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Author Topic: STD Speed Team Doo is back for 2010  (Read 7804 times)
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Nortonist 592
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« Reply #15 on: April 06, 2010, 11:42:53 PM »

Bak189 is right.  Good ol' Castrol R40 (or Oilzall, more readily available) will keep an engine alive a lot better than regular motor oil.  And you definitely need an airflow across the engine.  I run an old Weslake in my sidecar.  It has about as many fins as a small goldfish.  I run Oilzall, an extra .0015 clearance on the piston and a lot of air over the engine.  I have two big scoops and deflectors to make sure.  It works just fine.


By weslake at 2009-09-19]
« Last Edit: April 06, 2010, 11:45:07 PM by Nortonist 592 » Logged

Get off the stove Grandad.  You're too old to be riding the range.
Bruin
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« Reply #16 on: April 06, 2010, 11:47:01 PM »

Bruin here, concerning the Honda rod stroke and length, I don't have the manual in front of me but we ran the engine 100% stock. So whatever the factory put in is what we ran.  Thanks for the oil tip.
Ed, Tuckers 250 is waiting line, I'm trying to time the BSA Lightning, get clutch plates on the B-50 and get her pit bike working. But I hope to pull her head by this weekend.
« Last Edit: April 06, 2010, 11:55:16 PM by Bruin » Logged

STD; Speed Team Doo
'82 Honda 500 APS-AF
'70 Triumph 250 MPS-PG
'71 Triumph 250 APS-PF
'70 Triumph 250 M-PG
Bruin
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« Reply #17 on: April 20, 2010, 12:46:23 PM »

Gotta love the old parts bin. I found a spare piston and cylinder in the pile that might make my repair affordable. If the wrist end of the crank isn't brutalized too much all I need to do is muck out the case. Maybe I can just reverse my wind shedding cowling and make it into a wind gathering scoop? LOL  Where does one find those fancy oils?


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STD; Speed Team Doo
'82 Honda 500 APS-AF
'70 Triumph 250 MPS-PG
'71 Triumph 250 APS-PF
'70 Triumph 250 M-PG
JimL
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« Reply #18 on: April 20, 2010, 07:15:23 PM »

I think you'd be wise to install a piston oiler.  Many of the V-twin Hondas have them, to keep the bottom side of the piston crown cooled down.  The wrist pin was lubed by the oil dropped off the ribs, but if the crown temp is high enough to vaporize the oil, there will be no lube on the wrist pin.

The oil squirter cures that AND prevents detonation.  Mine are just small metal tubes with a tiny jet sized orifice, below the bottom of the cylinder liner....hits the bottom of the crown at BDC of the stroke.

Regards, JimL
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wobblywalrus
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« Reply #19 on: April 20, 2010, 11:08:53 PM »

The Triumph has a similar piston pin problem.  Fortunately it was a partial seizure.  The various things I will do to prevent it from happening again are as follows.  1)  teflon coated piston pin  2)  a bronze bushing on the rod small end bearing (dissimilar metals)  3)  honing the bronze bushing to exactly the correct racing clearance.  This is a little bit more than the standard clearance. 

The Triumph has oil squirters under the pistons and they do help.  The extra oil probably kept the partial pin seizure from being a complete disaster.

   
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Bruin
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« Reply #20 on: April 21, 2010, 01:10:00 AM »

Oooo, the squirter sounds interesting. Our team has a couple TR25s that might benefit as well as my Honda.  How expensive and how involved are they to install? Should I just google "Triumph/Honda Piston squirter" or might you have a reliable source you can recommend?  Thanks for the tips.
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STD; Speed Team Doo
'82 Honda 500 APS-AF
'70 Triumph 250 MPS-PG
'71 Triumph 250 APS-PF
'70 Triumph 250 M-PG
JimL
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« Reply #21 on: April 21, 2010, 01:30:14 AM »

I'll take a pic of one of mine, this weekend, and put it on here.  It's just a small metal tube off of an oil line (tube is about 1/8", end smashed shut, top drilled with a hole about .020").  I'm going to rework mine, because they were originally mounted in the primary drive covers, with the tube sticking through a small hole drilled in the side of the main bearing web in the crankcase.

I've made my own primary cover, so I have to change the oiler setup.

More to come,
JimL
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Bruin
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« Reply #22 on: April 24, 2010, 05:36:52 PM »

Here is a piece of advice I got from another site. Whatcha think?

"Drill hole in rocker cover near cam, right side,weld nut in cover,tap tread for oil line screw. Oil line going to clutch cover,drill and tap where oil pressure coming from oil pump in cover. Feeding more oil to the head,that's the way."

I wish he had a picture...
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STD; Speed Team Doo
'82 Honda 500 APS-AF
'70 Triumph 250 MPS-PG
'71 Triumph 250 APS-PF
'70 Triumph 250 M-PG
wobblywalrus
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« Reply #23 on: April 24, 2010, 06:48:40 PM »

The Triumph came from the factory with them installed.  They did the smart thinking, not me.  Tonight I will post something about the pin problem on the team Go Dog Go build diary.
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Bruin
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« Reply #24 on: April 28, 2010, 12:35:58 AM »

I needed to clear the on-deck circle before I could settle into what promises to be extensive rebuilds of the Bonneville racers. But I can report progress has been made. The '70 Triumph B-50 is thumping to beat the band and the '66 BSA Lightning is cracking thunder. Now the real work begins...


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STD; Speed Team Doo
'82 Honda 500 APS-AF
'70 Triumph 250 MPS-PG
'71 Triumph 250 APS-PF
'70 Triumph 250 M-PG
Beairsto Racing
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« Reply #25 on: April 28, 2010, 01:30:19 AM »

Great looking British bikes. cheers
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Sponsored by: Turple Bros., 12 O'Clock Performance,
Palliser Chevrolet, Hose Headquarters, Bentley's Motosicle Pain Tin, Beairsto Trucking
bak189
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« Reply #26 on: April 28, 2010, 10:06:34 AM »

Great looking BSA.......I like the oil-filter........I don't like the carbs........
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Question authority.....always
Bruin
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« Reply #27 on: May 11, 2010, 10:33:54 AM »

Finally got around to swapping out the toasted engine for the spare eBay special. The only problem is that the team's Honda mechanic felt that the spare's connecting rod was a little loose on the crank for stressed running. We'll fire it up and see how much it rattles. I had replaced the old XR engine's reeds with a duckbill collar to help it breath but the spare's head is an XL model built without reeds as part of the intake so maybe it will flow better.


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STD; Speed Team Doo
'82 Honda 500 APS-AF
'70 Triumph 250 MPS-PG
'71 Triumph 250 APS-PF
'70 Triumph 250 M-PG
Bruin
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« Reply #28 on: May 27, 2010, 12:10:52 PM »

The new-old eBay engine was leaking oil like an uncapped sea well. It was hard to tell if it was the gasket, the bolt hole, or a crack. I dusted it with flour and looked for the wet spot. Bingo, it was a hairline crack. It was bigger on the inside than outside. I cut a groove into the crack with a dremil tool and patched it with JB Weld.


* Wet Spot.JPG (124.43 KB, 320x343 - viewed 132 times.)
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STD; Speed Team Doo
'82 Honda 500 APS-AF
'70 Triumph 250 MPS-PG
'71 Triumph 250 APS-PF
'70 Triumph 250 M-PG
fredvance
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« Reply #29 on: May 27, 2010, 12:22:22 PM »

JB weld is good, got some on my cases.
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