hahaha
Yea was a mint day at Ruapuna, fun wee track - missed having a blast around it.
Windle was great in practice and the first race, really pulled strong and gave no issues at all, good starts off the line and Ella had plenty of fun and didn't fall offor should I say I didn't throw her off.
2nd race was good, first lap but then the motor sort of went flat, like it was running out of fuel, remembering i hadn't put any in and we had done 2 sessions already so I nursed it home and got myself a DNF which is always great.
Checked fuel tank, still had a bit in it but thought maybe was too little for the pick up. Filled it to the brim and got ready for last race.
Last race, warm up lap was fine. Lined her up, Lights go out and she went flat straight away off the line, bizarre. Its a different issue to what it used to do, doesn't surge or misfire, just bascially bogs down/goes flat. We finished the race and still managed to beat Phil n Stephen on the Agip bike who were getting quicker every lap.
But yea, sadly Windle still appears to be hanging on to an issue.. I'm going to carry on looking at the fueling side of things. It is definitely better with the pre filter before the pump removed. And I thought it was sorted as the first 2 sessions it was flying.
final note the windle is very consistent with beiing good for 1 or 2 sessions and then runs like shit for the last 2 sessions.. done it like this for the last 3 meetings now..
just bizarre, but nevermind. I recon must be close to sorting it. Put a better fuel pump on next, check all the fuel lines for deterioration/blocks and will have a look at the fuel tank - allthough still bizarre that it can run mint for 2 complete sessions/races with no issues, and then decide to starve itself of fuel for the afternoon.. anyway - rambling on, recon we have it sorted pretty soon with just a few more trial and error attempts.
Still happy with how it went, chassis feels mint, brakes are mint, everything is mint except these niggling issues with the motor.. its never stalled, its never cut out completely, it always starts etc.. so hoping a bit more fiddling with fuel delivery and it will be all come together. We are starting to panel and paint it too now so hopefully that will be done for Wanganui.
Having worked through the Windle in question whilst it was in Dave's possession, I still believe the issues you are experiencing arise from either the pickup or the fuel return position. The issues you describe are EXACTLY what Dave had going on.
The pre-filter was put there as there was NO filter at all, so any crap introduced to the tank was going straight through the pump.
The filter used was a recommended by Steve/Bob so I'm certain he knew what to suggest (being a mechanic by trade and a very successful sidecar racer/mechanic). If you choose to use no filter, at least take a spare pump or ensure your fuel is filtered before going into the tank.
The return line enters the tank directly above the pickup, possibly causing aeration of the fuel. This was to be rectified but Dave sold the chair before we could look at it. As the tank was originally built/designed for a carburetted 600 (Yam YZF600 Thundercat), maybe the pickup is too restricted?
The fuel lines were checked for any blockages at the HAGD when the issues become most apparent. It ran mint for a fair bit of the morning, and then started playing up. The only parts that weren't fully tested were the regulator )as the correct tools to do so were not at the track) and the injectors (have no idea when these were checked for flow rates, had the filters replaced or cleaned).
He should just sell it to me
The two best part number fuel filters for EFI sidecars are Repco EF120 or EF 135 depending on if you want straight through, or 90 degree.
They are the correct line size, can handle the pressure & are compact.
They should be mounted in foam to prevent the element breaking off inside them, causing a restriction & should be replaced before every season.
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