Birdman's Prebug

[birdman]

Also, since I had grenading gears and I've been having issues with it running hot, I decided to pull the motor and do some checks I've never done before. I initially just slapped this thing together and sent it, never checked squish or anything. So I decided to try and do this right. I checked squish and it's 1.37mm, I know 0.7-1.0 is optimal but would this much squish contribute to it to run hot? I thought tight squish clearance would cause it to run hot? I also leak checked it at about 6psi and it held for 10+ mins without dropping at all, so that's all good. So!! What do you all think of this squish?

[yambw’s]

That’s such a shame mate, makes me want to go check my gear cover 😳

[Zino]

That squish is ok Alot of sport kits out of the box are 1.5 ish

That would not be your heat problem.
your engine and crankcase is sealed right by your leak test .

Jetting or exhaust gasket leak would be where i would dial in on next

[birdman]

Not perfect but as good as it gets without machining the head or risking the transfers not lining up at bdc 

[Zino]

That is a noticeable improvement down .2 mm .
Run it as is and see how you like it .

I used glass plate and sand paper to bring mine down farther

[birdman]

Mar 9, 2021 7:09:21 GMT -5 Zino said:

That is a noticeable improvement down .2 mm .
Run it as is and see how you like it .

I used glass plate and sand paper to bring mine down farther

Did you address the combustion chamber or just the squish band. How did it affect your compression?

[Zino]

I did not adjust the combustion chamber .
I have run no head gasket just copper spray often enough with the athena kit .
That gets squish to about 1.25 to 1.3
If I wanted more I would just sand paper off a .1 mm or so with figure 8's on sand paper and glass.

The last athena install
I had the head decked about.3 mm by a machine shop and then just cleaned up with sand paper down to .9 so i could run the best base gasket set up that let me max out the ports .

When I was a Kid we were real scientific in our approach
We would just keep decking the heads on the snowmobiles until they blew up .
And then promised ourselves we wouldnt go that far the next time .
I make smaller changes these days .

[birdman]

I've been busy but I think I got this build all dialed in. Gears are good. I ditched the pod filter for a malossi E8 filter, rejetted the carb accordingly, switched to a one step colder plug and now my Temps are OK. Held it wide open for a couple miles and Temps stable off in the high 360s low 370s which should be OK for this cast iron kit (I hope lol). Also added a malossi delta clutch and that thing is a huge improvement over my beat up stocker. No side stand yet, still contemplating on getting a malossi shock and maybe a polini torsen arm.. Other than that I'm happy with this bike, high 50s low 60s full tuck with a tail wind, and great low end torque. Now some pics.



Fancy gear cover 🤗



Delta clutch and bell























Glamor shots and an appropriate Keychain 🤗 🤗 🤗 

[yambw’s]

Nice to see it all back together. Looks great! Where’s the key chain from 👀
The buzzetti branded side stands are really good Quality