Search found 334 matches

by allan.walker
Tue Jan 23, 2024 8:12 am
Forum: Main Chat Forum
Topic: WD 40 Type Liquids
Replies: 8
Views: 724

Re: WD 40 Type Liquids

What would you be using it for? If it's for preventing corrosion, it's not great, as has already been mentioned.
Have you seen this?
https://www.bennetts.co.uk/bikesocial/r ... -inhibitor
by allan.walker
Tue Dec 19, 2023 8:47 am
Forum: Four stroke
Topic: Sq4 Mk2 Rocker Arm Wear
Replies: 5
Views: 441

Re: Sq4 Mk2 Rocker Arm Wear

Hi Johnny,
I don't see any specific references on the Draganfly website, just a general mention of engineering services. I'll phone them and ask.
by allan.walker
Mon Dec 18, 2023 5:53 pm
Forum: Four stroke
Topic: Sq4 Mk2 Rocker Arm Wear
Replies: 5
Views: 441

Re: Sq4 Mk2 Rocker Arm Wear

Thanks, Roger. It looks like all the rockers are beyond the .060" limit so will need building-up and grinding.
The next question is, who in the UK does this kind of work? Does anyone have any experience of having this work carried out?
by allan.walker
Mon Dec 18, 2023 1:58 pm
Forum: Four stroke
Topic: Sq4 Mk2 Rocker Arm Wear
Replies: 5
Views: 441

Sq4 Mk2 Rocker Arm Wear

I'm in the process of building a Mk2 engine from accumulated parts. I have a set of rockers (B-type, with adjuster over the pushrod) and they all show a noticeable wear ridge on the pad which contacts the valve stem end. What is the best option for repairing them? Can they be ground/stoned back to t...
by allan.walker
Thu Nov 23, 2023 8:20 am
Forum: Four stroke
Topic: sq4 Coupling gear play
Replies: 4
Views: 355

Re: sq4 Coupling gear play

An interesting question! I'm sorry that I can't offer any specific advice on this, but I do wonder that if the play is not acceptable, what can be done about it? Both of my Square Fours have some play in the meshing of the coupling gears, but I just live with it. Someone else will be along with a mo...
by allan.walker
Wed Nov 22, 2023 9:41 am
Forum: Four stroke
Topic: Damaged piston
Replies: 8
Views: 494

Re: Damaged piston

Thanks for all the replies.
The general consensus seems to be that it should be ok. Crack testing using dye sounds like a good idea. The pistons are +40 thou, if anyone has one...
I'll have a good think.
by allan.walker
Tue Nov 21, 2023 5:34 pm
Forum: Four stroke
Topic: Damaged piston
Replies: 8
Views: 494

Re: Damaged piston

The piston came to me in the condition shown, so I don't know what the 'shrapnel' may have looked like.
That's two replies in favour, any against?
by allan.walker
Tue Nov 21, 2023 9:57 am
Forum: Four stroke
Topic: Damaged piston
Replies: 8
Views: 494

Re: Damaged piston

Thanks, Roger. There is a question as to how the damage occurred. I don't know if the engine it was in had stopped with a bang, or whether the piston was originally fitted with a piece missing. My concern is, why would someone do that? I follow your logic about it only being a relatively small piece...
by allan.walker
Tue Nov 21, 2023 8:55 am
Forum: Four stroke
Topic: Damaged piston
Replies: 8
Views: 494

Damaged piston

Please don't shoot me down in flames, but would it be safe to use this piston in a Square Four? The missing piece is on the main thrust face (where the arrow on the crown points.) The piston had been in use for a very low mileage in another engine and is otherwise sound. Would that amount missing le...
by allan.walker
Mon Oct 16, 2023 7:56 am
Forum: Four stroke
Topic: Late Clutch Centre 3355-57
Replies: 2
Views: 284

Re: Late Clutch Centre 3355-57

Thanks, Roger. Just what I need to know.