Cynic

The cost of getting it welded professionally unless its your Dad/Brother/Sister/Friend will be more than a new pipe so fit the proper performance part and keep the original for when you sell it.

2K4-024009 DT 175 MX Production code 4J4 sold 1980 to Feb 1985. Should have the Square section SW arm, oil tank on the off side, air filter nearside (in the UK) and a six wire CDI.

Right so you are riding it properly then . Why the jet change? Going up on the mains and down on the needle will just confuse things. Especially 2 sizes , whats that 10 points? The jet is shaped to supply the right fuel ratio at different throttle openings, the main jet will make it richer across the board. Dropping the needle will weaken the high end slightly but you may have made the low rpm range too weak to run properly causing it to pre ignite (pink).

First and slightly patronising question, you have got a full tank of good fuel. When you say the carb is good with new std jets. What was in it before. Have you had the tank off, could you have trapped a breather or kinked a delivery pipe. That would be my first line of attack. Removing the fairings doesent entail disturbing all that much as far as the vitals of the bike go, the main electrics live under the seat as i understand and again would not be disturbed. If it ran fine BEFORE you messed with it you must have caused the problem. If the ignition was right before then it still will be you need tools to change it, same goes for the head gasket.

First off you say you have been off smokers for quite a while, you are letting it get some revs on. If you are plodding around at 2or 3 thou then it will protest. You ideally want to be keeping the motor at around 5 tho for general knobing round town (under the powervalve but running clean) less than that and it will get messy.

Bloody hell of course its not sensible its down right outrageous. How can you even consider it...... Let me know how you get on

No thats the beauty of it, i'd stopped completely 2 foot from her door holding up the traffic behind me.

That would have given her a heart attack.

Not a chance, that stuff is to reduce the under bonet temp on souped up rice burners. The singularily most vitaly important part of a stroker is the expantion chamber, it MUST be sealed or the engine will pull air and melt the piston. You can skimp on many things but i really urge you to spend the money on a replacement pipe, or get a good quality repair.

It is better to track down a good second hand barrel ( they are out there) as the castings and port area's are better on the oem equipment. The only ones you can buy new are a pattern copy, which i personally don't think are worth the money.

As to the year of the bike it can be a 1980 and have a 2K4 prefix, Yamaha used that chassis prefix for all the monocross models from 1978 through to 1985 when the LC took over. Here is a guide to help..... Feb 1978 to the start of 1979, 2K4-000101 on, Production code 2K4 1979 only, 2K4-010101 on, Production code 2X2 1980 to 1985, 2K4-020101 on Production code 4J4

Riding home from work today i had to detour for some bits and pieces from in town. There is a car park and i was waiting at the lights looking down the street and saw a woman in a car waiting to pull out. She had looked right and was concentrating so intently on the traffic from her left she hadn't looked back. The lights changed for me and i moved off, she still hadn't looked round and was creeping foreward very slightly so i pulled up near her door as the traffic open'd and she shot out for the gap, at that point i hit the horn and i thought she was going to have a bloody heart attack. She stalled the car fcuked her gears up, a real brain melt. She said a very sinceer sorry as she finally moved off. Bet she never forgets to check for bikes again.

What exactly can be done. Boycotting won't work unless on a mass scale and thats never going to happen with the myopic sheep that most of the population can generally be described as. Truck drivers had a go at blockades and rolling stoppages, police used laws passed in an emergency vote to brake up the protests with military personell at the refinary's. Any gathering of people to protest about fuel will be shunned by people as soon as it starts to happen fuel companies trot out the "If it continues prices will have to rise" bullshit. Of course if you are part of a 'sensitive sub group' and stub your toe the government will give you thousands. So TTask, speaking as part of what seems to be a more and more totalitarian country, what can we do? Portugal is not all bad apparently...........

Curious, you have a 1979 DT175 F (US), are you sure you are reading the carb id correctly as 2H5 is closest to 2H500 fitted to the UK version of this bike you should have the ID 2N500. According to the spec's i have you should be running a 140 main jet. To all intents and purpose the bike is identical to its UK cousin bar some lighting differences. When you say it runs good just off full throttle and half to 3/4 throttle says that the needle jet is wrong in some way. Too high or in the wrong position, it should be 4 groves from the top. Also i would be looking at the choke opperation, theoretically it should barely run as it is and even worse without the air filter but you are saying it is flat. And runs better without the filter. Float height may be an issue. Plug chop thats what is needed i think, so at least we know if we are talking too rich or too lean.

Its not technically ideal, but it wont make all that much difference. Probably be a little down on pure performance and a good bit noisier but thats about it. The expansion pipe is the really critical part.

Its just lept from 107 to 113/l at Beaconsfield services on the M40 (Jct2). Diesel is even more, a nats under 115.

If it is a genuine 87 on rsp then it is supposed to have the exup, if it hasn't then chances are it may have spent time as a race bike. Trouble is you either want an exhaust WITHOUT the exup, or a working exup system. A dead exup valve will make a fabulous rocket nasty.

Go to a whelie school to learn how or save up for the damage you WILL do to your bike trying.

If you mean running without a muffler meaning the tailpipe at the back then that doesent make all that much difference, run without an expansion chamber the engine wont last 10 minutes before it destroys itsself.

Maybe the LC is geting the hump cos you are riding without it..

52p a litre for the rangy (LPG) don't forget thats ofset by averaging 12-14 to the gallon, otherwise its around 105-109 around Northampton.

I used to modify series 2 (58-62) land rovers. Its amazing the silly rules and regulations that turn up. And the exemptions that are permitted. Like, if you have a landrover with a hinged windscreen you can ignore all the wiper/washer windscreen glass requirements for the MOT as in theory it can be folded out of the way. (It still applies if you have a hardtop )

Side lights are a throw back to when the headlights were mounted more inboard near the radiator panel. They gave no indication to the width of the vehicle hence the introduction of lights at the side of the vehicle, ie sidelights. Strictly speaking these days they are parking lights but i don't know of any bike where i would want to leave the 'parking lights' on for any lenght of time with the tiny battery's and weak charging systems they have to save a gram or two.

Its simple, dont ride to Boulton.

Lighting comes under the same construction and use regs as everything else. Insofar as you can chop up a frame to make a flat tracker you can modify the lighting as long as the lights are suitable for road use and the light or combination works using a main and dipped beam. The bike in the pic's will probably have them wired to main and dip with one aimed differently to the other. You can also get twin filament bulbs, or if they are metal reflectors drill them for additional bulbs. Anything goes really, i had 2 spots on the old LC, one fog lamp, one driving lamp from the same product family so they looked the same bar the lenses. The fog lamp acted as dip and main beam kicked in the driving lamp. The parking/sidelight lamp is the only really tricky bit. Unless you have a 'open minded' MOT man you ideally need to squeeze one in even though its illegal to run on sidelights alone, a 12v LED bonded to the 'dip' reflector would be a neat soloution that wouldn't hurt the asthetics. Just search streetfightes for ideas on lighting, those lads and lasses seem to have done it all.