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Messages - CR750
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1
« on: January 10, 2019, 03:27:07 PM »
Matt Harper is a great guy really helpful, he sent me some bits for my carbs for free he is one of the best you can deal with...you get what you pay for at the end of the day...OK if you have got your own gear & know what you are doing that's great but not everyone is that hands on or that fortunate to have all the gear.....also dont forget the old adage "all the gear but no idea"... 
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« on: January 08, 2019, 08:46:47 PM »
Been having starting problems and flipped a carb bowl off to have a peak and it was pretty gummy and lots of sediment.
Can anybody recommend a carb cleaning specialists. In South Cheshire area but distance doesn't really matter.
here you are sir & on your door step:- Matt Harper, Hollybush Crescent Willaston Nantwich, Cheshire CW5 6PP 0775 200 8698 https://m.harpers-ultrasonic.com/
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« on: January 05, 2019, 02:22:43 PM »
I can see the fuel pipe in the photo but not the vessel its out of shot but I do see what you mean now , did you strip & clean the carbs after the long lay up ?
/... did you strip & clean the carbs after the long lay-up & before this start up
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« on: January 04, 2019, 06:44:57 PM »
Hi Folks,
Well, after two weeks (with Christmas and New Year in between) of cleaning and preparing the K1 for its first start-up after a 3 year lay-up, so after priming the oil pump and filter it actually started on the first press of the button. .... you were very lucky... 
https://www.youtube.com/watch?v=hb91KyFmAjI
https://www.youtube.com/watch?v=8aL1cXomjuk&t=12s
The bike looks great...nice work...But there's no fuel tank on the bike in the video where did the petrol come from & was it fresh ?
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« on: January 04, 2019, 11:50:00 AM »
If you keep the standard service items spot you should rarely need to balance carbs HOWEVER if you dont run it for 4 weeks you may have to strip them and clean all the jets and pathways.
I agree in part, you certainly have to run the engine quite often during winter lay up. I have had my CB750 for almost 5 years, it is my 1st Honda, it was completely rebuilt at the time. I have had issues with the carbs initially in my learning curve with this bike, I learned that you must keep a good quality petrol in the bike [no ethanol if possible]+ a Stabiliser, also keep the tank at least 3/4 full at all times specially during a lay-up & then during the winter period start the bike at least once a month & allow the engine to really warm up,i've never had to strip the carbs as yet I got away with occasional carb cleaner...also having the correct spark plugs is important, I now run with the NGK D7EA & all is good so far, previously tried many others including iridium
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« on: January 02, 2019, 04:30:15 PM »
How often guys do you reckon carbs need balancing ? especially PD carbs , or are they best left alone unless you know or suspect you have an out-of-balance
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« on: December 15, 2018, 10:14:30 PM »
Thanks CR750, the screws on those are on the engine side of the venturi so fuel instead of air adjustment. I was forgetting that 
No problem, these variation in carbs can be confusing.. 
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« on: December 15, 2018, 01:15:06 PM »
I've been mulling it over for a few days and feel that you can try to move it a little richer without having to change the jets.
Nearly all carbs have got some adjustment available to take into account temp and altitude variations, they are supplied to general markets like ours sitting more or less in the middle of that range.
To bring up the slow speed mixture using airscrews to adjust. If you turn them in a quarter turn it should bring that mixture toward more fuel through those low response rpm.
The main jets. You can drop the circlip/raising the needle to overall bring the mixture up across the whole range from about 1/4 throttle upwards.
If you try it with the idle set first to see if you get a discernable change, then you may want to add the mains to that. This should preserve the mixture parity across the whole rpm and avoid making significant steps in the fueling gradient (ie avoiding flat spots).
On the PD carbs to make the mixture richer [more fuel] you turn the screw out not in, turning the screws in weakens the mixture on the PD carbs.
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« on: December 05, 2018, 11:34:17 AM »
[quote author=CR750 link=topic=17651.msg152447#msg152447
I had this reply from BP :- dated 2014
Thank you for your email concerning the fuel sold by BP.
In "most regions" of the UK our Ultimate Unleaded dos not contain any Ethanol at present (South West UK excluded).
This may of course change in the future as the specification allows up to 5%. If there will be any changes, these will bw shown on the pumps and at the stations.
