125-200cc 2011 WR165 finalized

[Radbuster]

So, after having this bike for the little more than a year, I think it is now pretty well sorted.

After trying different things this is how it now is configured:
WB165 kit
the special 200SX Fatty pipe
Lectron 36 with MS-3
13:47 gearing
WB exhaust port governor: extra silver inner spring.
5.4kg rear spring
one .40 and one .42 fork springs
Guts tall soft seat with Guts standard cover
Pro Taper CR-Hi bars
Moose racing brake lever wire (brake snake)
Rad braces and aluminum skid plate (can't remember make.)
CR 7.0 liter fuel tank any day now
BR8EG plug
Modded fork for nasty, slow conditions

Next is to go over to alkylate synthetic fuel (think weed-eater fuel) but keep 3% / 33:1 full synth oil.

I love to ride it for many reasons, now I only neet to learn how to ride it properly ;-)

Later, Fred

 

[Chef]

I've never heard of that fuel. I'm also curious why you would want the smaller tank. I found the small tank useless for trail riding and xc racing.

 

[Radbuster]

Hi,

Thanks to the Lectron and my wimpy riding, the CR tank should be good for about 3,5 hours of riding.
Regrettably it's hard to find adventure / long rides around here and races are rarely longer than 2,5 hours.
Normally I ride for about 2 engine hours so I should have about 3 liters to spare.
If otherwise I'll just put on the big tank as needed.

About the fuel, here is one supplier describing it:
http://www.aspenfuel.co.uk/products/environmental-fuels/aspen-alkylate-petrol/
It normally is quite expensive but a local gas station has it straight from the pump at about 15% more than regular gas, so I'm curious to try it.

The burn is super clean and leaves very little after it goes "bang". It is rated at 95 octane RON and is supposedly a drop-in application, but I'll first try a 50/50 mix and later 100% and see what happens.

/Fred

 

[flyingbob]

Why 50/50? Test it 100% so there is no variable to blame for a confusing result... Sounds interesting, more to learn!

 

[Radbuster]

Ok! All-in. 100% it is.
Hope I don't grab a nitro can by mistake in all the excitement ;-)

 

[Radbuster]

Something like that :-)

I have never tried race gas, but I can imagine that this is what it feels like on a 2-t.

Stronger, smoother, teeny bit of smoke at startup then nothing, just hot air from the silencer.
Stick your nose in the fuel tank and it barely smells anything.
Supposedly it also is storage-stable: just fire it up after half a year and it's supposedly all still there and ready to go.

I ran it for an hour on a technical sandy mx track where the sand is slightly heavy, gravelly and where you can stay on top, not the fluffy loose fine-grain type.
I still had some old gas in the carb and probably some spooge in the exhaust port, pipe and silencer, so I wanted to warm it up well and run it under a load for a good while before coming to any conclusions.
Before, when I had the 165 with MS-3 rod where I wanted it and running strong bottom to top with a steady idle, it smoked a bit and left a humid area around the silencer opening, but still no spooge drool.
Now, nothing, just hot air and a clean silencer!

It was easy to be on the gas and go way faster than the 125; a gear low for max power or a hear higher to go smoother.
The tall 13-47 gearing lets the little engine do it's magic. Trust it with this tall gearing and it really shows that it can pull.

I think a 250F in power is close, hard to say, but this has all the benefits of a 2-t: no engine braking, guilt-free revving, low noise, cheap, little risk of catastrophic failure, lightness, simplicity, etc.

This is now the little 300 that I allways wanted. Smooth, strong with just the max power I want, and not a 50hp top-end hook that throws you off like on a 250/300 2-t or 450 mx bike.

Now all excuses are used up and I only need to learn how to ride

 

[ajaxauto]

Wow My 165 which Walt himself personally did the the complet rebuild and shipped the motor back to me ready to race runs best with 13/52 If I want to get it in 6th wide open and still pulling that is the best gear ratio so far
for super super tight it is 12/52

Love the 165 BUT if all works out for next year it will be a super tricked out 2015 TE/TC 125 with every trick know to man to make this new Husky a open class bike beater . Get ready for a new project report

 

[Radbuster]

I'm mostly in 2nd-3rd-4th gear with steady throttle, trying to find grip and trying to get through really nasty sections and only see 6th during transport sections as an overdrive to lower the revs.
There are barely any elevation changes here, just small ups and downs and few fields and back around again.
The well-used enduro tracks are mostly a bed of rocks where the dirt has been splashed away.
Some guys really fly in this terrain but I'm not there yet .

 

[Radbuster]

1.87 liters / .5 gal per hour during race pace

Rode it in anger recently at race and averaged 24km/h / 15MPH for little more than 2 hours 15 mins.
It was a mixture of faster sandy section with whoops and a slower section of slippery dirt and rocks.
I topped off the small 7 liter mx tank to the max and prayed.
After the smoke had cleared I filled a quart at a time untill it was as full as before and that's how it ended up.
This is using the alkylate fuel mentioned above at 40:1 with the Lectron and MS3 rod set for a steady idle, which means it becomes on the rich side and smokes a little sometimes. The silencer did not drool but had some humid dark dirt around the opening.
Soo, the little mx tank is good for 3.5 hours at my wimpy race pace

It has been running fantastic and the weather has been very stable for a while but the temps have fallen quite fast during the last week, so we'll see how cold it can go before adjusting the rod. Last fall/winter/spring was a hassle to constantly readjust, but hopefully it was bad pump fuel with lots of ethanol.

Can the water in the ethanol lower the combustion temperatures signifficantly, and therefore particularly hurt 2-strokes? All pump gas over here seems to now have around 5% ethanol or more .

I love this half-a-300!