Forced induction 100cc

**Sketchy_Racer** · 4th January 2015, 19:08

Attached is my current cam profile in relation to a stock CRF100. I'm thinking of going the whole hog and setting it up as per the aussies 27.5hp cam.

**F5 Dave** · 4th January 2015, 19:23

Don't be silly. Discretion is the better part of valour.

Take their specs and add a mm. Can't have the Aussies showing us up.

**Flettner** · 4th January 2015, 20:07

Speedpro, have you got the other half of your Yamaha FZR head? is it useable, I've got a supercharger on the way!
I think I had a spare FZR head down at the storage cowshed, birds might have turned it back to boxite.

**speedpro** · 4th January 2015, 20:30

I think I have a complete late model head. Will check tomorrow.

**Sketchy_Racer** · 4th January 2015, 20:31

Originally Posted by Flettner

Speedpro, have you got the other half of your Yamaha FZR head? is it useable, I've got a supercharger on the way!
I think I had a spare FZR head down at the storage cowshed, birds might have turned it back to boxite.

Damn, I was wondering how long it would take until you would start a boosted bike and make me look silly

Did you get one through the Ozzy guys?

**Sketchy_Racer** · 5th January 2015, 08:15

So hunting around trademe has been unsuccessful in finding a suitable carb. I'm after a 30mm+ CV carb if anyone has one or knows where I can get one. Needs to be in good condition preferably. The one I am using at the moment sat outside for a few years by the looks and just doesn't want to know about it.

**Grumph** · 5th January 2015, 08:58

Use a car carb. Small SU or even a single choke downdraft Weber or Dellorto. There are very few aftermarket needle options available for bike CV's whereas the car carbs are pretty well infinitely adjustable.

**speights_bud** · 5th January 2015, 08:59

Originally Posted by Sketchy_Racer

So hunting around trademe has been unsuccessful in finding a suitable carb. I'm after a 30mm+ CV carb if anyone has one or knows where I can get one. Needs to be in good condition preferably. The one I am using at the moment sat outside for a few years by the looks and just doesn't want to know about it.

Might have something, cv carb off an xt250/225

**husaberg** · 5th January 2015, 16:12

Originally Posted by Sketchy_Racer

So hunting around trademe has been unsuccessful in finding a suitable carb. I'm after a 30mm+ CV carb if anyone has one or knows where I can get one. Needs to be in good condition preferably. The one I am using at the moment sat outside for a few years by the looks and just doesn't want to know about it.

Hey Glen might pay to undersize the carb 26mm would likely be ample, otherwise you will lose some velocity enriching effect. I am no expert but I have read it a few times...
scooter carbs are around that size....

**Flettner** · 5th January 2015, 20:05

Originally Posted by Sketchy_Racer

Damn, I was wondering how long it would take until you would start a boosted bike and make me look silly

Did you get one through the Ozzy guys?

Thank you Sketchy, you have inspired me to get stuck in ( well collect parts anyway ) and have another go. I feel I have some unfinished business. You know what it's like, not like I haven't got enough projects.
Nah, got one through "some guy" down south.

**Sketchy_Racer** · 5th January 2015, 20:15

Originally Posted by husaberg

Hey Glen might pay to undersize the carb 26mm would likely be ample, otherwise you will lose some velocity enriching effect. I am no expert but I have read it a few times...
scooter carbs are around that size....

Hmmm this is quite a good point. As the flow through the carb at the supercharger entry will be constant (or close to it) whereas in a normal configuration it would be getting a big pulse every 4th stroke.

Originally Posted by Flettner

Thank you Sketchy, you have inspired me to get stuck in ( well collect parts anyway ) and have another go. I feel I have some unfinished business. You know what it's like, not like I haven't got enough projects.
Nah, got one through "some guy" down south.

Glad my mucking around was enough to spark the interest for ya. Looking forward to seeing how you get on if your two stroke development work is anything to go by!

**speedpro** · 7th January 2015, 17:19

Found the smog pump, photos attached. Glen it's yours as long as you use it. I also have a scooter carb somewhere off my Yam 125, CV type & electric choke. Will dig it out and check size.

**mr bucketracer** · 7th January 2015, 17:29

Originally Posted by speedpro

Found the smog pump, photos attached. Glen it's yours as long as you use it. I also have a scooter carb somewhere off my Yam 125, CV type & electric choke. Will dig it out and check size.

if glen does not want it i will be very happy to take it off you (-: