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Search: Posts Made By: Mr.Pete
Forum: The Board 07-16-2015, 06:23 AM
Replies: 36
Views: 3,700
Posted By Mr.Pete
Re: Triumph unit 650 belt primary

I agree with Goldy.
A primary chain will wear out long before it breaks.
A belt can break and take out you primary case with it.
Forum: The Board 06-10-2015, 11:58 AM
Replies: 13
Views: 1,477
Posted By Mr.Pete
Re: sprocket advice for a pre-unit bonnie

43T sprocket/integral cast drum was available for the 3TA. I'm not sure about all wheels, but certainly the quick-detachable one.
Forum: The Board 06-09-2015, 04:36 PM
Replies: 13
Views: 1,477
Posted By Mr.Pete
Re: sprocket advice for a pre-unit bonnie

4.28:1 is still very tall.
Depending on tyre size, but with 25" tyre OD that would give 121 mph @ 7000 rpm.
The average 650 unit used 4.84:1 and made around 107 mph @ 7000 rpm.
Tall gearing...
Forum: The Board 05-31-2015, 09:51 AM
Replies: 8
Views: 1,103
Posted By Mr.Pete
Re: T100C top rebuild problem

You don't even have to remove the camwheel nuts, to find where the key is pointing to.
The key is inline with the centre of one cam lobe, and it's the drive side lobe.
Forum: The Board 05-31-2015, 07:33 AM
Replies: 8
Views: 1,103
Posted By Mr.Pete
Re: T100C top rebuild problem

You can never say they're set correctly, just by looking at the dots.
What's there does appear to be factory timing, PROVIDIED the keyway on the cam is fitted in the camwheel keyways closest to the...
Forum: The Board 05-05-2015, 12:10 PM
Replies: 11
Views: 4,123
Posted By Mr.Pete
Re: triumph crank balancing

Unlike some engines, it's impossible to have a parallel twin or a single completely balanced during a full rotation of the engine.
With zero balance factor, it would be balanced at around...
Forum: The Board 05-05-2015, 10:56 AM
Replies: 11
Views: 4,123
Posted By Mr.Pete
Re: triumph crank balancing

I don't know anyone who'd recommend 60% on a Triumph 650 or 750 twin.
It's a good idea to keep away from balancing shops that mainly do car engines, or even Harley engines. Those engines require...
Forum: The Board 05-05-2015, 02:32 AM
Replies: 6
Views: 905
Posted By Mr.Pete
Re: Swapping up a T100 Exhaust cam without splitting case?

You don't even have to touch the head or remove it. Take off the exhaust rocker box.
With both tappets down (like they should have been when you remove the rocker box) jam something in between the...
Forum: The Board 05-05-2015, 02:17 AM
Replies: 11
Views: 4,123
Posted By Mr.Pete
Re: triumph crank balancing

Many people claim that the balance factor doesn't matter much, as long as it's somewhere between 65% and 85%.
Dry frames (up to '70 model) used 85%.
A T140 in an OIF frame uses 74%, according to...
Forum: The Board 05-03-2015, 10:21 PM
Replies: 4
Views: 806
Posted By Mr.Pete
Re: oil at exaust

Badly fitting valve guides are more likely to be the problem than worn valve guides with too much stem clearance.
You could have a loose guide, that moves in the head.
Someone could have damaged...
Forum: The Board 05-01-2015, 04:53 PM
Replies: 3
Views: 940
Posted By Mr.Pete
Re: Triumph 650 2 Piece Crank

In Australia, it would be almost impossible to buy allen headed bolts that aren't super high tensile.
Forum: The Board 04-24-2015, 10:21 PM
Replies: 14
Views: 1,698
Posted By Mr.Pete
Re: running engines in "for beginners "

I think this is worth a read.
http://www.mototuneusa.com/break_in_secrets.htm

I'd be a little more aggressive than Motoman at the start. He waits around for the engine to warm up. I'd have it in...
Forum: The Board 04-24-2015, 05:45 PM
Replies: 2
Views: 876
Posted By Mr.Pete
Re: any ideas on head bolts for 750 triumph

I see 4 outer head bolts with hex heads. A washer fits under the head of each bolt. Very normal, with no excess bolt length above the head.

