Subject: VHB converson info request
Author: joe jump
Date: Jun 4, 2001, 7:33 AM
Post ID: 1706981634
Finally, I have something on topic to talk about!
Yesterday I took in a V7 for some electrical work (handlebar switches,
warning lights, etc). The owner pointed out that the original SS-1 carbs
have been replaced with 30mm VHBs from an 850T, along with the intake
manifolds. I asked him how it ran and he said "not too good". I remember
reading in Greg Fields book, "Moto Guzzi Big Twins" about the early bikes
having a problem with eating the throttle, which was corrected by the
installation of a bushing in the intake port that would shrink the intake
port diameter and improve low speed throttle response. I doubt if those
bushings are still in this engine, but I haven't looked yet.
I am looking for advice from those who have converted from SS-1 carbs
to VHBs. Any tips would be appreciated-Thanks!
Joe in St Louis
| From: joe jump <jum-@hotmail.com> Reply-To: Loopfram-@topica.com To: Loopfram-@topica.com Subject: Clutch springs Date: Wed, 30 May 2001 17:30:55 ============================================================ Win $50,000 - from Monstermoving.com! You could win a whole year's worth of living expenses. Lots of great weekly prizes, too. Enter now and win! http://click.topica.com/caaabV8b1dfltb2DTzja/MonsterMoving ============================================================ Just went through the drill on a V7 Sport and an 850T. I believe construction to be identical. My Sport had a slipping clutch, caused by gear oil migrating up the clutch push rod. I replaced the friction plates, springs (cheap), and the clutch pushrod seals, along with engine rear main & transmission input seal/O-rings. The hub looked to have minimal wear so did not replace. Very lightly lubed splines on hub, friction plates, intermediate plate & flywheel with BMW spline grease, after cleaning all parts spotless. Put it all back together following instructions in shop manual & verified with Chilton, using Guzzi factory clutch spring compresor. Clutch no longer slipped but would not disengage cleanly. Took it apart again searching for the problem. Ultimately, I think my problem was that not all 8 of the clutch springs were seated in the spring pockets in the pressure plate. On my machine, the punch mark on the spline of the pressure plate will not align perfectly with the arrow on the outside edge of the flywheel, so the pressure plate can be installed in two positions and be alligned equal amounts off from "dead nuts". This could have been a contributor. But the pockets on the pressure plate are dimensioned pretty tight to the OD of the clutch springs (tighter than those in the flywheel), and it seemed that I wasn't getting them all seated correctly. I tried numerous attempts at assmbling, but I think I got it right by fitting the springs into the pressure plate first, then mating the pressure plate to the flywheel. Another contributing factor may have been that the replacement friction plates (new, not reconditioned) were a sloppier fit on the hub than the oil soaked used plates that I had replaced. I decided to either clean up and reuse my old plates, or replace the (almost) new 2mm spline friction plates & the old hub with new 4mm plates & hub. To MGs credit, they swapped plates (no charge) and sold me a new 4mm hub at a good price. The friction plates are Sureflex, and the splines are a snug , free running fit on the hub. These are the same parts I put in the 850T and quality was the same. Only thing I can envision destroying the throwout bearing is incorrect assembly-sorry, no help there. To summarize, slipping clutch is probably caused from oil-contaminated plates or extreemly weak springs. Clutch drag is caused by pressure plate not lifting squarely (springs not located correctly) or notchy clutch hub/loose spline fit. Can't help with the throw out bearing other than improper assembly. Good Luck! _________________________________________________________________ Get your FREE download of MSN Explorer athttp://explorer.msn.com ============================================================ Want to save a fortune? It's fast, easy, and fun with outrageous deals from TopOffers. http://click.topica.com/caaacgJb1dfltb2DTzjf/TopOffers ============================================================ |
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