Search found 21 matches

by dden
Sun Mar 22, 2015 11:52 am
Forum: Bevel Drive Twins
Topic: An optimistic request!
Replies: 6
Views: 3207

Re: An optimistic request!

I was looking for one for the same reason. I ended up buying an SS dual seat. It needed a little bit of modification but I think it will work. I haven't actually gotten around to do it and probably wont for a while so i'm not 100% sure it works but it might be worth looking into.
by dden
Fri Dec 05, 2014 8:48 pm
Forum: Parallel Twins
Topic: Parallel twin engine parts
Replies: 1
Views: 5519

Parallel twin engine parts

Hi, if anyone needs the following used but good parts let me know: Parts are from a 500SD but may work for GTL models. Pistons Clutch Crankshaft Timing gears Transmission Alternator/ rotor Clutch and timing covers Desmo head Points plate Crank case Cylinder jugs Starter motor Parts are in the USA Th...
by dden
Fri Feb 01, 2013 10:28 am
Forum: Roundcase Engines > 750 GT, 750 Sport & 750 Super Sport
Topic: 74 Gt 750 surging
Replies: 6
Views: 5581

Re: 74 Gt 750 surging

There seems to be a few people having these same problems lately. I think its gas related. Clean your carbs, check floats as mentioned below. I'm wondering if the gas itself is a problem with ethanol in it these days. Maybe try emptying your tank, go through your carbs, and fill it with some race ga...
by dden
Fri Jun 01, 2012 9:29 am
Forum: Electrical & Gauges Shop
Topic: Can MSD coils be used?
Replies: 1
Views: 1303

Can MSD coils be used?

Does anyone think these coils are ok to run as a replacement to the stock coils on a roundcase? I'm going to guess its a no go, since 5 ohm coils are recomended, 3 ohm for racing. They are just compact and i have several of them sitting on my shelf. http://www.msdpowersports.com/Products/Watercraft/...
by dden
Mon Apr 02, 2012 8:19 am
Forum: Wheel, Brake & Tyre Shop
Topic: Problem removing bearing from sproket carrier
Replies: 5
Views: 2539

Re: Problem removing bearing from sproket carrier

Thanks Steve. I actually had trouble with my blind puller, they just were not budging. I had to take the expanding tip of the blind puller and adapt it to a hydraulic press to pull them out. Came out like butter after that. Putting the sprocket carrier bearings back was a real pain too. Pressing one...
by dden
Thu Mar 29, 2012 10:03 pm
Forum: Wheel, Brake & Tyre Shop
Topic: Problem removing bearing from sproket carrier
Replies: 5
Views: 2539

Re: Problem removing bearing from sproket carrier

Got it off, now i just need to figure out the wheel bearings.
by dden
Thu Mar 29, 2012 7:20 pm
Forum: Wheel, Brake & Tyre Shop
Topic: Problem removing bearing from sproket carrier
Replies: 5
Views: 2539

Problem removing bearing from sproket carrier

I was able to remove the bearing and the sleeve they are on from the sproket carrier/Cush Drive and was able to remove one of the bearings from the sleeve. The other one will not budge. It looks like it has a 1/4" inch spacer on one end. This is the bearing on the side of the sleeve that is not thre...
by dden
Fri Mar 23, 2012 9:21 am
Forum: Electrical & Gauges Shop
Topic: '74 Twin electrical testing
Replies: 2
Views: 1679

'74 Twin electrical testing

I've rad a lot about the inadequate electrical on the old twins. @40 years old things have no doubt gotten worse over time. The bike runs but i wanted to go through the system and verify proper operation of the components. (Alternator, regulator, etc... ) I have a multimeter and have been trying to ...
by dden
Wed Mar 21, 2012 11:03 am
Forum: Carburettor & Fuel System Shop
Topic: 74 Sport Carb Jetting
Replies: 5
Views: 2039

Re: 74 Sport Carb Jetting

Runs MUCH better after carb cleaning and change to the main jets. Thanks for the info guys.
by dden
Wed Mar 21, 2012 11:02 am
Forum: Engine & Transmission Shop
Topic: 750 sport compression
Replies: 22
Views: 5603

Re: 750 sport compression

Wow thanks for the excellent information. The left exhaust is in fact the stronger one and the horizontal cylinder is in fact slightly lower on compression. Yes i am using gauges to sync the carbs. I ordered a bunch of shims that should put me in the .1 - .13 clearance range on the intake and .1 - ....
by dden
Tue Mar 20, 2012 1:54 pm
Forum: Engine & Transmission Shop
Topic: 750 sport compression
Replies: 22
Views: 5603

Re: 750 sport compression

Craig, what engine were you shimming? What specs do you use on clearances. I have another thread for valve clearances but no replies yet. Too much varying info out there to make a determination.

-Dan
by dden
Tue Mar 20, 2012 9:22 am
Forum: Engine & Transmission Shop
Topic: 750 sport compression
Replies: 22
Views: 5603

Re: 750 sport compression

I thought i have one cylinder weaker than the other. I noticed when tuning the carbs and holding my hand near the exhaust (one strong, one weak). At this point i am chalking it up to possible valve clearance out of spec + weak battery (not so good spark) and points not set perfectly. I didn't have t...
by dden
Mon Mar 19, 2012 9:04 am
Forum: Engine & Transmission Shop
Topic: 750 sport compression
Replies: 22
Views: 5603

Re: 750 sport compression

I thought many other things went into figuring out what compression numbers should be. For instance valve timing, or is everything already figured into the compression ratio figure?

I'm seeing higher than 120psi-135psi... I'll have to do the test again.
by dden
Sun Mar 18, 2012 2:43 pm
Forum: Engine & Transmission Shop
Topic: 750 sport compression
Replies: 22
Views: 5603

Re: 750 sport compression

Thanks Craig, I was looking for kicking compression. Wondering what i should be getting on compression gunge.
by dden
Sun Mar 18, 2012 10:53 am
Forum: Engine & Transmission Shop
Topic: 750 sport compression
Replies: 22
Views: 5603

750 sport compression

Are there any known compression figures for 750 sports?

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