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| Cold start issues https://ausmini.com/forums/viewtopic.php?f=2&t=101052 |
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| Author: | Soldar [ Wed Jul 14, 2021 2:47 pm ] |
| Post subject: | Cold start issues |
Seems to be affected by ambient temperature, probably only noticed it since the start of winter. In the mornings the 850 takes a while to get going with 2 or 3 goes at starting, then it splutters out if anything more than a tiny bit of throttle or load is applied. Choke is on to start. Takes a bit of revving to warm up a bit and then it mostly goes alright. Will intermittently splutter/misfire randomly for up to 2 minutes after starting. Runs fine after that. Carb is a single SU, using really really light oil in the dashpot (feels similar to WD40). Could this be a trouble or is it more likely to be ignition? |
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| Author: | Steam [ Wed Jul 14, 2021 5:23 pm ] |
| Post subject: | Re: Cold start issues |
I have always found WD40 too watery, I use 10w air tool / compressor oil. Make sure the fast idle is set correctly but a good check over both fuel and ignition will help. |
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| Author: | Oscar [ Thu Jul 15, 2021 9:55 am ] |
| Post subject: | Re: Cold start issues |
Yes you need something to slow the rise of the piston a bit to prevent lean-out. Auto trans fluid has been my dashpot choice for decades. |
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| Author: | Soldar [ Thu Jul 15, 2021 4:09 pm ] |
| Post subject: | Re: Cold start issues |
Thank you both, I will try air tool oil and report back tomorrow. What do you mean by 'fast idle' - is that idle under choke? |
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| Author: | timmy201 [ Thu Jul 15, 2021 5:01 pm ] |
| Post subject: | Re: Cold start issues |
When you pull the choke all the way up, it should also open the throttle. There is a screw to adjust the fast idle setting |
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| Author: | Soldar [ Fri Jul 16, 2021 11:51 am ] |
| Post subject: | Re: Cold start issues |
Thanks, yes it does increase the throttle quite a lot. Air compressor oil in the dashpot (boy these are easy to overfill!) has made all the difference to starting and driving while warming up - thanks so much everyone! |
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