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1983 Yamaha XT500, 1999 GSXR750 FI, 1995 Yamaha XT600, 2006 GSXR 750, 2005 GSR600, 2005 GSXR750
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14 Posts
Discussion Starter · #1 ·
Hi Guys
Just wondering is it normal to have a very touchy throttle after replacing the STVA, had the C28 code. pulled the STVA apart to find previous repair on solder connections. Decided it would be better to replace with a brand new second hand unit. Fitted it today and C28 gone but C22 still active. Took the K5 for a short ride to test now my throttle almost has a dead spot when trying to cruise at speed...any speed then wil accelerate on the slightest correction on the throttle. Accelerates ok (still need to install STVA butterflies). Will be ordering the AP sensor (no trace of it on the bike, harness and plug found but no sensor) and installing the butterflies over the weekend maybe that will solve the issue...or I hope to atleast not have the FI light on.

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1983 Yamaha XT500, 1999 GSXR750 FI, 1995 Yamaha XT600, 2006 GSXR 750, 2005 GSR600, 2005 GSXR750
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14 Posts
Discussion Starter · #3 ·
Hi @Chuckster
It is the AP, the IAP is C13 did check it. Ordered the AP earlier tonight will see if that fixes the problems.
 

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1983 Yamaha XT500, 1999 GSXR750 FI, 1995 Yamaha XT600, 2006 GSXR 750, 2005 GSR600, 2005 GSXR750
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14 Posts
Discussion Starter · #5 ·
Update
Replaced the STVA and road test the bike, no more C28. Installed the butterflies and C28 reappeared. Started trouble shooting per the manual.

STVA - Good

Removed all fairings and checked wiring no visible issues accept it being untidy. So grabbed so tools harness tape and cleaned the mess up. Cleaned all connectors and reinstalled. Check resistance on the STP sensor its was high: 1.6 kohm. Adjusted it down lowest I can go is 1kohm, Tested again and only have 1 fault code C22.

The AP sensor I order should arrive early this week. then hopefully no more FI light

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1983 Yamaha XT500, 1999 GSXR750 FI, 1995 Yamaha XT600, 2006 GSXR 750, 2005 GSR600, 2005 GSXR750
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14 Posts
Discussion Starter · #7 ·
@Lewis 999999
Dont think you can bypass the STVA, options are to repair or have a FI light on permanently

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You can on other models 750 and 600. Healtech sell an electronic setup to eliminate the fi light for stva. I have seen old discussions on here where people have researched the circuitry and made their own . This is what I am looking for.
 

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1983 Yamaha XT500, 1999 GSXR750 FI, 1995 Yamaha XT600, 2006 GSXR 750, 2005 GSR600, 2005 GSXR750
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14 Posts
Discussion Starter · #9 ·


Just found this

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1983 Yamaha XT500, 1999 GSXR750 FI, 1995 Yamaha XT600, 2006 GSXR 750, 2005 GSR600, 2005 GSXR750
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14 Posts
Discussion Starter · #10 ·


Just found this

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1983 Yamaha XT500, 1999 GSXR750 FI, 1995 Yamaha XT600, 2006 GSXR 750, 2005 GSR600, 2005 GSXR750
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14 Posts
Discussion Starter · #12 · (Edited)
Update
Got the AP sensor in the mail and it was incorrect...


But then my bike decided to not start after standing two days, checked the voltage on the battery 0v, jump started her. Fired up first time. So ordered n new battery a Motobatt MBTX9U and a battery tender. Installed the battery and took her for a test ride.


...and she died a couple times while at stop streets while idling. But would start just fine and got her home and tested the charging system. Did put her in dealer mode and got C13 and C22 code. Check the IAP sensor - unplugged and cleaned and fault code gone started her up and she still dies when I give it a small rev and jump off the throttle...will a bad regulator cause this or should I be worried

Regulator: OK

Stator:

That's on all 3 windings

The manual I have says resistance should be between 0.2 - 0.9 ohm, is that correct
 

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What is the charging voltage at the battery? If it is 14.0-15.5 VDC then everything on the charging system is fine.
 

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1983 Yamaha XT500, 1999 GSXR750 FI, 1995 Yamaha XT600, 2006 GSXR 750, 2005 GSR600, 2005 GSXR750
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14 Posts
Discussion Starter · #14 ·
@rv6john
When I checked it with the bike cold was 14v, but when the bike warms up 13.1v at5000 rpm.

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1983 Yamaha XT500, 1999 GSXR750 FI, 1995 Yamaha XT600, 2006 GSXR 750, 2005 GSR600, 2005 GSXR750
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14 Posts
Discussion Starter · #15 ·
Update
My stator and AP sensor arrived today, so install my AP sensor (waiting in installing stator for now) feels alot smoother and stable. Might just be because when I got the bike there was no AP sensor installed at all, STVA was not functioning and the STVA butterflies where removed...I replaced all of it with junk yard parts,

other things i have done
replaced the oil with Castrol Edge, OEM filter. Adjusted the clutch per OEM manual. Replaced the battery with a MotoBatt.
Replace old tyres with Pirelli Angel ST

Still to do:
replace spark plugs
replace chain DID VX
replace rear brake pads, thinking SBS Sintered
Check shims
And replace cam chain tensioner
Clean and refurbish the fuel system, bike had me walk yesterday - no fuel. Fuel light never came on.
Replace wheel bearings, OEM - just waiting on last couple of seals from Dealer.
Gel seat

Maybe add some clipon risers

Replace shorty exhaust with K6 750 system just like the look.

Then she should be ready for a road trip, want to put some real miles on her in the saddle. Relatively low miles for a bike her age 33514km/20824miles asof now.


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