February 12, 20242 yr Hi there, did anyone successfully installed an S3 low compression insert on a 300 RR MY22, the yellow one? I tried today but the gas tank is not fitting anymore. The sparkplug is way to close because they say to use a BPR5ES. And you will need one with a long thread. See pictures.. just tried it out before installing by putting the insert and spark plug at the spot. Any idea? The only way I see is to turn down the thread of the insert to fit the very short genuine spark plug. https://www.s3parts.com/en/cylinder-head/357-cylinder-head-trrs That's all S3 provides and you can see by comparing the pictures that one stands out. Best regards Felix
February 12, 20242 yr 57 minutes ago, femi said: The only way I see is to turn down the thread of the insert to fit the very short genuine spark plug. If you turn down the insert, will the "cover" still fit?
February 14, 20242 yr Splat Shop - S3 - TRS Cylinder Head Inserts (Fits Original Head) 250 / 280 / 300cc The link above is to TRS head inserts, read the bit that says 'please note'. It seems they do two different inserts.
February 14, 20242 yr Author It's pretty confusing.. Meanwhile I received a picture from the dealer that S3 sent to them. It shows a high comp. insert with long thread (that obviously worked with stock bike). On their website they only show the low comp. insert with long thread. On that page the high comp. insert has short thread. 🤯 So as splatshop says it's a surprise. But unfortunately the long thread and spark plug don't fit my stock bike. I ordered a bunch of spark plug connectors.. maybe one of them is tiny enough to fit. I'll keep you posted, if anyone has the same issue in future.
February 15, 20242 yr A wild one, but Is your engine in straight? Youve got the front down tubes out, is your engine resting on something that is canting it backwards a little? I doubt theres that much play in the other 2 engine mounts (i assume theres two others on a trs). Your head steady is still on too proabably, but clutching at straws here Not sure about ngk, but ive seen other makes with the standard 3/4 reach but with a shorter insulator section. If the dealer isnt wanting to swap it out for th eother length, i think the easiest may be just to get it machined down to fit the short reach plug Edited February 15, 20242 yr by faussy
February 15, 20242 yr Author I can't imagine the engine is turned towards the gas tank so much only by just taking away the both front down brackets. But it's a fact I'll check later.. will just put one bracket in to see if it gets anywhere. Thanks a lot for the idea!! 🙋♂️
February 15, 20242 yr 3 hours ago, femi said: I can't imagine the engine is turned towards the gas tank so much only by just taking away the both front down brackets. Me neither 😂
February 15, 20242 yr Author Nope, putting the lower front brackets back in didn't change anything. But thanks for your thoughts anyway.
February 19, 20242 yr Author Fixed it. 🎉 There is a tiny spark plug connector from Beru O4S. There is good clearance with this one. NGK LZFH - is working as well, the one for M4 thread terminal. LZEH with SAE terminal is a little bit higher and does not work as good as LZFH. Edited February 19, 20242 yr by femi
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