tcrhino Posted December 9, 2018 Report Share Posted December 9, 2018 Last week I had a high compression cylinder head insert installed on my 250 (S3 insert). Compared it with a standard 250 of the same year (at the dealer's) and it feels much stronger and runs cleaner. So very happy with the result. The high compression is noticeable when starting, but it still starts with the first kick warm, three when cold. Strange thing is that the idle went up. Stalling it now is almost impossible, but clutch control needs some adaption. Any thoughts how idle can increase by a high compression insert? Quote Link to comment Share on other sites More sharing options...
2stroke4stroke Posted December 9, 2018 Report Share Posted December 9, 2018 You are completely changing one part of the combustion equation - something is bound to be affected, in this case the lower end of the "carburetion". Presumably the ECU needs to be told that the compression has changed? Quote Link to comment Share on other sites More sharing options...
tcrhino Posted December 9, 2018 Author Report Share Posted December 9, 2018 2 hours ago, 2stroke4stroke said: You are completely changing one part of the combustion equation - something is bound to be affected, in this case the lower end of the "carburetion". Presumably the ECU needs to be told that the compression has changed? According to the dealer remapping of the ECU wasn't required. It does run really great with the high compression insert. BTW: the higher idle doesn't bother me at all. Quote Link to comment Share on other sites More sharing options...
maxwell smart Posted December 9, 2018 Report Share Posted December 9, 2018 Hi Tcrhino, I believe increase in compression = greater engine efficiency. with the result as u notice increase in idle and fewer flameouts. I was reading an article a few years ago about direct injection in modern automobile engines creating an opportunity to raise compression, with the goal of increasing mileage as well as horsepower. I could be wrong as im no expert. just my opinion. Maxwell Quote Link to comment Share on other sites More sharing options...
tcrhino Posted December 10, 2018 Author Report Share Posted December 10, 2018 17 hours ago, maxwell smart said: Hi Tcrhino, I believe increase in compression = greater engine efficiency. with the result as u notice increase in idle and fewer flameouts. I was reading an article a few years ago about direct injection in modern automobile engines creating an opportunity to raise compression, with the goal of increasing mileage as well as horsepower. I could be wrong as im no expert. just my opinion. Maxwell To me that makes sense (no expert as well). Same throttle position (closed) and same fuel injection (no other map), but increased idle means more efficient use of the available air/fuel mixture... 1 Quote Link to comment Share on other sites More sharing options...
jsp Posted December 18, 2018 Report Share Posted December 18, 2018 tcrhino, what year bike have you fitted this insert to ? Quote Link to comment Share on other sites More sharing options...
tcrhino Posted December 18, 2018 Author Report Share Posted December 18, 2018 7 hours ago, jsp said: tcrhino, what year bike have you fitted this insert to ? It was fitted to a 2017 Ice Hell 250 Quote Link to comment Share on other sites More sharing options...
smegyboy Posted December 20, 2018 Report Share Posted December 20, 2018 Hi Tcrhino , where did you buy this part please and was it easy to fit ?? Quote Link to comment Share on other sites More sharing options...
tcrhino Posted December 20, 2018 Author Report Share Posted December 20, 2018 3 hours ago, smegyboy said: Hi Tcrhino , where did you buy this part please and was it easy to fit ?? My dealer -and Vertigo importer for The Netherlands- (Nonstopmotoren.com) sourced the part from S3. Dealer did the installation and I watched how it was done. Installation was a bit fiddly because the fan housing is blocking one of the head bolts. Easiest would be to remove the radiator and fan (water is out anyway), but the mechanic managed to do it by only removing the fan. Using new o-rings is important as is applying the correct torque to the head bolts. With a bit of patience and the proper tools it's possible to do yourself. Quote Link to comment Share on other sites More sharing options...
Alexle Posted February 5, 2022 Report Share Posted February 5, 2022 Wondering if anyone else has tried a high compression insert on a 250 vertigo? Quote Link to comment Share on other sites More sharing options...
Tiewrap Posted February 5, 2022 Report Share Posted February 5, 2022 U would think the mixture is changed. Or the particles that find each other, something like that. Nog engine knocking ? They seem to be sensitive for that ? Are u maybe by coincidence sometimes in Nunspeet ? Quote Link to comment Share on other sites More sharing options...
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