Clanned Posted February 24, 2021 Report Share Posted February 24, 2021 Hello, Anybody ridden a trs one 250 with a high compression head (s3), did you use normal gas or race gas? Looking for some more power for my bike.. Greetz clanned Quote Link to comment Share on other sites More sharing options...
singesavant Posted February 25, 2021 Report Share Posted February 25, 2021 Hi there, I run my trs 250 with a s3 high compression head which give the bike a 12.35 to 1 compression ratio from the 10.5 to 1 as standart. And I run it on 98 regular pump gas. No prob whatsoever as such as pinging or detonation... Davy Quote Link to comment Share on other sites More sharing options...
trials01 Posted February 25, 2021 Report Share Posted February 25, 2021 10 hours ago, singesavant said: How is the bottom end performance with the S3 hi-comp head insert? Does it want to stall easier? (pro's con's?) I already purchased a S3 hi-comp insert for more power, but did not install yet because it took a long time to find the correct jetting on the Keihin carb with the new Boyesen Pro reeds. The TRS 250 had a rough burble between 1/4 to 1/2 throttle when the main jet started to come into play. Had TRS motorcycles since 2017 and this one (2021 250) is the smoothest running one i've owned, next to the 2019 TRS Gold 250. 2021 TRS 250 RR (Boyesen Pro reeds) Hello, Do you find the S3 high compression head to benefit Quote Link to comment Share on other sites More sharing options...
singesavant Posted February 25, 2021 Report Share Posted February 25, 2021 49 minutes ago, trials01 said: Hello, Do you find the S3 high compression head to benefit Alright To be fair, I brought a 300 which I downsized to 250 top end. The top end I bought was a second hand from a Spaniard whom did the opposite change from 250 to 300cc. I got it with both standard and high comp s3 head. When I received it I rushed to instal it and went direct to the s3 high comp for which I measured comp ratio (which I did for both heads)... So I can not tell you what the diff between both, I am sorry! On a side note believe it or not the s3 head and hence head cover (trs not compatible) are from gasgas txt and do fit my trs... Davy Quote Link to comment Share on other sites More sharing options...
Clanned Posted March 2, 2021 Author Report Share Posted March 2, 2021 Anybody idea's where too buy the s3 head? Can't find the high compression head for the trs 250.. Quote Link to comment Share on other sites More sharing options...
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