BP ultimate will never have more than 5% ethanol until January 2017 when it could be increased to 10%
dated 2018, Shell & Ethanol. in the UK, Shell regular unleaded and Shell V-Power unleaded are likely to contain some ethanol, but it will not be present at more than 5% (in accordance with current UK specification requirements
So this contradicts your original post on ethanol percentages then. No Not Really I honestly don't think the Petrol Companies themselves are giving us the true content of ethanol in their fuel . also I do know is its a waist of time asking the petrol station attendants about ethanol content I don't think half of them will know what it is.. why don't you try contacting the petrol companies above by email or letter & see what info & figures you will get [/quote] Ask the retailer it's on their spec sheets what they receive from the distributors . I asked the girls on the tills who didn't know the content but said they would ask and took my number. A day later I got a call from Sainsbury's head office with the information. It's not a secret and I didn't pluck my figures out of thin air..... neither did i
Quote:-
I also enquired about it at our local Sainsburys petrol station last year & I was told it had at least 5% ethanol in the super unleaded. I personaly would not buy any supermarket fuel for my bikes. https://www.esso.co.uk/fuels-faqs
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« on: December 04, 2018, 08:30:11 PM »
I had this reply from BP :- dated 2014
Thank you for your email concerning the fuel sold by BP.
In "most regions" of the UK our Ultimate Unleaded dos not contain any Ethanol at present (South West UK excluded).
This may of course change in the future as the specification allows up to 5%. If there will be any changes, these will bw shown on the pumps and at the stations.
BP ultimate will never have more than 5% ethanol until January 2017 when it could be increased to 10%
dated 2018, Shell & Ethanol. in the UK, Shell regular unleaded and Shell V-Power unleaded are likely to contain some ethanol, but it will not be present at more than 5% (in accordance with current UK specification requirements
So this contradicts your original post on ethanol percentages then.
No Not Really
I honestly don't think the Petrol Companies themselves are giving us the true content of ethanol in their fuel .
also I do know is its a waist of time asking the petrol station attendants about ethanol content I don't think half of them will know what it is..
why don't you try contacting the petrol companies above by email or letter & see what info & figures you will get
11
« on: December 04, 2018, 11:34:33 AM »
I had this reply from BP :- dated 2014
Thank you for your email concerning the fuel sold by BP.
In "most regions" of the UK our Ultimate Unleaded dos not contain any Ethanol at present (South West UK excluded).
This may of course change in the future as the specification allows up to 5%. If there will be any changes, these will bw shown on the pumps and at the stations.
BP ultimate will never have more than 5% ethanol until January 2017 when it could be increased to 10%
dated 2018, Shell & Ethanol. in the UK, Shell regular unleaded and Shell V-Power unleaded are likely to contain some ethanol, but it will not be present at more than 5% (in accordance with current UK specification requirements
12
« on: December 03, 2018, 12:04:10 PM »
I use super unleaded in all my bikes to avoid the thernol related problems - until it gets put in that too!
Seemed to have sorted problem (see previous post) - duff plugs.
Glad to hear you have sorted it ! The only super unleaded that has no ethanol added is Esso Synergy Supreme, all the other brands "Shell" "BP" etc all have ethanol added, usually 10% & this is going to increase... 
13
« on: December 02, 2018, 12:02:33 PM »
I've only been putting half a gallon in at a time as I have been waiting to get the CR replica fuel tap back from the guy who makes them (as it was leaking) and knew I would need to drain the tank. I have a cr250 motocross tap on at the moment (its not a tap issue as I've had that fitted since start up).
The only problem with putting small amounts of petrol in the bike & leaving it stood for a while is that it will quickly attract moisture which will sit at the bottom of the tank & the watery fuel will be the 1st thing to fill the float bowls.. but I do understand, you will be emptying the tank to fit the new fuel tap so getting half a gallon out is much quicker than emptying a full tank.. PS.. I use Esso Synergy Supreme + 97 [ No ethanol in this, exceptions for certain areas of the UK ] https://www.esso.co.uk/fuels-faqs
14
« on: November 29, 2018, 10:08:31 PM »
How much & how long have you had the fuel in the tank ? this could be your problem
Try draining the tank & fill it right up with a good premium fuel & then add some stabiliser for winter storage, if this sorts out the problem you then need to start it up every month or so until engine is warmed up. hope this helps
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