sueossap Posted July 16 Report Share Posted July 16 My ossa runs fine on trial and enduro sections but overheats on any short road sections ? Fan seems to be working and head seems ok ? Any ideas ? Quote Link to comment Share on other sites More sharing options...
lemur Posted July 16 Report Share Posted July 16 Fuel mixture too lean? Pull the spark plug after it acts up and see what it looks like. It's called a 'plug chop' Quote Link to comment Share on other sites More sharing options...
konrad Posted July 16 Report Share Posted July 16 Do you have the dual map capability? There were specific richer maps for road use. Pure water has the best heat transfer properties. The more antifreeze in the cooling water, the worse the heat transfer becomes. Of course, no antifreeze means you lose boil-over and corrosion protection. I have used a product called MoCool by Motul in roadracers where antifreeze is prohibited: https://www.motul.com/lv/en/products/mocool Quote Link to comment Share on other sites More sharing options...
sueossap Posted Tuesday at 06:04 PM Author Report Share Posted Tuesday at 06:04 PM Thanks it is dual mapped wild and mild , does that mean remapping the ECU ? had summer coolant in it , but that boiled and now replaced for water . just odd that you can throttle it to bits in 3rd and 4th all day on trials but boils over after 10 mins in 5th and 6th on road Quote Link to comment Share on other sites More sharing options...
sueossap Posted Tuesday at 06:47 PM Author Report Share Posted Tuesday at 06:47 PM Mixture is 100/1 as birketts recommend Quote Link to comment Share on other sites More sharing options...
konrad Posted Tuesday at 07:21 PM Report Share Posted Tuesday at 07:21 PM The radiator is in an atypical place on the OSSA. I suspect the fan can't push as much air through it as if it were hanging out in the breeze like a conventional trials bike. I'd be curious what 2 maps are in your bike. As far as I know there never was a hard/soft map combination. Here is a list of the final .KDA maps produced: https://www.ossa-efi.com/home/pc-software/map-loading-software K-Scan will tell you what map is in the ECU, but won't change it. Quote Link to comment Share on other sites More sharing options...
sueossap Posted Wednesday at 07:23 AM Author Report Share Posted Wednesday at 07:23 AM Thanks that’s really interesting I’m on the factory engine with the termi exhaust so will try the road sections in Map 2 setting and see how it goes , and heat protect the seat as burnt my ass 😀 as termis aren’t designed for the explorer seat conversion . Quote Link to comment Share on other sites More sharing options...
konrad Posted Wednesday at 12:05 PM Report Share Posted Wednesday at 12:05 PM Also, using K-Scan you can globally enrich the mixture (up to 15%). The will help cooling, but also will tend to soften the performance (which might be a good thing for a Factory being ridden as an Explorer). Globally enriching the mixture will also decrease range by a corresponding percentage. Quote Link to comment Share on other sites More sharing options...
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