20 replies to this topic

[Tonylamb]

Thanks AC I took a look at the link. I'll take a look at the damper piston per your link and see if I can cure the flat spot by getting the damper piston sorted. The only problem I have is I think its already been done on the one I have. I'll take a look.

Cheers for the help.

[Tonylamb]

This is the piston in the carb. Doesn't seem to have had any work done on it and also doesn't seem to have the extra washer that you suggest I reduce in size to assist drop? Possibly the wrong piston altogether for the application i want?

Attached Files

•  damper piston.jpg   25.54K   2 downloads

[Tonylamb]

research seems to show that this is a 2085 but your video on facebook seemed to have more washers above the bottom plunger. perhaps that was you modifying a different piston?

[ACDodd]

What it looks like is of no concern. It’s the response of the piston that’s matters, do the test and see what you get.

Ac

[Tonylamb]

LoL thanks AC will do.

[Tonylamb]

So I took the dashpot off and did AC's test. Very slow and hard to push up but actually fell pretty quickly. The new damper 2085 arrived in the post this morning so I decided to experiment with the old one. I filed a little bit off the sides of the bottom part and ran a file round the top ring. Didn't make a huge difference so emptied the damper out and replaced the oil (was 20/50) with proper SU oil.

Well its a different car frankly no hesitation. pretty instant throttle response when you go back on the power from a gear change. Does feel like there is a little less power at the very top end but I suspect that is my imagination.

Oddly I'm a little dissapointed as if I couldnt fix it i was going to buy the twin HS4's. I suppose its £400 saved though. LOL

Thanks everyone in particular AC for the advice.