Fatboy2017

Is this what you're after? Stihl MSA220 service manual.pdf Stihl MSA220 IPL.pdf

Post some photos of the saws. To be honest they sound like Chinese clones, Stihl don't normally put 440 on the clutch cover, but the clones do!

With regards to the CAT you can do it two ways, either pick / drill then grind out the CAT centre and then slightly increase the outlet hole ( under the spark arrestor area or grind the welds off with a die grinder bit and remove the whole CAT including the outer tube, also increase the outlet slightly, this takes out a bit more weight than removing jut the centre, plus no chance of leaving any CAT material stuck on the tube, lessening the chance of it coming off in future and being consumed by the motor. Even after a few chain coming off episodes It never took off the chain catcher but for sure it won't do any harm to fit a rubber to it, I just bought a new spare cover ( very cheap) just in case!

I find GATOR chain oil to work well and a good price

The other thing to note is that the 3500 really benefit from a CAT removal and a retune, only a very slight increase in noise but an improvement in performance and a lot less heat

Firstly, good choice on your 3500! I have a couple and find them a good saw which punches above it's weight. They are built very well and include many features from pro saws. They always start well and even when fitted with the easy start system which, once you get it into your head of how it functions, have had no problems with the 3500's. Only criticism is they weigh slightly more than they should but this is because of the build quality and this is outweighed by the performance. My saws came with the small radius bars as yours and had a few issues of freezing tips due to debris in the outer sprocket and a number of chains derailing, which is something I ever generally have a problem with. I tried different chains but this problem persisted. Whilst hedging, pruning and pollarding this was a daily occurrence. After reading about others having the same problem ( on this forum) I tried the larger radius bars and this immediately solved the problems. I did not find any increased feeling of any more inclination towards kickback, I actually felt the saw was more controllable, if that makes sense. In my opinion try the larger radius bar and draw your own conclusion, it would be interesting to get another opinion as always.

In the first picture it looks like there is a quite a build up of carbon? Could be carbon damage? What oil and ratio do you run?

I heard of someone used one of these in conjunction with his coil Ignition Coil – Red – 2 Pin | DBRacing DBRACING.CO.UK

What I was suggesting for £10 it's worth trying one of the cheap dual port ones, if it is better then you can make the choice if you want to pay over £100 for a modified OE one. The cheap ones are ok for firewood users but if used as a production / heavy user then of course they won't last as long, I've used them on Husky 55 and 365 and they were ok.

Exhausts are available aftermarket on ebay very cheap, worth buying to try and not to damage the original. When you get the standard one off, the weight will tell you if there is much inside. I don't have personal experience of MM a 361.

I assume you have the early type steel oil pump drive scroll, if you do you need item 21 plus associated spacers etc on parts diagram below, if you can't find one let me know. Probably L&S Engineering can supply the later part but not item 21 as I think NLA now. The later set up as per parts diagram are much better as the oil pump drive only when the chain is running, but you would have to change the oil pump and pump drive and washers etc, or get yourself a 520 parts saw as they come quite cheap and plentiful. Makita DCS 430 520 parts manual.pdfMakita DCS 430 520 parts manual.pdf

This is where the ones I have used came from, I think they all come from the same factory, but who knows! Ignition Coil Module For Dolmar 112 113 114 116 120si PS6000 PS6800 030143040 WWW.EBAY.CO.UK Replace Part # for. We promise that sovle any problems if you had.

Just use the one for example from 6000/6800i, you can use this later coil as a replacement for even early points saws 112 etc. You can find s/h or new ones or use AM ones. I have used both and to be honest I have had 100% success rate ( probably 20 odd) from the AM ones I used. You just have to fit a spade connector on the wire and shave a little off the post to allow the coil to fit flush, it is obvious when you come to fit one. Unscrew and cut HT lead to length. They are about £16 each. Of course fitting AM can be a crap shoot but it's your choice. Just make sure to use NGK BPMR7A spark plugs

All 5 are the same. Same on 116, 116i,120i and 6000i /6800i even 9010 fit. Its possible that the mounting came loose at some time and enlarged the thread in the tank and somebody fitted a mount from something none Dolmar. If so, maybe helicoil and fit new original mounts. Mounts still available from L& S Engineering. Plenty of s/h tanks around, both metal and plastic.

For 40;1 for 5litres add 125ml of 2 stroke oil.