Question about 2 stroke throttle to rpm relation
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also on the oil pump front. there are mixed views on their reliability but if rebuilt and the bike is looked after it makes it far more efficuent. i know a guy on the 350 ypvs forum who rebuilds them. im probably getting mine done on the dt engine im doing atm.
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I wonder on the opposite side of things if it's possible for the pump to fail and cause over oiling? A friend of mine says his DT keeps overheating and I reckon it could be too much oil if his coolant is fine.
@MIGHTYMAN Whilst it is true fuel cools the piston down, and throwing that ratio out will affect its heat.
Over oiling will reduce friction in the engine, reducing temps.
So not convinced on that idea.
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Too much oil though definetly makes heat.. I can't remember the exact explanation but it's something to do with the oil changing the octane levels? My 250 EXC seized when i stupidly put twice the oil ratio into a mix of petrol.
@MIGHTYMAN Like I said, that's due to the dilution of petrol, not necessarily the addition of oil.
For example, KTM EXC 250 Two Stroke.
Pre mix oil and fuel, dilutes the petrol mixture.
DT125R, with oil pump, adjust the oil pump to max settings and the fueling stays the same.
That's in response to your friends over heating problem.
Other possibilities are contaminents in the Coolant system reducing the specific heat capacity of the coolant, increases temps.
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Well not much progress today, swingarm is still stuck in the bike ,but i managed to free it from the bolt itself now the swingarm can move without the bolt turning with it , it is stuck on the washers near the head of the bolt
according to this pictue, on one of those parts 7,9,5
Fixed a few wires and cleaned connectors on the wiring loom.
What do you guys do when the loom becomes stiff - every wire on mine has insuliaton like hard plastic? -
good photos. love the bit of wood to block the oil pump cable.
the carb you need is a vhsa 32mm. i do have one for sale. if ypure interested i can get photos.
agree with cal on the copper mallet. wd40 is good but a specific penetrating oil would probaby be better. screwfix were doing big cans of no nonsense for £3 recently. if you still cant get it shifted then a heat gun on the end might help break it free. just be careful of seals etc unless you plan to replace them anyway.
swing arm rebuilds are costly though so only do if needed and remember to grease it all well and keep ut greased using the nipples.
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@ramekenas £60 delivered.
So what is the problem with the swing arm? I'm confused as to how its stuck? the pivot bolt is out now?
Diesel, coca cola or penetrating oil and then a heat gun is still my best advice.
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@ramekenas £60 delivered.
So what is the problem with the swing arm? I'm confused as to how its stuck? the pivot bolt is out now?
Diesel, coca cola or penetrating oil and then a heat gun is still my best advice.
@AndyYam
Well i tried to take the bolt out for 4 days and nothing happened ,only on day 3 did hear the bearings crunching in there , it is rusted solid and a multiple ton press is required or something like that, i even took a rotary hammer and tried to hammer it out to no avail. The oil fittings in the swingarm look like they never been used you can't see shiny metal there at all, so out of pure despair put the bloody thing back together and filtered the oil and it stopped whining , i have a feeling its clutch plates + dirty oil.
I changed the oil at the beginning of this season but it was grey-ish all ready looks like the gearbox won't last to long. I thought about it and decided if i can make it running for the rest of this season i will so i could clean up the garage get some tools some books/manuals, and do everything properly during the winter because i need the bike to repair the bike catch 22.
