It is usually more noticable on the machines with 2 cycle engines.

Farmr

 

i remember that same situation with my snowmobile...i asked a fella about it and he told me that the cold engine is tighter and holds a higher compression and therefore will have more power when cold....BUT he told me i should never run the engine hard at all until it is warm...makes sense to me but what do i know!!

 

You could also be running lean. With a cold engine, the choke is engaged and would run richer (or closer to mormal) till the engine gets warm. Just a thought.

Cold air is also more dense and can increase compression. I have a friend with a dragster (Dodge Dart of all things) and he typically runs a faster quarter mile on a cold day; however, that's the ambient air temperature and not the operating temperature of the engine. The air at the intake/carb has to be cold to begin with, and that's why so many rice rockets use cold air intakes, RAM air intakes, or intercoolers on turbochargers... but I'm starting to get off the subject...

 

let me say this:check it out soon you're next riding trip,run yours modded scrambler for about 25-30 min stop cooling engine 10-15 min and restart depending the weather the motor will scream a lot more and pull the first couples min when restarted...

 

and so you CAN'T burn down the engine is already at peak temp...

 

My idea is that the clutch generates alot of heat after
it has run for awhile. Just touch the housing after its
been run for 30 minutes. The only air is generated by
the rotation of the clutches. In one way and out the
other. So if I can figure out a way to get more air
into the housing then maybe I could regain some of that
lost power!
I'm waiting for my brother to get a temp gauge so we
can see if there is much difference with a fan installed.
Just by touch it feels cooler compared to my stock TBs
clutch housing.

 

I have another ? does anybody elses TB do this? When i first start mine when its real cold out i have to use the choke to get it started but as sone as it starts i have to turn the choke off or it will not run at all. Is this normal or not. Thanks for any help.

 

Yep that is what mine does. The choke will only work for about 10 seconds.

 

yes that all in the clutchs dudes,if you think about it for a while a full modded 2 stroke scrambler 400 with 45-50% more power to the rear wheel cauz of clutching inefective some other mamufacturer sport models would look like nothing...

 

When using the choke on a 2 stroke you should turn off the choke as soon as it starts. This keeps from fouling the plug. Of course its not going to idle until warm. I dont have to use the choke on my sons TrailBoss. I can sit for a whole week and fire right up with out the choke.