TRIUMPH T20 CUB - MODIFIED

[Old Scrambler]

Thanks, Astek..............Packing the trailer with plans to leave on Wednesday for arrival on Friday.

Bo........I'll try to take some notes for you

[Old Scrambler]

Success Well, sort-of...............My 750cc sohc Honda-four got me a record in Modified Partial Streamlined Classic Gas at 137.699 mph...........top speed was 140-mph on a separate run but my battery failed and I could not back it up :x  Without the fairing I also upped the record by 5-mph to 130-mph

The Triumph ran into wire-harness failure so I parked it and went home a day early to catch the Chief Blackhawk AMCA meet in Davenport Iowa. 

[wobblywalrus]

That reads like success.  Two records.  Good job.

[Bruin]

Sounds speedy. Sorry I missed you. Do you run a total loss electrical system, battery without the drag of a generator?

[Old Scrambler]

Total loss L-I unit...............When fully charged its good for 4 runs on the International course. I could have idled home on the battery, but not enough juice for full noise on the 5th run. I use a Deltron (Battery Tender) unit and like the 4-post design and that it does not require a special charger.

[Bruin]

I'm looking at dropping my tank to the floor so it will need a fuel pump. The fuel pump I have on hand is a 12v model and the bike is CDI with 6 v for lights. So a total loss 12v battery will power the pump. I think the pump draws 3 amps so a 15 amp hour battery should run 5 hours-ish. I figured I carry a spare battery. I have found a solar powered trickle charger and I thought that might keep it topped off when not running at sunny Bonneville.

[Old Scrambler]

We have a solar unit for the daytime, and a standard charger in hotel-room for when I REMEMBER to bring the battery with me

I see several riders using a modern Suzuki fuel pump for its low-amperage and sufficient volume without 'blowing' the fuel-lines.

[Old Scrambler]

So we got the motor on the CB750 together and gave it a trial run. All is good with no apparent damage to any components after our record runs 8-) 8-) 8-)  Plans are to fashion a new and improved tail-section to 'close the hole' more effectively. While that is being accomplished, Carol and I have decided to do some traveling to see some far-away places. Our first trip was to visit several national parks in California and Utah. Upon our return to Plymouth, (sold our house and moved to an apartment) the mail-lady brought me a letter from our State Governor. He was congratulating me for setting records at Bonneville..........Wow.....it must have been a slow news-day for him to do that :lol: :lol:..........but I do know that he occasionally rides a bike 8-) 8-)

A few short trips are planned to visit our daughters and then..............we hope to travel with our RV to Alaska for several months in 2017. We will tow a trailer containing a UTV and a bike. One of many things on my 'bucket-list' is to ride the Haul Road to take a swim in the Arctic Ocean. If we like what we are doing, we may not be back to the salt until 2018. But the bikes will be ready, just in case

[Old Scrambler]

Its been a while........Left the Triumph home.......Concentrated on the Honda in the Classic competition. Set 4 records including a top speed of 147.8 in the MPS-CG 750cc @ 143.005..........M-CF @ 139.85..........MPS-CF @ 144.2025.........M-CG @ 136.62

It was a great event with hard salt............My motor seems to be gaining power..........it sounds angry and the rings have finally seated I feel a 150+ run is possible...........

[Old Scrambler]

Well...........the rings are seated but a few wear items caused a bit of stress..........the primary chain tensioner stopped rolling resulting in chaff rubbed off into the sump which almost blocked the screen to the oil pump ...........I noticed the oil pressure drop from 80 to 60 on the last run and called it quits. One rod bearing shows the very beginning of wear so new will be installed in all.........most alarming is apparent rod-stretch causing the pistons to brush against the edge of the chamber.......mild machining will be required, but no damage to the pistons.....there bottoms look like new The rods will be replaced.

The primary chains are stretched and will be replaced with heavy-duty coated units.......the cam-chain is good but the tensioner will be replaced with an upgraded unit. Plans are to return for more speed in 2019

[wobblywalrus]

In the old days the cam chains and tensioners were replaced for every race.  This was for road racing on tracks like Sears Point in California.  They are a weak part of the design.  There were no problems with either is if this was done.

[Old Scrambler]

I checked the chains and tensioners before were reassembled the motor........and again after a short dyno-run. The primary tensioner was the culprit. More attention will be paid to these items as we go forward. While the motor is apart, we will change the 5th-gear ratio to be less of an overdrive, as well as install an adjustable cam-sprocket to fine-tune the valve timing.