stopdropanroll
TY 4 Stroke Master
Re: The great wheel debacle...
NICEMotoPsycho said:I got a great set of OEM Yammi wheels the other day. I did a 2 wheel conversion on the rear, and the wheels fit, and look, B-E-A-YOU-TEEFULL. They looked so nice, I thought I'd buy a set to replace the upper idlers as well... That's where the problem started.
The idlers use a different bearing than the rear axle. The new wheels will not accept the stock idler bearing. They will however, accept a stock bogey bearing... with a bit of work at the machine shop, and the nightmare associated with cutting the bearing out of a bogey wheel, I got them installed.
You can use the smaller "bogey" version of this OEM billet wheel at the idler wheel location, but that requires the use of 8" wheels on the rear axle so the track will clear the rear shock on a timbersled rear end. Problem here is, Yammi only makes the wheels in the small bogey size
(5.5" I think) and the stock 7" for the rear axle.
Anyway, for the price, I still came out ok including the machining cost.
[/b]
Adjusting CO's
I came across this in a write-up on a superbike site. It makes more sense to me than the idea of each CO # being for each cylinder. I have an '08 Grizzly, that only displays CO1. After I made adjustments, I only noticed a bottom end change. I will be testing this theory on the nytro this year.
I believe they would omit the C4 on sleds to prevent a potential WOT meltdown - much as they do when undergearing to prevent overreving (all sled mfg's do it by at least 1 tooth!)
(These instructions are for a 2004 YZF-R6)
A: Fuel injection Adjustment
Fuel injection amount can be adjusted in the following four ranges:
Code C1: Fuel amount injected at 25% or less of throttle opening and at 3000 rpm or less
of engine speed
Code C2: Fuel amount injected at 25% or less of throttle opening and at 3000 rpm or
more of engine speed
Code C3: Fuel amount injected at 25% to 90% of throttle opening
Code C4: Fuel amount injected at 90% or more of throttle opening
Before changing the settings, check the engine for its characteristics in normal condition.
It is recommended that the settings be checked with an A/F measuring instrument.
Guidelines for setting:
• Code C1: At 25% or less of throttle opening and at 3000 rpm or less of engine speed:
This affects the idling stability and the feeling experienced during races.
Too rich an air-fuel mixture may foul the spark plugs.
• Code C2: At 25% or less of throttle opening and at 3000 rpm or more of engine
speed:
This affects the feeling experienced during engine braking and at initial
throttle opening.
Make a change of 2 to 5% at a time while checking for any resulting
changes.
• Code C3: At 25% to 90% of throttle opening:
This affects the feeling experienced at half throttle opening.
Make a change of 2 to 5% at a time and check for any resulting changes.
• Code C4: At 90% or more of throttle opening:
This affects the feeling experienced at full throttle.
Adjustment to too lean a mixture will lead to engine breakdown.
Adjustment by checking the A/F is recommended.
In particular, to adjust on the leaner side, make a change of 1 to 2% at a
time while checking for the result. 12 to 13 is a targeted A/F.
I came across this in a write-up on a superbike site. It makes more sense to me than the idea of each CO # being for each cylinder. I have an '08 Grizzly, that only displays CO1. After I made adjustments, I only noticed a bottom end change. I will be testing this theory on the nytro this year.
I believe they would omit the C4 on sleds to prevent a potential WOT meltdown - much as they do when undergearing to prevent overreving (all sled mfg's do it by at least 1 tooth!)
(These instructions are for a 2004 YZF-R6)
A: Fuel injection Adjustment
Fuel injection amount can be adjusted in the following four ranges:
Code C1: Fuel amount injected at 25% or less of throttle opening and at 3000 rpm or less
of engine speed
Code C2: Fuel amount injected at 25% or less of throttle opening and at 3000 rpm or
more of engine speed
Code C3: Fuel amount injected at 25% to 90% of throttle opening
Code C4: Fuel amount injected at 90% or more of throttle opening
Before changing the settings, check the engine for its characteristics in normal condition.
It is recommended that the settings be checked with an A/F measuring instrument.
Guidelines for setting:
• Code C1: At 25% or less of throttle opening and at 3000 rpm or less of engine speed:
This affects the idling stability and the feeling experienced during races.
Too rich an air-fuel mixture may foul the spark plugs.
• Code C2: At 25% or less of throttle opening and at 3000 rpm or more of engine
speed:
This affects the feeling experienced during engine braking and at initial
throttle opening.
Make a change of 2 to 5% at a time while checking for any resulting
changes.
• Code C3: At 25% to 90% of throttle opening:
This affects the feeling experienced at half throttle opening.
Make a change of 2 to 5% at a time and check for any resulting changes.
• Code C4: At 90% or more of throttle opening:
This affects the feeling experienced at full throttle.
Adjustment to too lean a mixture will lead to engine breakdown.
Adjustment by checking the A/F is recommended.
In particular, to adjust on the leaner side, make a change of 1 to 2% at a
time while checking for the result. 12 to 13 is a targeted A/F.
Under Tunnel Exhaust
Figured I'd try the under tunnel thing. The kicked up tunnel extension really helped with space...
Figured I'd try the under tunnel thing. The kicked up tunnel extension really helped with space...
That's some very cool stuff. Nice job!
woodsrider
TY 4 Stroke Junkie
- Joined
- Feb 17, 2005
- Messages
- 669
- Location
- Lewiston, ID
- Country
- USA
- Snowmobile
- 2017 YZ450FX1 Moto-Trax 137 Mountain Kit
what keeps your silencer from pushing up against the top of the tunnel. You shoouldn't haveany problems from snow running it that far back.
sledskiing
Expert
woodsrider said:
looks like it's riveted underneath. hard to tell
If you notice, the rear hanger is riveted to the can. These rivets were originally just to hold the endcap of the can in.
stopdropanroll
TY 4 Stroke Master
Nice work, keep the pics coming! 
Polish job is coming along...
Don't ever start this... it never ends
Don't ever start this... it never ends
fxnytrortx3
Expert
omg you could start selling mirrors haha. what kind of polish did/do you use.
thanks
darren
thanks
darren
Mothers.
bcmountain
Newbie
- Joined
- Dec 21, 2007
- Messages
- 19
when r u coming to my house your sled looks sweet i'am going to do and undertunnel exhaust like u have it with a mountain mod seat or make a custom cooker under the seat.
It leaves a great place for a hotdogger!
fxnytrortx3
Expert
MotoPsycho said:
cool thanks
darren
mothers, and a Mothers powerball will do wonders!!!!
Have not done it on the yammie yet, but my Rev practically glowed...dont forget to put some sort of sealant on top of it though, mothers is just a polish...it will oxidize quickly without some form of sealer...the best made is a product called SharkSkin...but it is SPENDY, but worth it!!!
Have not done it on the yammie yet, but my Rev practically glowed...dont forget to put some sort of sealant on top of it though, mothers is just a polish...it will oxidize quickly without some form of sealer...the best made is a product called SharkSkin...but it is SPENDY, but worth it!!!
