Well after several tormenting hours of trying to love a seemingly dead engine, I had a visit to fellow madmodder, Kwackers, today and brought it with me. Last night I`d had enough. It was popping and spluttering but wouldn`t start and then just before I called it a day there was a terrible binding and bumping on the crank shaft.
So this morning I got there and looking a right t1t, within 30 seconds he identified one of my bearings in the frame had died. OK OK I packed up quickly last night and so I promised him that wasn`t the issue. Then we looked at the valve block and it wasn`t holding a seal - I assured him it had been, we took the valve off and stripped it down and a piece of sh1t in the valve was holding it open - looked like a t1t for the second time - I assured him that wasn`t the issue. Anyway, we had a look at the rest of the engine and it was good just to have another set of eyes spotting any potential problems. He thought the compression was good enough without the O-ring and had concerns about the weight of the intake spring. He also went through the process of setting it all up.
So when I got home I setup as he described. Replaced the bearings that had broke and set the timing up as he said. Hurray it ran
![:ddb:](https://madmodder.net/Smileys/default/dancenana.gif)
but for only 10 seconds or so again. It did this more concistently. So I then guessed that it wasn`t getting fuel correctly and trimmed down a bit off the spring. Put it all back together and first kick we were flying!!
![:ddb:](https://madmodder.net/Smileys/default/dancenana.gif)
It ran for about 1 minute and then I accidently killed it by opening the air intake and making the mix too lean.
I kicked it up again and thankfully it started (I`ve been having a problem with concistency!) and I let it run for a good 5 minutes then stopped it and let it cool down for 5 minutes.
![:ddb:](https://madmodder.net/Smileys/default/dancenana.gif)
I then fired it up again and watched it more closely, after 3 minutes I stopped it to adjust the ignition timing and go get my camera for the proof of running shot
![:lol:](https://madmodder.net/Smileys/default/kranke_200-1.gif)
I started the engine up...
![:ddb:](https://madmodder.net/Smileys/default/dancenana.gif)
and then all of a sudden it just kept reving higher and higher, within the space of a few seconds I was so flustered that with the camera stuck in one hand I couldn`t shut it off and then crack!!!
![:doh:](https://madmodder.net/Smileys/default/doh-45.gif)
![](http://raynerd.co.uk/wp-content/upLoads/conbroke.jpg)
The con-rod wall of the big end cracked! Not to worry at all. I think the photo clearly shows that it did run and it did run well !! (either that or I`m lieing and I cobbed it through the window and it broke!!)
So now I`m going to make another con-rod but to be honest, I`m confident it runs so I`m going to polish some parts, make a base and go for a more final assembly! So I promise.... it runs, it runs, it runs!
![:ddb:](https://madmodder.net/Smileys/default/dancenana.gif)
I just need to learn how to control it! I guess the mixture needs to be more lean? Why did it just take off?
Chris