Brad The Bike Boy: January 2011

Saturday, January 1, 2011

Airbox mods when fitting FCR to Ducati SS and Monster

Last time I fitted some FCR to a 900SS I took some photos of the airbox trimming for future reference and thought I might as well post them here too. To do the trimming I use an electric die grinder with a very coarse conical bit. It looks rather medieval, but when it's honking around at 26,000 rpm it's amazingly easy to use gently.

I find you can refit the breather hose to the airbox too, even though the Sudco instructions say you can't. It can be routed under the throttle cables. You need to round the edge of the box below and behind the breather hole to get it all to fit nicely, but if you go gently you can make enough room.

Cleaning under the fuel pump, etc

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One thing I do when replacing fuel filters on the bikes with removable plates in the bottoms of the fuel tanks (916 series, MV, ST series) is remove the fuel pump from the mount plate and clean under it. On these models the pump's rubber sleeve pushes into the mount tube and is held by a raised ring on the sleeve - you can see the corresponding groove in the photo below. You just pull the pump out (possibly easier said than done), maybe lubing the rubber to make it slide nicely. What you often find under the pump at the bottom of the cavity is shown below - lots of debris and rust. I've seen the cavity full to the bottom of the pump screen with gunk.

749 and 999 have a plastic cover held on the the press nut type of steel clip that you can't reliably reuse, and I haven't spent the time to find the replacements for them yet. Probably the same size as those used to hold the fairing insulations on.

It's always a good idea to have a new O-ring on hand when doing this job, as the one that's been in the tank for some time will usually swell as you remove it. Use lots of grease on the O-ring and tank rolled edge when reassembling, as it's fairly easy to take a piece out of the O-ring which will cause fuel to leak at a significant rate. 916 series, ST series and MV models use the Ducati part 88650011A. 749 and 999 use a smaller ring - 88640331A maybe (from memory).

The Aprilias usually have a black plastic screw on cover over the pump pick up screen, so similarly I always remove and clean the pick up cavity when replacing a fuel filter on them. Like the Ducati models with plastic fuel tanks, there isn't a specified fuel filter replacement interval on the Aprilias. I tend to do them on the 20,000/22,500km service depending on the specified intervals for the particular model. In my experience it's worth doing, as even though you don't get any rust inside the plastic tanks you can still get the gummy build ups.

And on all models always check the breather and cap recess drain tubes or hoses through the tank and hoses external to the tank are clear. If you can't blow throught them, they need to be cleaned. Old cable inners are great for this, as they're flexible, but stiff and strong. Just be careful if you're going through plastic or rubber though.
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The 851

The 400SS

I bought this 400SS (genuine 93 model Australian delivery! Woo hoo huh.) after seeing it in Ebay for what was possibly an good price. As ever, good was too good to be true. Badly repaired and rusted out fuel tank, badly repainted side panels, lots of km (83,000 of the bastards), etc. You know, the usual. Purchased in October 2012, as of now (Jan 2014) I've nearly finished a major service. The cam timing is done with some of the Madasl adjustable pullies that have been drilled in 4 different settings for easy dyno testing. And I have some 900 headers to try a 40mm dual exhaust set up on it (ala M400). Not a great deal of progress for 15 months, so it's taking on a long term feel. There's an F1 endurance style seat base (more taper at the rear) and front fairing sitting around, which will require frame mods to fit. It's a bit of a mental sticking point as this time. But hey, it's not like I can devalue it much more.

The Mighty KR1S 250

How it looked the rainy night someone came to take it away. Painted all black when I bought it, at some point later I realised i could rub the black off and have much of the original colour scheme underneath. Although the main fairing was originally from a red KR1 I think, and definitely badly repaired more than once, so it stayed black. And the tail panel shown was bought to replace the one I smashed the only time I crashed it and the last time I rode it at a Sandown track day. A sensational little bike, holed pistons and frequently failing stator windings aside. The first bike I rode on a race track and the first bike I had my knee down on. And a great commuter too I found. It's sometimes nice to have a bike that won't wheelie past the city speed limit in first gear.