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Messages - Grunt

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1
British Bikes / Re: Excelsior Universal 125cc - Rear Plunger
« on: April 15, 2019, 12:34:30 PM »
Iíve been reading this thread on and off as it has progressed, I have had absolutely no experience of plunger type suspension. What is confusing me is that unless Iíve missed it no one has mentioned spring compressors. Ive no idea what the cost but they are fairly easy to make from lumps of ally  and stud iron.

2
British Bikes / Re: Triumph T120 engine number
« on: April 06, 2019, 12:41:52 PM »
Does the frame have the earlier higher seat loop or the lower type and what style seat catch has it got, the over centre clip or the plunger? Both will give a vague indication of frame year if your doubtful of the number, as will the coil mounting under the seat.

3
British Bikes / Re: Fuel tank liner.
« on: March 28, 2019, 08:22:20 AM »
Thanks for the reply Mike, unfortunately I canít find it in the UK though the website does say what itís made from, ďPhenol Novolacď so Iíll do a bit of research on that.

4
Autojumble / Re: 350 cc side valve JAP engine parts needed
« on: March 02, 2019, 08:04:46 AM »
Unfortunately I have to agree, making one out of mild steel or brass would be slightly easier but still involve a fair bit of organisation before any machining was done. Another problem would be that to ensure a good fit of the nut, whoever makes one would Be better off having an exhaust stub to use as a gauge.

5
Autojumble / Re: 350 cc side valve JAP engine parts needed
« on: February 28, 2019, 09:03:21 PM »
Is this the one
http://www.vintage-motorcycle.com/index.php?language=en&site=4&pid=24&id=26427&limit=0
If so then it probably is a 2Ē dia thread.

6
Autojumble / Re: 350 cc side valve JAP engine parts needed
« on: February 28, 2019, 08:04:12 AM »
Quote
I read on another forum that  it is 2" 20tpi ,not sure if that's correct
2Ē x20 TPI is possible though I somehow think itís a little on the large side.

7
Autojumble / Re: 350 cc side valve JAP engine parts needed
« on: February 27, 2019, 08:25:50 AM »
Quote
,i m still looking for a nut for the exhaust !
Do you have the dimensions, particularly the thread form.

8
British Bikes / Re: Rocket Three oil return
« on: February 10, 2019, 09:25:58 AM »
Iíve looked at both forums occasionally but I cant get on with them. Thereís too much going on on the iPad screen, if a wayward bit of hand brushes the wrong part of the screen you could find youíve married someone from Latvia, male or female! Not that thereís anything wrong with Latvians, male or female. Itís just that the current Mrs Grunt might not be best pleased.

I think Iíll join the Trident and Rocket Three owners club.

9
British Bikes / Re: Rocket Three oil return
« on: February 09, 2019, 01:20:51 PM »
Thanks for the replies.

Thatís what Iím basing my assumptions on and would have made it the same size as my oil in frame Bonnie but the Rocket Three feed and return pipes are bigger. I also have to take into account the Rocket Three has its oil cooler after the rocker feed take off which will create some back pressure. I sure Iím thinking too much into it but would like to have a definitive answer.

10
British Bikes / Rocket Three oil return
« on: February 09, 2019, 12:25:56 PM »
I am currently rebuilding my Featherbed framed Rocket Three.

I never did like the way the original builder made the oil return into the tank and want to alter it so the flow of oil can be seen and is above the oil high level point.

Iím assuming that in order to create back pressure so the rocker feed gets an acceptable amount of oil that the exit hole of the return pipe is smaller than the 7/16Ē bore of the hose. Does anyone agree and if so can anyone tell me the diameter of the hole or size of tube in the original oil tank.

11
British Bikes / Re: Triumph TR 250 1971
« on: February 04, 2019, 01:16:38 AM »
Going down the worlds your oyster route Iíd be checking fuel flow, i.e. blocked filters, air hole in the tank cap big enough not to create a vaccuum. Thereís a saying about electrical faults being fuel faults and fuel faults being electrical, or was it rear wheel problems being front wheel problems, canít remember now.

12
British Bikes / Re: Fuel tank liner.
« on: January 28, 2019, 07:15:14 PM »
I want to do the tractor tank just in case there are some holes still waiting to be discovered. Both the bike tanks are sound, I didnít realise it was just the fact that ethanol attracted water which caused the problems. So I shanít do anything with them.

13
British Bikes / Re: Fuel tank liner.
« on: January 28, 2019, 12:51:53 AM »
Thanks for the replies. It seems that Petseal has been the main reason that chemical liners have got a bad name.

How much does anyone believe the manufacturers of the chemical liners claims that the ethanol based fuels will attack just about any fuel tank known to mankind. It doesnít ring true to me that fuel manufacturers would be allowed to sell something that is likely to destroy a fuel tank to the extent that some would have us believe.

14
British Bikes / Fuel tank liner.
« on: January 27, 2019, 09:39:13 AM »
Has anyone used a fuel tank liner they can personally recommend. There are quite a few about and even more horror stories, a lot of which Iím sure are the usual repeated friend of a mates neighbour stories.

I want to do a tractor diesel tank, Iíve soldered the holes, pressure tested it and swilled petrol round in it. There are no obvious leaks but would like to take a belt and braces attitude. Iíve also considered doing my Bonnie and ally featherbed tank.


15
British Bikes / Re: 66 Bonneville T120
« on: January 04, 2019, 09:19:47 AM »
Have a look here for as much carb information as you are likely to need.

http://www.jba.bc.ca/Bushmans%20Carb%20Tuning.html

He states that a .106 needle jet is .106Ē diameter which is the size of a number 36 drill, I can verify this having checked a new set bought last year from Amal. However not everyone has a set of number drills, so you if youíre in any doubt jets arenít that expensive so why not replace them as a matter of course.

As far as valve clearances are concerned why bother setting them tight or slack when itís just as easy  to set them correctly. I dunno if youíve come across the tip for setting them by winding them down onto the valve tip by hand and then backing them off. You will have to determine what thread pitch the adjusters are, I would guess yours are CEI, then working out how much of a turn gives you 0.004. This is a particularly good way of setting valve clearances if the valve tips are worn.

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