I see 4 inner 3/8" head studs, which incidentally have...
Forum: The Board 04-21-2015, 10:50 AM
Replies: 18
Views: 4,650
Posted By Mr.Pete
Re: kill switch wiring question

That won't work so well, if has a Boyer instead of points.
Forum: The Board 04-21-2015, 07:13 AM
Replies: 2
Views: 1,324
Posted By Mr.Pete
Re: T110 Bobber build - camshaft help needed

Triumph used that combination (3134 on intake) from late '50s until about '66 on 650 engines. They used it even later than that (to '69 or so ?) on some unit 500 engines.

A 3134 on the exhaust too...
Forum: The Board 04-21-2015, 04:44 AM
Replies: 18
Views: 4,650
Posted By Mr.Pete
Re: kill switch wiring question

You'll find the kill switch explained here, for both +VE ground or -VE ground.
They are different.
http://www.tioc.org/boyer/boyertestnewweb.htm
Forum: The Board 04-16-2015, 06:39 PM
Replies: 4
Views: 704
Posted By Mr.Pete
Re: Replace dual coils with single coil

I suggest you read the page in this link, before you do it.
https://www.jockeyjournal.com/forum/showthread.php?t=97484&highlight=coil+dwell
Forum: The Board 04-14-2015, 05:59 PM
Replies: 25
Views: 3,746
Posted By Mr.Pete
Re: Triumph 650 alternator rotor nut - it won't budge

What pressure do you get on a piston during combustion with full throttle?
Over 800 psi, and possibly even 1000 psi.
On 6 square inches of piston, that's about 5000 lbs of force.

If the piston...
Forum: The Board 04-13-2015, 10:47 PM
Replies: 25
Views: 3,746
Posted By Mr.Pete
Re: Triumph 650 alternator rotor nut - it won't budge

Bring the drive side cylinder to TDC on the compression stroke. Then wind the engine backward 1/4 revolution.
Fill the drive side cylinder with oil and re-fit the spark plug.
It won't move then,...
Forum: The Board 04-11-2015, 10:21 PM
Replies: 2
Views: 945
Posted By Mr.Pete
Re: Spark plug lead length

If you're using wire-cored leads, it won't be a problem. It will run as well as ever.
Forum: The Board 02-09-2015, 04:12 PM
Replies: 7
Views: 1,253
Posted By Mr.Pete
Re: What year TR6 head?

Ět's a '71 model or later head. Just take out the roll pins & you can use it with earlier rocker boxes & head bolts.
Forum: The Board 12-26-2014, 01:19 PM
Replies: 15
Views: 2,259
Posted By Mr.Pete
Re: Triumph Twin Cam Gear Puller

The camwheel threads should be the same as pre-unit. I use the same tool to fit unit or pre-unit camwheels. Your threads are butchered, and that would be causing the problem.

I can't comment much...
Forum: The Board 12-20-2014, 08:34 PM
Replies: 10
Views: 1,803
Posted By Mr.Pete
Re: Triumph 5ta engine t100 frame?

Any Triumph unit 350/500 engine will fit into any Triumph unit 350/500 frame.
I don't think you'd squeeze a magneto in where the distributor fits, but why would you even bother to try? Apart from...
Forum: The Board 12-12-2014, 10:44 AM
Replies: 47
Views: 11,227
Posted By Mr.Pete
Re: Triumph drilled timing gears...

It depends how fast you want to go.
I've done better than 130mph on a public road.
Forum: The Board 12-12-2014, 02:11 AM
Replies: 47
Views: 11,227
Posted By Mr.Pete
Re: Triumph drilled timing gears...

Total engine inertia has more effect on valve train stability than just the weight of camwheels.
When Johnny Allen set a 214.4 mph record in 1956, the crank in that Triumph engine weighed 30 lbs...
Showing results 1 to 25 of 498

 
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