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Author: zed1015
Mon Jun 24, 2019 11:42 am
Forum: Bike Help
Topic: Z900 stumble just off idle
Replies: 3
Views: 114

Re: Z900 stumble just off idle

I think Allens performance should sell the pilots or someone on the forum may have the size you will need.
Apart from getting blocked they don't wear out so s/h ones will be good enough.
Author: zed1015
Sun Jun 23, 2019 7:44 pm
Forum: Bike Help
Topic: Z900 stumble just off idle
Replies: 3
Views: 114

Re: Z900 stumble just off idle

Ride the bike and feather the choke at the flat spot to see if that smooths it out. Do it in a high gear 4th/5th as this is where you will feel the difference. If it does you are still slightly lean coming off the pilot and richening on the air screw by 1/8 to 1/4 turn should do the trick. You could...
Author: zed1015
Tue Jun 18, 2019 8:05 am
Forum: Bike Help
Topic: Exhaust drilling
Replies: 3
Views: 173

Re: Exhaust drilling

Tap them M10 and plug them with grub screws.
Author: zed1015
Sat Jun 15, 2019 10:03 am
Forum: Bike Help
Topic: Head Bolts
Replies: 3
Views: 184

Re: Head Bolts

Quick fix is to use a longer bolt with a nut between the barrel fins as already mentioned. They can be helicoiled in situ but there is a slight chance that the hollow steel dowel will rotate when tapping so go slowly backing off half a cut at a time with plenty of cutting lube. The dowel is "so...
Author: zed1015
Thu Jun 13, 2019 4:04 pm
Forum: Bike Help
Topic: Jet sizes
Replies: 1
Views: 88

Re: Jet sizes

Is this a pattern 4-4 as there is a batch that is very restrictive which makes the power gutless from around 3500rpm and drops top speed to not much above 75/80 mph. As for jetting a good 4-4 should not make much difference or slightly improve performance over the 4-2 and would suggest going very sl...
Author: zed1015
Wed Jun 12, 2019 1:52 pm
Forum: Bike Help
Topic: KZ1000 MkII (A3, 1979) aftermarket carb sizing advice
Replies: 11
Views: 264

Re: KZ1000 MkII (A3, 1979) aftermarket carb sizing advice

The problem I have is the original carbs to the bike have been sold. My concern is finding a correct, decent set of VM28ss's with the pumper/enrichment circuit in perfect operating order without an off-idle stumble. The last MkII VM28ss carbs I did were a total nightmare - I probably sank ~ 20-25 h...
Author: zed1015
Wed Jun 12, 2019 10:01 am
Forum: Bike Help
Topic: KZ1000 MkII (A3, 1979) aftermarket carb sizing advice
Replies: 11
Views: 264

Re: KZ1000 MkII (A3, 1979) aftermarket carb sizing advice

The stock 28mm carbs are plenty for a stock motor and exhaust and still give good results even with a port job and open pipe etc. 34mm slide carbs are overkill and really the largest you would need for any state of road tune. If going for a 4-1 pipe, cams and pods etc at a later date then 29 or 31 s...
Author: zed1015
Mon Jun 10, 2019 2:58 pm
Forum: Bike Help
Topic: Carb Jetting
Replies: 8
Views: 240

Re: Carb Jetting

Usual range is 1-1/4 to 1-3/4 so you are not too far out at 2 turns but this shows you may be a little rich on the pilot and may need to go back to the 15 and retune the air screws down a little. The main thing is having the mix ratio correct which you probably have at 2 turns with that 17.5. As lon...
Author: zed1015
Sun Jun 09, 2019 5:17 pm
Forum: Bike Help
Topic: Carbs still leaking !
Replies: 15
Views: 533

Re: Carbs still leaking !

If it's only on the side stand it's the bowl gaskets wicking due to the material they have used for them. Try coating the gaskets with grease on install. That usually seals the surface and does the trick. If that fails it could be the bowls are warped due to overtightening and only nipping up on the...
Author: zed1015
Tue Jun 04, 2019 3:21 pm
Forum: Bike Help
Topic: Z1-R Swingarm spindle size and possibly wanted.
Replies: 6
Views: 143

Re: Z1-R Swingarm spindle size and possibly wanted.

Stock frame is average 234mm to 235mm inside width unsprung for swingarm and 304mm outside width at the s/a spindle so you need that plus 20mm or so for threads and nut.
Author: zed1015
Tue Jun 04, 2019 2:00 pm
Forum: Bike Help
Topic: Z1-R Swingarm spindle size and possibly wanted.
Replies: 6
Views: 143

Re: Z1-R Swingarm spindle size and possibly wanted.

Swingarm spindle is 16mm ( although they actually measure 15.8mm )
Think you may mean the wheel spindle though ?
Author: zed1015
Fri May 31, 2019 5:29 pm
Forum: Bike Help
Topic: Checking Valve shims
Replies: 60
Views: 44567

Re: Checking Valve shims

Slightly wider won't hurt them. Yoshi cams run 0.20mm. I always aim for 0.15 on a shim check and will go to 0.17mm if it's a choice between that and 0.12mm. Been running my Z1R for 20 years at those clearances and it doesn't hammer the valves like the scaremongers profess. 0.19mm may be up there for...
Author: zed1015
Fri May 31, 2019 1:44 pm
Forum: Bike Help
Topic: Z900-A4 engine issue
Replies: 2
Views: 139

Re: Z900-A4 engine issue

Simple things first off the top of my head.
Check for sticking/frayed throttle cables, not enough slack or binding throttle grip.
Ignition advancer sticking /springs stretched.
Valve clearances closed up.
Author: zed1015
Fri May 31, 2019 7:01 am
Forum: For Sale
Topic: 1075 pistons....now sold
Replies: 5
Views: 289

Re: 1075 pistons

8 Valve Mark wrote:hi chris, obviously 2nd dibs; are they cast or forged pistons? cheers m..

They are forged Wiseco's.
10.25 -1 comp.
Author: zed1015
Thu May 30, 2019 10:36 pm
Forum: Bike Help
Topic: Gear selector...
Replies: 3
Views: 143

Re: Gear selector...

Correct.
There are 3 ball bearings that lock out all the other gears until they are disengaged by centrifugal force.
If you spin the output shaft quick enough you should be able to get the other gears.
It's easier to do if the engine is on it's side and the shafts are vertical.

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