| ausmini https://ausmini.com/forums/ |
|
| Fuel spitting back through one side of Dellorto https://ausmini.com/forums/viewtopic.php?f=2&t=101451 |
Page 1 of 1 |
| Author: | timmy201 [ Fri Jul 22, 2022 1:38 pm ] |
| Post subject: | Fuel spitting back through one side of Dellorto |
Hi all, I decided to drive the mini to work today as some fault finding before Rylstone & it started running really weird just before I got to work: OK at idle & low rpm Once I rev it up it was making a popping sound I got to work and pulled off the ramflo and it's popping fuel back through the RH side barrel. Ramflo was damp from fuel on that side Plug 1&2 look fine, a nice tan colour Plug 4 is black and sooty Plug 3 is black and wet I tried: New plugs - no improvement New distributor cap - no improvement If I pull off the spark plug lead to #3 while running it stops the spitting back Any ideas? |
|
| Author: | drmini in aust [ Fri Jul 22, 2022 1:54 pm ] |
| Post subject: | Re: Fuel spitting back through one side of Dellorto |
When mine did similar once it was the filter foam broken and got sucked in against the aux venturi. Also check your valve clearances, if an inlet is riding that can do it too. Could also be an air leak at the manifold, 'sneezing' is a symptom of a lean mixture. |
|
| Author: | timmy201 [ Fri Jul 22, 2022 4:14 pm ] |
| Post subject: | Re: Fuel spitting back through one side of Dellorto |
Thanks Kev. Checked the valves and they are all moving and have clearance when on the base side of the cam I'll have to start the autopsy now I've got it towed home... |
|
| Author: | FNQ [ Sat Jul 23, 2022 10:53 am ] |
| Post subject: | Re: Fuel spitting back through one side of Dellorto |
Check that one of the aux venturies isn't spinning or offset? |
|
| Author: | timmy201 [ Sun Jul 24, 2022 6:27 pm ] |
| Post subject: | Re: Fuel spitting back through one side of Dellorto |
This sure explains a lot! When I put on this gasket in mid 2020 there was absolutely no stock of small bore gaskets, so I had to use the budget copper one I had in the garage. It's probably not designed for big overbores and it overhung the cylinder bore. I have a Victor Reinz one to go on now 
|
|
| Author: | MINIRO [ Sun Jul 24, 2022 7:21 pm ] |
| Post subject: | Re: Fuel spitting back through one side of Dellorto |
timmy201 wrote: This sure explains a lot! When I put on this gasket in mid 2020 there was absolutely no stock of small bore gaskets, so I had to use the budget copper one I had in the garage. It's probably not designed for big overbores and it overhung the cylinder bore. I have a Victor Reinz one to go on now Where did you get the new gasket? I may be looking to replace my copper gasket with a composite one... ideally in time prior to Rylstone. |
|
| Author: | timmy201 [ Sun Jul 24, 2022 7:24 pm ] |
| Post subject: | Re: Fuel spitting back through one side of Dellorto |
Karcraft had the Victor Reinz ones, but I think most mini shops should have them by now I saw your photo of your rad cap, I’d give it a clean and see if the scum comes back. It might just be some residue in the block as it’s a fresh build |
|
| Page 1 of 1 | All times are UTC + 10 hours |
| Powered by phpBB® Forum Software © phpBB Group http://www.phpbb.com/ |
|