Shim help for a 84 gpz 1100

Hi guys, I got the head back from the shop today but the gaps have changed again could some one help with finding the correct shim for this head.I would have played around with it until I dialed it in but inorder to replace the shims for another I have to drive 1 and a half hours to the bike shop to exchange them.

# 1 INTAKE GAP= 0.55mm

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SHIM=2.00mm
#2 INTAKE GAP= 0.40mm

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SHIM=2.20mm
#3 INTAKE GAP= 0.30mm

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SHIM=2.15mm
#4 INTAKE GAP= 0.40mm

---

SHIM =2.00mm

#1EXHAUST GAP=0.25mm

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SHIM=2.00mm
#2EXHAUST GAP=0.30mm

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SHIM=2.10mm
#3EXHAUST GAP=0.30mm

---

SHIM=2.10mm
#4EXHAUST GAP=0.40mm

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SHIM=2.20mm

I'm looking for a 13mm gap ??? for all

man-of-war wrote: Hi guys, I got the head back from the shop today but the gaps have changed again could some one help with finding the correct shim for this head.I would have played around with it until I dialed it in but inorder to replace the shims for another I have to drive 1 and a half hours to the bike shop to exchange them.

# 1 INTAKE GAP= 0.55mm

---

SHIM=2.00mm =240
#2 INTAKE GAP= 0.40mm

---

SHIM=2.20mm =245
#3 INTAKE GAP= 0.30mm

---

SHIM=2.15mm =230
#4 INTAKE GAP= 0.40mm

---

SHIM =2.00mm =225

#1EXHAUST GAP=0.25mm

---

SHIM=2.00mm =210
#2EXHAUST GAP=0.30mm

---

SHIM=2.10mm =225
#3EXHAUST GAP=0.30mm

---

SHIM=2.10mm =225
#4EXHAUST GAP=0.40mm

---

SHIM=2.20mm =245

I'm looking for a 13mm gap ??? for all

Add shim size fitted to current gap size and deduct gap required (this case.15mm) gives you shim required.
Factory quoted maximum is .15mm which is the gap i have quoted for.
I wouldn't go below .10mm

# 1 INTAKE GAP= 0.55mm

---

SHIM=2.00mm =240
#2 INTAKE GAP= 0.40mm

---

SHIM=2.20mm =245
#3 INTAKE GAP= 0.30mm

---

SHIM=2.15mm =230
#4 INTAKE GAP= 0.40mm

---

SHIM =2.00mm =225

#1EXHAUST GAP=0.25mm

---

SHIM=2.00mm =210
#2EXHAUST GAP=0.30mm

---

SHIM=2.10mm =225
#3EXHAUST GAP=0.30mm

---

SHIM=2.10mm =225
#4EXHAUST GAP=0.40mm

---

SHIM=2.20mm =245

I'm looking for a 13mm gap ??? for all[/quote]

Add shim size fitted to current gap size and deduct gap required (this case.15mm) gives you shim required.
Factory quoted maximum is .15mm which is the gap i have quoted for.
I wouldn't go below .10mm[/quote]


this is what I got for the valve clearance

# 1 INTAKE GAP= 0.18mm

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SHIM=2.45mm
#2 INTAKE GAP= 0.14mm

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SHIM=2.50mm
#3 INTAKE GAP= 0.15mm

---

SHIM=2.30mm
#4 INTAKE GAP= 0.16mm

---

SHIM =2.25mm

#1EXHAUST GAP=0.16mm

---

SHIM=2.10mm
#2EXHAUST GAP=0.15mm

---

SHIM=2.25mm
#3EXHAUST GAP=0.13mm

---

SHIM=2.25mm
#4EXHAUST GAP=0.16mm

---

SHIM=2.55mm

I'm done with this valve adjustment for now.I had to take the head to the shop twice yesterday for heli coils.#1 Intake bothers me,but it's in spec.

You can get that 1 intake to .13mm with a 250 shim.
But running .18mm isn't unheard of on fast road/race motors.
Those low area 200 shims would be worth rectifying now though and save the expense of a further top end strip in the near future due to lack of adjustment.

zed1015 wrote: You can get that 1 intake to .13mm with a 250 shim.
But running .18mm isn't unheard of on fast road/race motors.
Those low area 200 shims would be worth rectifying now though and save the expense of a further top end strip in the near future due to lack of adjustment.

ZED,

Which shims should I address and what size shim should I use.

I fired her up today, sounds awesome. The first 10 minutes of riding I had to adjust and re-adjust the idle screw. I take it the engine was too tight and was freeing itself.....

It idles better now. Is there any way to fine tune this engine? I do have a timing light. The reason is that when I'm gearing down I can hear a poping noise from the exhaust.... Almost like a mild backfire. THIS IS A VIDEO MY SON MADE WHEN i TOOK HIM FOR A RIDE AROUND THE BLOCK.




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You ought to get the throttle bodies balanced and strobe the ignition now that you've given it a run.
Re-check the shims and try to get them as close to 0.15mm as you can.
Popping exhaust could be a few things. Valve not seating, excess fuel burning in the pipe, Air leak on the exhaust,wrong fuel mixture,
Get the intakes balanced and timing spot on first then give it a run and check plug colour.