Skip to main content

Honda CB750

So, while I get the Z750 back on the road I'm using my backup bike. its a 1982 Honda CB750 imported from Japan in 1999. I've had it since 2010 and it's been off the road more than on since then. it needed a new exhaust, and I just didn't make the time to get it fixed, so that kept it garaged for a few years.

but it's all up and running now (well, sort of). I was riding it to work a few weeks ago, and all was fine, but on the way home, it started to play up. I'm not sure how to describe it really. I was using a steady throttle doing about 65 (it is an old bike) when all of a sudden it started to feel like the breaks were being pumped on and off fairly quickly. I pulled in the clutch and let it coast and it was fine. that ruled out the breaks to me.

this went on for a couple of miles, and then it cleared up and was fine again.

when I got home, i did what you always do when you have problems - I Googled it. Some of the results pointed to HT leads, and as it had been raining and then dried up during the ride home, I felt that this was the probable cause. off to david silver where I ordered new HT leads, new spark plugs and new spark plug caps.

it took a couple of weeks for the HT leads to be in stock, but they eventually arrived. It's still amazing to me that we are all getting so impatient. it's not that long ago that any mail order would have been 4 weeks for delivery, but these days next day delivery is considered slow !!

anyway, the leads arrived, and one by one I put the new leads and plugs onto the CB750. I did this one at a time so that I didn't get the plugs connected to the wrong connector on the coils. so it was take off cylinder 1 spark plug and HT lead, fit the new plug cap onto the lead and fit to the bike. new plug in and connect it up

onto cylinder number 2. and yes you guessed it. stuck fast. Oh F***. what to do now? 

well after the panic subsided, I made sure that I had a really good fitting spark plug socket on it and tried again with a bit more force, and what do you know. it turned. but boy was it corroded in there, I needed to use the socket until it was all the way out. the threads were covered in rust. I tried to get the crap out of the way of the plug hole, but didn't want to do too much as getting crap into the engine s very easy when there is a great big hole directly into the cylinder.

well, at least it was out. new HT lead, plug cap and plug back onto the bike.
I got lucky with the last two cylinders as they were fine, but I'm really going to need to keep an eye on cylinder 2.

so, it's back on the road and now it runs...... just as badly as before.

after about 10 minutes of riding, it starts playing up and then after about a minute, it cleared up again. sod it!

so now, I'm guessing it's a fuel delivery issue. I don't think it's the carbs as I would guess that it would always play up, so I'll put an inline fuel filter on it and see if that helps.
and until I get that filter, its fingers crossed whilst riding it.
Labels:

Comments

Post a Comment

Popular posts from this blog

Windows Subsystem for Linux Internals

Background Windows Subsystem for Linux was developed by Microsoft to enable command line programs compiled for the Linux operating system to be executed on Windows. To explain the architecture I would like to show the evolution of OS design and how that has enabled this subsystem to be built. Dark Ages (or Back in the Day) Microsoft's MS-DOS was quite primitive in its design (compared to today's OS's). It is a single user OS that can execute one process at a time. DOS had an application programming interface to allow user programs to access some hardware in a device independent way, but only for character-based applications. This allowed applications to display graphical elements emulated with text characters as these screenshots of Microsoft word for DOS show: This is Microsoft Word version 1. To use these programs you had to remember key combinations to bring up the menus and used the cursor keys to navigate around the screen. If the a...
Post a Comment
Read more

First race of 2019

As I am aiming for a middle distance triathlon in September, I want to make sure that I can complete it before shelling out the (rather high) entry fee. my main concern is that my knees cope with the run section which will be 21 Km (a half marathon). In the past, I have had a bit of trouble with my knees playing up. I thought it was because I had run too much (increased my training too quickly, too many races close together, that sort of thing). So for the last 8 months, I have been trying to acclimatise my knees by running around 5km three times a week To take stock of how my knees are with running, I decided to enter a 10K race. The race I entered was the Bristol Race For Chocolate 10K. It sounded like a fun race and was on 27th January, which would give me plenty of time to train for my main race in September. I wanted a 10K as it is just under half the distance of my target middle distance and if my knees cope with that then I have plenty of time to increase the distance...
Post a Comment
Read more

Project Z750 part 11

So, I thought loosening bolts ready to take things off would be a good idea? Right, So now i look down and realise that I've loosened the front brake caliper bolts a little too much and I'm standing in a small pool of brake fluid. bugger. is there enough left to push the pistons out? guess i'll find out soon enough. so i take the right hand caliper off the bike, remove the pad pin r-clip and pad pin. the pad come out and i press the brake lever. yes the pistons are moving out. now i know what your thinking, but no I didn't just push them all the way out. i put a small piece of wood in to keep the pistons in and moved onto the left hand caliper. same thing here, remove the pad pin r-clip, pad pin and pads. then pump the lever. oh fiddlesticks, not enough fluid left to move these pistons at all. great, not i have to get some brake fluid, fill it a bit just to get the pistons out. I don't want to use any other fluid as it might contaminate the brake system, and I...
Post a Comment
Read more