). The old reed stock reed block had Boysens in it, the smaller petals were slightly stuck open. While I had the carb off I blew out all of the jets and checked the sizes. The bikes starts muck better now.

The main is a 135 and the pilot is a 43. Searching the forums about jetting these seems quite large. Has anyone used this size jets to compensate for 10% alcohol required in pump gas? I am planning on running 80:1 oil ratio. Until I can get some smaller jets I could drop the ratio down to 50:1 or so to lean it out a bit.

We just had an ice storm and 10 inches of snow so riding it for testing is not an option. I am leaving for North Carolina on Thursday to do the Ryan school and would like to try and have it set up as good as possible. I have not yet had a chance to ride the bike since I purchased it and can not comment on how it performed before I serviced it.

Thanks,

Bill

This jetting sounds a bit odd for a stock Dellorto, reguardless the reeds. Should be close to 36/118 i would think. Out of box setting for the Kiehin would be 45/125 so a 43 pilot will work, yet the main sounds a bit rich.

I would leave the oil at 80:1

Edited February 22, 2011 by copemech

[gotdirt]

Thanks for the reply COPEMECH. I am going to let it be till I can order up some jets and will use premium with ethanol at 80:1

The Ryan Young school this weekend will be my first ride on a trials bike in 30 years. From what I have read on the 2.9 it is probably a good thing that the jetting is a bit on the rich side to soften up the power. I will post an update on how it ran when I get back from North Carolina.

Bill

[copemech]

Thanks for the reply COPEMECH. I am going to let it be till I can order up some jets and will use premium with ethanol at 80:1

The Ryan Young school this weekend will be my first ride on a trials bike in 30 years. From what I have read on the 2.9 it is probably a good thing that the jetting is a bit on the rich side to soften up the power. I will post an update on how it ran when I get back from North Carolina.

Bill

If you call ryan he will bring what you need!!!!

[gotdirt]

Back from North Carolina and the bike worked fine. It did seem to be a bit rich but never had any problem with stalling or stumbling. All of my riding was at about 5 to 30 percent throttle. My friend has an older Gas-Gas which she uses a 70:1 fuel mixture (blend of premium ethanol free and race gas) and I used her fuel.

I plan on doing some jetting this summer and will try to remember posting an update with the results. I plan on using 80:1 when I start messing with the jetting.

Bill