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Messages - TT5 Matt

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1
For Sale / Re: Shed clear out YZ & IT bikes/projects/parts & stuff
« on: Yesterday at 09:56:59 PM »
Mark those dt360a motors should nearly go in the yz400d frame with only needing the front engine mount plates rejigging though the carb will need work

2
Tech Talk / Re: Not even a Fart
« on: May 13, 2019, 06:45:40 PM »
good you found the problem,as to reed valve yam engines running with the piston back the front yes they do but judging on the dt400 I brought that a farmer did his own rebuild on it suffered a lot of crankcase backfires due to wanting to suck in still burning exhaust gas when the piston was near t.d.c uncovering the windows in the piston skirt and would have pumped a lot of fresh charge out of the same piston windows on the way down

3
Tech Talk / Re: Not even a Fart
« on: May 12, 2019, 11:24:56 PM »
check to see your flywheel keys not sheared.most motors even if way down on comp go with start you bastard but only if the timing is near where it needs to be and check the pipe for wasp nest as had that beforeon a suzi 80cc scotter and they don't even think about firing as no air out equals no air in

4
General Discussion / Re: OZVMX - History / What year did it start ?
« on: May 10, 2019, 09:47:55 PM »
yeah I liked Doc's elbow grease/polish/rattle can resto's,he made a old bike look like new again for little money and easy to repair if you damaged the paint job by riding it which is what bikes are for, not shed queen's your not game to ride in fear of pitting that power coated frame.

I also miss the threads like whever the rm125b was legal to race with a factory alloy swingarm,30 something pages of it and most of those guys are not on here anymore which is a shame coz they had a lot of good input into the forum

5
Tech Talk / Re: Looking for ER185 Advice
« on: May 06, 2019, 01:56:04 PM »
yeah Pokey's right about the crank seal on the gearbox side and another place the gearbox oil can enter is via the centre case gasket which is a bigger job to do, while your in there replace the kick start pawl

6
Tech Talk / Re: Who can share 250 pp port timing maps?
« on: April 30, 2019, 07:55:42 PM »
John send Cooper man Betric on here a PM if hes still around,250mx Coopers that used an dt1mx piston had different port maps in their workshop manual for expert racers and they might have 1 you like.id send you a copy of the workshop manual I got off him but its on my farm and not sure when ill get there next

7
Tech Talk / Re: So what is the story with lowering transfer ports?
« on: April 20, 2019, 03:21:58 PM »
I might be wrong but that would cause a lot of turbalance when going across the piston crown as transfer ducts are angled up to the combustion chamber to rid the c/chamber down of exhaust gas and charge the cylinder full of fresh air/fuel mix,sure you might drop a tad of piston crown temp but at a cost.maybe Lozza can chime in since he's more of a 2t specialist.

8
Tech Talk / Re: Hi -Low speed suspension for VMX
« on: April 16, 2019, 11:34:08 PM »
the link doesn't work

9
Wanted / Re: Exhaust for a 73/74/75 CR125
« on: April 10, 2019, 11:00:23 AM »
ive got a stock pipe,not pretty but good for a race pipe

10
Tech Talk / Re: Your thoughts on a carburation matter?
« on: April 01, 2019, 10:24:56 AM »
this is an interesting subject!so what happens if you introduce more air by say loosening a inlet manifold bolt/s?not that you would want that as a good way to stuff/dust a motor but to see what effect is has if any.are after market reed valves allow in the class your going to race it in?might be a way of calming down radical port timing.i remember old member Johney O say saying a reed valve kit helped his piston port cr250 which had an light switch power band

11
General Discussion / Re: M Oil in 1970s: Who made it?
« on: March 26, 2019, 10:23:37 PM »
after gumming up the rings on my 79 cr250 with castrol r30 a mate with an it175 and an 2 valve jawa speedway bike said to use shell m so I used it on the cr and then later on my jawa 4 valve long tracker with no gumming or any other problems,also easy to clean off with degreaser

12
Vintage Track / Re: XT500, de rake? Better turning?
« on: March 15, 2019, 09:11:41 PM »
if you derake it youll need to lengthen or replace the swingarm for something longer.a klx swinger that's 1.5 inches longer goes in with not to much work and the distance from the pivit to shocks mounts is the same as the std xt swinger but youll need heavier springs/dampening

13
Yamaha / Re: Yam clutch spring specs- 90501-20122 & 90501-20124 ?
« on: March 03, 2019, 10:53:36 PM »
the rt1 being 360cc would be the stronger springs you would think.on my bombed out tt500 which had a few different cams in it over the years I used stock springs and never had any slip despite the shite it got often

14
Bike Talk / Re: Pre 90's
« on: February 12, 2019, 04:18:17 PM »
xr400's came out in 95 maybe 96,klr250's are great farm bikes but lack decent suspension for anything serious and the front disc lacks stopping power but looks the part,tt250's watchout for the fibre oil pump drive which doesn't like heat (yam dealer here kept them in stock).if it was me id go for a xr600 again,plenty of suspension/powerfull front disc brake and all the power you'd ever need and easy to get more

15
Wanted / Re: IT 175 G/H crankshaft
« on: February 06, 2019, 11:34:50 PM »
old boss got an cr125 crank repaired by metal spaying the crank and got it ground back to size but arnt the yz125gh cranks the same as the IT?

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