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?
[image: image.jpg]
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.
[image: VFR800F_Gear_Position001.jpg]
2 hours ago, GrumHi 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.
[image: VFR800F_Gear_Position001.jpg]
Can fuck up quickshifter as well
[image: Screenshot_20180111-145907.png]
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.
Unless all the factors in the ECU equation from all three sensors are proportionally correct it will always show a fault
8 hours ago, KillerkingdonWhat 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.
Just looked it up and added another post - it appears that way, but waiting for confirmation. and thanks! owe you one Grum.
I went -1 on front with the stock chain and gear indicator works fine.
2 hours ago, FastMI 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.
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
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.....
10 hours ago, BentI 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.
520 was easiest for me to find quickly. I really don't care about a tiny weight savings, but I'll take it.
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