[CRF150mom]

I'm looking for advice with the jetting of my son's 2007 Honda CRF 150R. Any suggestion on what size jetting is needed for improved performance? It's currently stock. Thank You

[Asmith]

The stock needle is on the 3rd clip. Stock pilot is a 40. Stock main is a 135.

The cure for the hard start is both jetting and procedure.

Change the set up to:

138 main, 45 pilot, 40 leak jet, o-ring on AP linkage, grind rivet flush, fuel screw at 2 turns out.

Use this starting procedure: fuel on, choke on, 3 good twists of throttle,
1 or 2 kicks it will fire up.

[CRF150mom]

The stock needle is on the 3rd clip. Stock pilot is a 40. Stock main is a 135.

The cure for the hard start is both jetting and procedure.

Change the set up to:

138 main, 45 pilot, 40 leak jet, o-ring on AP linkage, grind rivet flush, fuel screw at 2 turns out.

Use this starting procedure: fuel on, choke on, 3 good twists of throttle,
1 or 2 kicks it will fire up.

Thank you for the advice ~. I guess I shouldv'e looked around more as I did find other threads relating to this topic. I am hoping this will help the flattening out problem, meaning it just seems to lose power quickly in each gear. If that makes any sense. I really appreciate your advice. Hope to do this tomorrow. We don't have too much of a problem with starting, on occasion when it is warm though. Thanks again, any other advice on modifications you know of would be great!

[Collin]

This is great info, but what is the rivet grind thing all about?

[Zanardi4]

The stock needle is on the 3rd clip. Stock pilot is a 40. Stock main is a 135.

The cure for the hard start is both jetting and procedure.

Change the set up to:

138 main, 45 pilot, 40 leak jet, o-ring on AP linkage, grind rivet flush, fuel screw at 2 turns out.

Use this starting procedure: fuel on, choke on, 3 good twists of throttle,
1 or 2 kicks it will fire up.

Agent,

Would this also be the setup for Cal City/Randsburg? (2600 - 3000 ft alt)


Thanks Paul!

Joe V

[amaviper]

This is great info, but what is the rivet grind thing all about?

Red Beards AP mod. Rivet is on the diaphram. Look on page 14 of below link.

http://www.squadpage.com/pandora/Professor%20RedBeard450%20How-To%20AP%20Mod.pdf

[Asmith]

The stock needle is on the 3rd clip. Stock pilot is a 40. Stock main is a 135.

The cure for the hard start is both jetting and procedure.

Change the set up to:

138 main, 45 pilot, 40 leak jet, o-ring on AP linkage, grind rivet flush, fuel screw at 2 turns out.

Use this starting procedure: fuel on, choke on, 3 good twists of throttle,
1 or 2 kicks it will fire up.

Yup. It'll work perfect up there.

Agent,

Would this also be the setup for Cal City/Randsburg? (2600 - 3000 ft alt)


Thanks Paul!

Joe V

[Zanardi4]

The stock needle is on the 3rd clip. Stock pilot is a 40. Stock main is a 135.

The cure for the hard start is both jetting and procedure.

Change the set up to:

138 main, 45 pilot, 40 leak jet, o-ring on AP linkage, grind rivet flush, fuel screw at 2 turns out.

Use this starting procedure: fuel on, choke on, 3 good twists of throttle,
1 or 2 kicks it will fire up.

Thanks Paul!
Yup. It'll work perfect up there.

Agent,

Would this also be the setup for Cal City/Randsburg? (2600 - 3000 ft alt)



Joe V

Thanks Paul!