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Topics - ben

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FZS600 Fazer / Stutter/Misfire at high RPM

« on: 28 July 2023, 10:38:58 am »

This follows on from my post on cylinders 3&4 not firing. Managed to get those working by replacing the plug caps. Now I have a new problem!

When riding for a bit at high RPM/speed (5-10 mins at 70+ MPH), the bike starts to stutter, which will turn into a misfire if I carry on. Then after a few mins at low RPM/speed the misfire/stutter goes away.

I previouly took off the carbs and cleaned a load of gunk out of the float bowls and jets (didn't touch anything else).

Things I have tried/checked:

Checked for kinks in tank breathers and fuel line.
New fuel filter - previous one was installed backwards so couldn't see if it was blocked. It wasn't.
New sparks.
New spark caps (NGK straight) - Cut 10mm of the HT leads before installing
New (2nd hand) regulator/rectifier.
Checked coils - primary resistance out by .5 ohm, secondary resistance well in spec.

Anyone got any ideas?

FZS600 Fazer / Cylinders 3 & 4 not firing

« on: 17 July 2023, 08:37:33 pm »

I've got a misfiring fazer at the moment. Using the old hand on headers trick, it looks like 3 & 4 are not firing.

Background... The bike was sitting for about 2 years, and it was a periodically misfiring before it went into storage. When recommisioning it, I removed the carbs and cleaned a lot of gunk out of the float bowls. I also removed and cleaned the jets. When I put it back together, I found that I've now completely lost cylinders 3 and four. The headers on those cylinders are stone cold. I'm guessing I've messed something up, but I can't for the life of me figure out what.

Sparks, caps, and coils are fine. No kinks in breather tubes. I've removed the carbs again and there was fuel in the float bowls (not sure how much though).

Any ideas?

FZS600 Fazer / TPS ajustment with aftermarket speedo

« on: 05 July 2023, 02:46:22 pm »

Hi all!

I've got a poorly, misfiring, Fazer at the moment. Looking to do all the usual checks (plugs, caps, leads, coils, carb balance, etc). I'd also like to check the TPS but there is a problem... There is in aftermarket speedo/tacho unit on the bike which means I can't see any error codes, or any info from the TPS configuration mode.

Can the TPS setting become invalid after time? I took the carbs off, to give them a bit of a clean, but left the TPS on and didn't touch it. Assumed that it would be fine. The bike was working fine once, which means it was set correctly and hasn't been reset since. Is it likely that the TPS will need adjustment?

If so, can it be done with a multimeter? I've checked that the resistance is in range. And checked the varience in resistance when the throttle is open/closed. All is fine.

FZS600 Fazer / Carb Inlet Rubbers

« on: 23 June 2021, 02:58:58 pm »

Hi all,
Need to do a carb clean soon but my inlet rubbers are looking a bit cracked. There's a good chance they'll crumble/split when I take the carbs off. Going rate for a new set seems to be about £80 (https://yambits.co.uk/fzs600-fazer-carb-inlet-rubbers-p-75890.html), but there are some cheap ones on ebay for around £20. Has anyone had any luck with the cheap ones? Don't really wanna fork out £80 unless I have to.
Ta.

Introduction / Hi Everybody

« on: 17 December 2020, 03:14:52 pm »

Hi everyone.

New member here from Norfolk. I've posted a little already. Thought I should probably introduce myself. Picked up this little cafe racer/flat tracker modded '99 FZS600 not so long ago. Absolutely love the engine

Gonna be trying to connect the original speed sensor and tacho to the aftermarket speedometer soon. I can post a little howto if I manage to get it working and people would be intereted in that?

FZS600 Fazer / Front Brake MC with Flat Bars

« on: 17 December 2020, 11:08:24 am »

I purchased a modified Fazer back in September and the previous owner put flatter bars on it. The front break master cylinder reservoir is not parallel with the brake lever. This means that now, when the bike is upright, the reservoir is sloped at an angle and not parallel with the floor.

I found out the problem with this the hard way. I went to drain the brake fluid while fitting new brake hoses. Took the cap off the reservoir and got covered in brake fluid. When replacing the fluid I had to lean the bike over to make sure I could put enough in without any spilling out.

Has anyone changed to flat bars? If so, did you do anything to make the reservoir level with the floor when the bike is upright? Maybe replace it with a different one from another bike? Or are you just careful when replacing fluid and bleeding your brakes?

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