Member Contributer Simbsonite Posted January 11, 2018 Member Contributer Share Posted January 11, 2018 Has anyone done a chain and sprocket kit on their bike, I recently did mine as -1/+2 520 conversion and now the bike keeps loosing what gear it’s in on the dash. It just displayed a flashing line instead. anyone had this issue and been able to rectify it? Link to comment Share on other sites More sharing options...
Member Contributer Grum Posted January 11, 2018 Member Contributer Share Posted January 11, 2018 Hi Simbsonite. Welcome to the forum. Sadly it does state in the Service Manual (see the Yellow Hi Lighted Text Below) that changing the sprockets will cause this to happen with your Gear Position Indication. As the ECM somehow calculates and compares the logical gear position from the three gear switches as well as speed versus rpm, unless all this crap matches up you'll get your flashing line! So it doesn't look like an easy fix for your mod. Gear position indication is nice but not the end of the world without it! Download the 8gen Service Manual from the Home Page. Cheers. Grum. Link to comment Share on other sites More sharing options...
Kwee69 Posted January 11, 2018 Share Posted January 11, 2018 2 hours ago, Grum said: Hi Simbsonite. Welcome to the forum. Sadly it does state in the Service Manual (see the Yellow Hi Lighted Text Below) that changing the sprockets will cause this to happen with your Gear Position Indication. As the ECM somehow calculates and compares the logical gear position from the three gear switches as well as speed versus rpm, unless all this crap matches up you'll get your flashing line! So it doesn't look like an easy fix for your mod. Gear position indication is nice but not the end of the world without it! Download the 8gen Service Manual from the Home Page. Cheers. Grum. Can fuck up quickshifter as well Link to comment Share on other sites More sharing options...
Killerkingdon Posted January 11, 2018 Share Posted January 11, 2018 What if you only went down -1 on the front or up 2 on the rear? Meaning will it flash with any change or is there a more moderate change that will allow use of the gear indicator and a bit more torque. I only need just a little on the bottom end and was hoping with just a on tooth change I could still get the best of both worlds. Link to comment Share on other sites More sharing options...
Member Contributer Thumbs Posted January 11, 2018 Member Contributer Share Posted January 11, 2018 Unless all the factors in the ECU equation from all three sensors are proportionally correct it will always show a fault Link to comment Share on other sites More sharing options...
Member Contributer Grum Posted January 11, 2018 Member Contributer Share Posted January 11, 2018 8 hours ago, Killerkingdon said: What if you only went down -1 on the front or up 2 on the rear? Meaning will it flash with any change or is there a more moderate change that will allow use of the gear indicator and a bit more torque. I only need just a little on the bottom end and was hoping with just a on tooth change I could still get the best of both worlds. It appears dropping the front ONLY by -1 doesn't upset anything. See Sprocket Change thread. Link to comment Share on other sites More sharing options...
Killerkingdon Posted January 11, 2018 Share Posted January 11, 2018 Just looked it up and added another post - it appears that way, but waiting for confirmation. and thanks! owe you one Grum. Link to comment Share on other sites More sharing options...
FastM Posted January 16, 2018 Share Posted January 16, 2018 I went -1 on front with the stock chain and gear indicator works fine. Link to comment Share on other sites More sharing options...
Killerkingdon Posted January 16, 2018 Share Posted January 16, 2018 2 hours ago, FastM said: I went -1 on front with the stock chain and gear indicator works fine. got a link to the place you purchased? Have seen JT sprocket posted, but wanted to duplicate someone else. Link to comment Share on other sites More sharing options...
FastM Posted January 17, 2018 Share Posted January 17, 2018 Purchased on Ebay - JT 525 15T Front Sprocket for 1991-03 CB750 14-17 VFR800F VTEC ABS JTF1332.15 for $15.96 (US). From jra_jentschracing Link to comment Share on other sites More sharing options...
Member Contributer Bent Posted January 18, 2018 Member Contributer Share Posted January 18, 2018 I get why the bike doesn't really need a 525 but why not just stay with OEM? Honda used a 525 for some reason. Just wondering again..... Link to comment Share on other sites More sharing options...
Member Contributer fink Posted January 18, 2018 Member Contributer Share Posted January 18, 2018 10 hours ago, Bent said: I get why the bike doesn't really need a 525 but why not just stay with OEM? Honda used a 525 for some reason. Just wondering again..... To save 100-200 grams on sprung weight. I can only assume. Im in the stick to factory spec book Mesel. Link to comment Share on other sites More sharing options...
jhenley17 Posted January 18, 2018 Share Posted January 18, 2018 520 was easiest for me to find quickly. I really don't care about a tiny weight savings, but I'll take it.Sent from my iPhone using Tapatalk Link to comment Share on other sites More sharing options...
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